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Journal articles on the topic 'Retention models in RPLC'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

Peris-García, Ester, María José Ruiz-Angel, Juan José Baeza-Baeza, and María Celia García-Alvarez-Coque. "Comparison of the Fitting Performance of Retention Models and Elution Strength Behaviour in Hydrophilic-Interaction and Reversed-Phase Liquid Chromatography." Separations 8, no. 4 (April 20, 2021): 54. http://dx.doi.org/10.3390/separations8040054.

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Hydrophilic interaction liquid chromatography (HILIC) is able to separate from polar to highly polar solutes, using similar eluents to those in the reversed-phase mode (RPLC) and a polar stationary phase, where water is adsorbed onto its surface. It is widely accepted that multiple modes of interaction take place in the HILIC environment, which can be far more complex than the interactions in an RPLC column. The behaviour in HILIC should be adequately modelled to predict the retention with optimisation purposes and improve the understanding on retention mechanisms, as is the case for RPLC. In this work, the prediction performance of several retention models is studied for seven HILIC columns (underivatised silica, and silica containing diol, amino and sulfobetaine functional groups, together with three columns recently manufactured with neutral, anionic, and cationic character), using uracil and six polar nucleosides (adenosine, cytidine, guanosine, thymidine, uridine, and xanthosine) as probe compounds. The results in HILIC are compared with those that were offered by the elution of several polar sulphonamides and diuretics analysed with two C18 columns (Chromolith Speed ROD and Zorbax Eclipse XDB). It is shown that eight retention models, which only consider partitioning or both partitioning and adsorption, give similar good accuracy in predictions for both HILIC and RPLC columns. However, the study on the elution strength behaviour, at varying mobile phase composition, reveals similarities (or differences) between RPLC and HILIC columns of diverse nature. The particular behaviour for the HILIC and RPLC columns was also revealed when the retention, in both modes, was fitted to a model that describes the change in the elution strength with the modifier concentration.

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2

Jouyban, Abolghasem, Somaieh Soltani, Anahita Fathi-Azarbaijani, and William E. Acree Jr. "Modeling the retention behavior of analytes in RPLC with mixed solvent mobile phases using Jouyban-Acree and Abraham models." Analytical Methods 2, no. 9 (2010): 1286. http://dx.doi.org/10.1039/c0ay00254b.

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3

Acanski, Marijana, and Tatjana Djakovic-Sekulic. "Correlation between retention constants obtained in reversed-phase liquid chromatography and partition coefficients of some benzimidazole derivatives." Acta Periodica Technologica, no. 35 (2004): 165–77. http://dx.doi.org/10.2298/apt0435165a.

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Several calculation procedures for log P values based on the fragmental and atomic contributions are compared with experimental reversed-phase liquid chromatography (RPLC) retention constants of benzimidazole derivatives. The RPLC experiments were performed on HPLC comerrcially available LiChrosorb RP(-18 column with binary solvent mixtures of methanol-phosphate buffer (pH 7) as mobile phase. Retention constant log k0 was determined by the extrapolation method. Good correlaton was found between the retention constants log k0 and log P, as well as m and log P of the compounds investigated.

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4

Singer, Eris, and H. J. Möckel. "RPLC retention of 1,ω-di(alkoxy)-polysulphides." Chromatographia 27, no. 1-2 (January 1989): 27–30. http://dx.doi.org/10.1007/bf02290400.

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5

Peris-García, Ester, Raquel Burgos-Gil, María Celia García-Alvarez-Coque, and María José Ruiz-Angel. "Hydrophilic Liquid Chromatography versus Reversed-Phase Liquid Chromatography in the Absence and the Presence of 1-Hexyl-3-methylimidazolium Chloride for the Analysis of Basic Compounds." Separations 7, no. 2 (May 29, 2020): 30. http://dx.doi.org/10.3390/separations7020030.

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In reversed-phase liquid chromatography (RPLC), positively charged basic compounds yield broad and asymmetric peaks, as a result of ionic interactions with free silanols that remain on conventional silica-based columns. Diverse solutions have been proposed to mask the silanophilic activity, which is translated to an improved peak shape. In this work, the chromatographic performance of hydrophilic interaction liquid chromatography (HILIC) was evaluated as an alternative to the addition of an ionic liquid (IL) to the aqueous-organic mobile phase used with RPLC columns, for the analysis of eight β-adrenoceptor antagonists. ILs change the behavior of RPLC stationary phases owing to adsorption on their surface. Meanwhile, in HILIC, a layer of adsorbed water is formed on the stationary phase surface. The association of cationic basic compounds with the adsorbed additive ions, hydrophilic partitioning on the HILIC columns, and other interactions, give rise to complex retention mechanisms. The chromatographic behavior was examined in terms of retention, elution strength, selectivity, peak shape and resolution, using acetonitrile-water mobile phases buffered at pH 3. Both chromatographic modes, RPLC with added IL and HILIC, proved to be a viable solution to the problem of poor peak shape for basic compounds.

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6

El Hage, Krystel, Raymond J. Bemish, and Markus Meuwly. "From in silica to in silico: retention thermodynamics at solid–liquid interfaces." Physical Chemistry Chemical Physics 20, no. 27 (2018): 18610–22. http://dx.doi.org/10.1039/c8cp02899k.

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7

Singer, Eris, and H. J. Möckel. "RPLC Retention of Oxygen Containing Non-Ionic Organic Sulfur Compounds." Journal of Liquid Chromatography 13, no. 8 (April 1990): 1499–516. http://dx.doi.org/10.1080/01483919008048972.

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8

Chen, Fang-yuan, Xiao-wen Cao, Shu-ying Han, Hong-zhen Lian, and Li Mao. "RELATIONSHIP BETWEEN HYDROPHOBICITY AND RPLC RETENTION BEHAVIOR OF AMPHOTERIC COMPOUNDS." Journal of Liquid Chromatography & Related Technologies 37, no. 18 (May 20, 2014): 2711–24. http://dx.doi.org/10.1080/10826076.2013.864977.

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9

Wang, F. A., J. C. Song, Y. H. Wang, Y. Zhao, and T. Z. Cao. "Relationship Between Retention and Homologous Factor of Homologues in RPLC." Microchemical Journal 52, no. 2 (October 1995): 194–99. http://dx.doi.org/10.1006/mchj.1995.1085.

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10

Luo, Haibin, and Yuen-Kit Cheng. "Quantitative Structure-Retention Relationship of Nucleic-Acid Bases Revisited. CoMFA on Purine RPLC Retention." QSAR & Combinatorial Science 24, no. 8 (October 2005): 968–75. http://dx.doi.org/10.1002/qsar.200530130.

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11

Pirttilä, Kristian, Göran Laurell, Curt Pettersson, and Mikael Hedeland. "Automated Sequential Analysis of Hydrophilic and Lipophilic Fractions of Biological Samples: Increasing Single-Injection Chemical Coverage in Untargeted Metabolomics." Metabolites 11, no. 5 (May 5, 2021): 295. http://dx.doi.org/10.3390/metabo11050295.

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In order to increase metabolite coverage in LC–MS-based untargeted metabolomics, HILIC- and RPLC-mode separations are often combined. Unfortunately, these two techniques pose opposite requirements on sample composition, necessitating either dual sample preparations, increasing needed sample volume, or manipulation of the samples after the first analysis, potentially leading to loss of analytes. When sample material is precious, the number of analyses that can be performed is limited. To that end, an automated single-injection LC–MS method for sequential analysis of both the hydrophilic and lipophilic fractions of biological samples is described. Early eluting compounds in a HILIC separation are collected on a trap column and subsequently analyzed in the RPLC mode. The instrument configuration, composed of commercially available components, allows easy modulation of the dilution ratio of the collected effluent, with sufficient dilution to obtain peak compression in the RPLC column. Furthermore, the method is validated and shown to be fit for purpose for application in untargeted metabolomics. Repeatability in both retention times and peak areas was excellent across over 140 injections of protein-precipitated blood plasma. Finally, the method has been applied to the analysis of real perilymph samples collected in a guinea pig model. The QC sample injections clustered tightly in the PCA scores plot and showed a high repeatability in both retention times and peak areas for selected compounds.

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12

Chowdhury, M. A. Jamil, H. Ihara, T. Sagawa, and C. Hirayama. "RETENTION BEHAVIORS OF POLYCYCLIC AROMATIC HYDROCARBONS ON COMB-SHAPED POLYMER IMMOBILIZED-SILICA IN RPLC." Journal of Liquid Chromatography & Related Technologies 23, no. 15 (September 13, 2000): 2289–302. http://dx.doi.org/10.1081/jlc-100100488.

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13

Vít, Ivan, Jan Fähnrich, and Milan Popl. "Determination of the dead volume of columns in reversed phase liquid chromatography." Collection of Czechoslovak Chemical Communications 54, no. 4 (1989): 953–66. http://dx.doi.org/10.1135/cccc19890953.

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The method for the determination of the dead volume of RPLC columns by measuring the retention volume of phloroglucinol is compared with the method based on the retention data of homologous series of organic solutes and that based on the use of isotopically labelled components of the mobile phase. The use of homologous series is tedious and moreover, satisfactory results are not always obtained. The phloroglucinol method is found well suited to replacing the method based on the use of isotopically labelled components of the mobile phase; poorer results with phloroglucinol are only obtained when the mobile phase contains more than 40% (v/v) water, for the Separon SE polymeric sorbent, and in alkaline medium.

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14

Zanella-Cleon, Isabelle, Michel Becchi, Philippe Lacan, Piero C. Giordano, Henri Wajcman, and Alain Francina. "Detection of a Thalassemic α-Chain Variant (Hemoglobin Groene Hart) by Reversed-Phase Liquid Chromatography." Clinical Chemistry 54, no. 6 (June 1, 2008): 1053–59. http://dx.doi.org/10.1373/clinchem.2007.097857.

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Abstract Background: Hemoglobin (Hb) Groene Hart [α119 (H2)Pro→Ser (α1)], also known as Hb Bernalda, is a nondeletional α-thalassemic Hb variant that is frequent in southern Italy and North Africa. This variant is not supposed to be produced in the erythrocytes of carriers. The α-thalassemic behavior of this variant has been explained as an impaired interaction between the α-globin chain and the α-Hb–stabilizing protein. Methods: To separate globin chains, we developed a modified reversed-phase liquid chromatography (RPLC) procedure that uses acetonitrile–water solvents containing up to 3 mL/L trifluoroacetic acid. After RPLC, we characterized the isolated globin chains by electrospray ionization (ESI) mass spectrometry (MS) and analyzed their tryptic peptides with matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) MS and nano-LC–ESI–MS/MS. Results: RPLC detected an abnormal peak with a retention time substantially greater than that of the wild-type αA-globin chain. We identified this variant as Hb Groene Hart and found it in the hemolysates of 11 unrelated patients (1 homozygote, 9 heterozygotes, and 1 heterozygote associated with the −α3.7 deletion). These patients possessed abnormal hematologic features suggesting an α-thalassemia phenotype. Molecular modeling suggested that the increase in hydrophobicity was due to opening of the GH interhelical segment following replacement of amino acid residue 119 with a nonhelix breaker residue. Conclusions: This method allows the detection of Hb variants at low concentrations, and adjusting the composition of the organic solvents enables the method to identify Hb variants with large changes in hydrophobicity.

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15

Samuelsson, Jörgen, Finnur Freyr Eiriksson, Dennis Åsberg, Margrét Thorsteinsdóttir, and Torgny Fornstedt. "Determining gradient conditions for peptide purification in RPLC with machine-learning-based retention time predictions." Journal of Chromatography A 1598 (August 2019): 92–100. http://dx.doi.org/10.1016/j.chroma.2019.03.043.

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16

Guillaume, Yves Claude, and Christiane Guinchard. "ACN Clusters in a Water/ACN Mixture, with Implications for the RPLC Weak Polar Solute Retention." Analytical Chemistry 69, no. 2 (January 1997): 183–89. http://dx.doi.org/10.1021/ac960679i.

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17

Sun, Z. L., L. J. Song, X. T. Zhang, J. Huang, M. L. Li, J. E. Bai, and Z. D. Hu. "Relationship Between Retention Behavior of Substituted Benzene Derivatives and Properties of the Mobile Phase in RPLC." Journal of Chromatographic Science 35, no. 3 (March 1, 1997): 105–16. http://dx.doi.org/10.1093/chromsci/35.3.105.

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18

Yuan, Na, Shu-ying Han, Jing Yang, Jun-qin Qiao, Yang Liu, and Hong-Zhen Lian. "Study on Retention Behaviour of Homo-Oligonucleotides in IP-RPLC Using Dual-Point Retention Time Correction on “Standard Column” with Internal Standards." Current Analytical Chemistry 8, no. 4 (August 1, 2012): 550–56. http://dx.doi.org/10.2174/157341112803216825.

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19

Guttman, Irwin, and Ingram Olkin. "Retention or Attrition Models." Journal of Educational Statistics 14, no. 1 (March 1989): 1–20. http://dx.doi.org/10.3102/10769986014001001.

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A model for retention and its counterpart, attrition, is presented. In a prototype example, students enter a program in each of k terms; some of the students complete the program, and the remainder leave. A key feature in the models proposed is that there is a dampening effect from term to term because the probability of leaving the program diminishes as the terms progress. The focus of this paper is the study of alternative models for the dampening in attrition rates. A number of alternative dampening effects are proposed that provide for different rates of attrition. Approximate maximum likelihood estimates for the underlying parameters in each model and a Bayesian analysis are provided.

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20

Guttman, Irwin, and Ingram Olkin. "Retention or Attrition Models." Journal of Educational Statistics 14, no. 1 (1989): 1. http://dx.doi.org/10.2307/1164722.

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21

Gupta, Deepak Kumar, Gary Chi Ying Ding, Yong Chua Teo, and Lik Tong Tan. "Absolute Stereochemistry of the β-Hydroxy Acid Unit in Hantupeptins and Trungapeptins." Natural Product Communications 11, no. 1 (January 2016): 1934578X1601100. http://dx.doi.org/10.1177/1934578x1601100120.

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The β-hydroxy/amino acid unit is a common structural feature of many bioactive marine cyanobacterial depsipeptides. In this study, the absolute stereochemistry of the β-hydroxy acid moieties in hantupeptins and trungapeptins were determined through their synthesis and HPLC analysis of the Mosher ester derivatives. Synthesis of two3-hydroxy-2-methyloctanoic acid (Hmoa) stereoisomers, (2 S,3 R)-Hmoa and (2 S,3 S)-Hmoa, were achieved using diastereoselective asymmetric method and the retention times of all four Hmoa isomers were established indirectly by RPLC-MS analysis of their Mosher ester derivative standards. Based on the retention times of the standards, the absolute configuration of the Hmoa unit in hantupeptin C (3) and trungapeptin C (6) was assigned as (2 R,3 S)- and (2 S,3 R)-Hmoa, respectively. The use of the Mosher's reagents, coupled with HPLC analysis, provided a viable alternative to the absolute stereochemical determination of β-hydroxy acid units in depsipeptides.

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22

Sun, Z. L., L. J. Song, X. T. Zhang, and Z. D. Hu. "Study on the relationship between retention behavior and molecular structure parameters of substituted benzene derivatives in RPLC." Chromatographia 42, no. 1-2 (January 1996): 43–48. http://dx.doi.org/10.1007/bf02271054.

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23

Morin, N., Y. C. Guillaume, and J. C. Rouland. "A simple model for RPLC retention and selectivity of imidazole enantiomers using β-cyclodextrin as chiral selector." Chromatographia 48, no. 5-6 (September 1998): 388–94. http://dx.doi.org/10.1007/bf02467709.

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24

Stella, Cinzia, Alexandra Galland, Xiangli Liu, Bernard Testa, Serge Rudaz, Jean-Luc Veuthey, and Pierre-Alain Carrupt. "Novel RPLC stationary phases for lipophilicity measurement: Solvatochromic analysis of retention mechanisms for neutral and basic compounds." Journal of Separation Science 28, no. 17 (November 2005): 2350–62. http://dx.doi.org/10.1002/jssc.200500104.

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25

Li, Min, Yongjun Lu, Yicong Yang, Jianjun Li, Lili Wang, Wei Tuo, Xiaohui Ning, and Xin-Du Geng. "Steady-migration retention characteristics of peptides under gradient elution: application towards a dynamic separation method for minor-adjustments of the retention of peptides in RPLC." Science China Chemistry 60, no. 6 (December 12, 2016): 829–36. http://dx.doi.org/10.1007/s11426-016-0318-2.

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26

Du, Hongying, Jie Wang, Xiaoyun Zhang, Xiaojun Yao, and Zhide Hu. "Prediction of retention times of peptides in RPLC by using radial basis function neural networks and projection pursuit regression." Chemometrics and Intelligent Laboratory Systems 92, no. 1 (May 2008): 92–99. http://dx.doi.org/10.1016/j.chemolab.2007.12.005.

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27

Gagliardi, Leonardo G., Cecilia B. Castells, Clara Ràfols, Martí Rosés, and Elisabeth Bosch. "Effect of temperature on the chromatographic retention of ionizable compounds. III. Modeling retention of pharmaceuticals as a function of eluent pH and column temperature in RPLC." Journal of Separation Science 31, no. 6-7 (April 2008): 969–80. http://dx.doi.org/10.1002/jssc.200700491.

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28

Jandera, Pavel, Tomáš Hájek, and Marie Růžičková. "Retention Models on Core–Shell Columns." Journal of AOAC INTERNATIONAL 100, no. 6 (November 1, 2017): 1636–46. http://dx.doi.org/10.5740/jaoacint.17-0233.

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Abstract A thin, active shell layer on core–shell columns provides high efficiency in HPLC at moderately high pressures. We revisited three models of mobile phase effects on retention for core–shell columns in mixed aqueous–organic mobile phases: linear solvent strength and Snyder–Soczewiński two-parameter models and a three-parameter model. For some compounds, two-parameter models show minor deviations from linearity due to neglect of possible minor retention in pure weak solvent, which is compensated for in the three-parameter model, which does not explicitly assume either the adsorption or the partition retention mechanism in normal- or reversed-phase systems. The model retention equation can be formulated as a function of solute retention factors of nonionic compounds in pure organic solvent and in pure water (or aqueous buffer) and of the volume fraction of an either aqueous or organic solvent component in a two-component mobile phase. With core–shell columns, the impervious solid core does not participate in the retention process. Hence, the thermodynamic retention factors, defined as the ratio of the mass of the analyte mass contained in the stationary phase to its mass in the mobile phase in the column, should not include the particle core volume. The values of the thermodynamic factors are lower than the retention factors determined using a convention including the inert core in the stationary phase. However, both conventions produce correct results if consistently used to predict the effects of changing mobile phase composition on retention. We compared three types of core–shell columns with C18-, phenyl-hexyl-, and biphenyl-bonded phases. The core–shell columns with phenyl-hexyl- and biphenyl-bonded ligands provided lower errors in two-parameter model predictions for alkylbenzenes, phenolic acids, and flavonoid compounds in comparison with C18-bonded ligands.

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29

Ståhlberg, Jan. "Retention models for ions in chromatography." Journal of Chromatography A 855, no. 1 (September 1999): 3–55. http://dx.doi.org/10.1016/s0021-9673(99)00176-4.

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30

Forster, WA, MO Kimberley, KD Steele, MR Haslett, JA Zabkiewicz, and SW Dean. "Spray Retention Models for Arable Crops." Journal of ASTM International 3, no. 6 (2006): 13528. http://dx.doi.org/10.1520/jai13528.

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31

Castello, G., P. Moretti, and S. Vezzani. "Retention models for programmed gas chromatography." Journal of Chromatography A 1216, no. 10 (March 2009): 1607–23. http://dx.doi.org/10.1016/j.chroma.2008.11.049.

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32

Bashir, Mubasher A., and Wolfgang Radke. "Comparison of retention models for polymers." Journal of Chromatography A 1131, no. 1-2 (October 2006): 130–41. http://dx.doi.org/10.1016/j.chroma.2006.07.089.

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33

Akapo, S. O., and C. F. Simpson. "Influence of temperature and mobile phase composition on retention properties of oligomeric bonded phases in reversed-phase liquid chromatography (RPLC)." Chromatographia 44, no. 3-4 (February 1997): 135–44. http://dx.doi.org/10.1007/bf02466447.

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34

Park, J. H., Y. K. Ryu, H. J. Lim, H. S. Lee, J. K. Park, Y. K. Lee, M. D. Jang, J. K. Suh, and P. W. Carr. "Effect of triethylamine in the mobile phase on the retention properties of conventional polymeric and horizontally polymerized octadecylsilica in RPLC." Chromatographia 49, no. 11-12 (June 1999): 635–42. http://dx.doi.org/10.1007/bf02466905.

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35

Kwietniewski, Ludomir. "DETERMINATION OF SOLUTE RETENTION FACTORS IN RPLC WITH PURE WATER AS EFFLUENT USING A NUMERICAL METHOD BASED ON THE OŚCIK'S EQUATION." Journal of Liquid Chromatography & Related Technologies 33, no. 3 (January 27, 2010): 305–23. http://dx.doi.org/10.1080/10826070903524076.

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36

Sokolowski, A. "Zone formation in ion-pair RPLC II. System peak retention and effects of desorption of organic ions on established column equilibria." Chromatographia 22, no. 1-6 (June 1986): 177–82. http://dx.doi.org/10.1007/bf02257322.

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37

Larbi, Hassina, Linda Didaoui, and Michel Righezza. "Characterization of stationary phases based on monosubstituted benzene retention indices using correspondence factor analysis and linear solvation energy relationships in RPLC." Journal of the Iranian Chemical Society 15, no. 10 (June 11, 2018): 2295–305. http://dx.doi.org/10.1007/s13738-018-1418-8.

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38

BIRD, N. R. A., F. BARTOLI, and A. R. DEXTER. "Water retention models for fractal soil structures." European Journal of Soil Science 47, no. 1 (March 1996): 1–6. http://dx.doi.org/10.1111/j.1365-2389.1996.tb01365.x.

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39

Vahedifard, Farshid, Toan Duc Cao, Sannith Kumar Thota, and Ehsan Ghazanfari. "Nonisothermal Models for Soil–Water Retention Curve." Journal of Geotechnical and Geoenvironmental Engineering 144, no. 9 (September 2018): 04018061. http://dx.doi.org/10.1061/(asce)gt.1943-5606.0001939.

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40

Richardson, C. J., S. Qian, C. B. Craft, and R. G. Qualls. "Predictive models for phosphorus retention in wetlands." Wetlands Ecology and Management 4, no. 3 (September 1996): 159–75. http://dx.doi.org/10.1007/bf01879235.

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41

de Voogt, P., J. W. M. Wegener, U. A. Th Brinkman, and H. Govers. "Retention of neutral and basic heteroaromatic hydrocarbons in RPLC systems and its use in predictive studies I. Concentration of the organic modifier." Science of The Total Environment 109-110 (December 1991): 69–87. http://dx.doi.org/10.1016/0048-9697(91)90171-a.

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42

Guillaume, Y. C., E. Peyrin, A. Villet, A. Nicolas, C. Guinchard, J. Millet, and J. F. Robert. "Use of the Na+ ion as an RPLC retention marker to investigate the association of dansyl amino acids with permethylated β-CD." Chromatographia 52, no. 11-12 (December 2000): 753–57. http://dx.doi.org/10.1007/bf02491001.

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43

Marchetti, Nicola, and Georges Guiochon. "Separation of Peptides from Myoglobin Enzymatic Digests by RPLC. Influence of the Mobile-Phase Composition and the Pressure on the Retention and Separation." Analytical Chemistry 77, no. 11 (June 2005): 3425–30. http://dx.doi.org/10.1021/ac050541c.

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44

Bodzioch, Karolina, Bieke Dejaegher, Tomasz Baczek, Roman Kaliszan, and Yvan Vander Heyden. "Evaluation of a generalized use of the log Sum(k+1)AAdescriptor in a QSRR model to predict peptide retention on RPLC systems." Journal of Separation Science 32, no. 12 (June 2009): 2075–83. http://dx.doi.org/10.1002/jssc.200900030.

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45

Sysuev, V. A., I. I. Maksimov, V. V. Alekseev, and V. I. Maksimov. "Soil water retention curves based on idealized models." Russian Agricultural Sciences 39, no. 5-6 (September 2013): 522–25. http://dx.doi.org/10.3103/s1068367413060219.

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46

Forster, W. A., K. D. Steele, R. E. Gaskin, and J. A. Zabkiewicz. "Spray retention models for vegetable crops preliminary investigation." New Zealand Plant Protection 57 (August 1, 2004): 260–65. http://dx.doi.org/10.30843/nzpp.2004.57.6904.

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This study tests the most appropriate of three mathematical models for spray retention by plant foliage The current study utilised two plant species potato (easy to wet with relatively horizontal leaves) and onion (difficult to wet with relatively vertical foliage) Formulations providing a range of dynamic surface tensions (2673 mN/m) were used at two nominal spray volumes (200 and 500 litres/ha) The model by Grayson et al (1993) worked reasonably well with the current data However to be truly predictive extensive revision is required and recommendations for this are outlined

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47

Stangeby, P. C., and J. D. Elder. "Impurity retention by divertors. I. One dimensional models." Nuclear Fusion 35, no. 11 (November 1995): 1391–412. http://dx.doi.org/10.1088/0029-5515/35/11/i06.

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48

Koekkoek, E. J. W., and H. Booltink. "Neural network models to predict soil water retention." European Journal of Soil Science 50, no. 3 (September 1999): 489–95. http://dx.doi.org/10.1046/j.1365-2389.1999.00247.x.

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Plank, Dave. "Creative Staffing Models for Recruitment and Retention Challenges." AORN Journal 109, no. 5 (April 26, 2019): 568–71. http://dx.doi.org/10.1002/aorn.12670.

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Andries, Jan P. M., Mohammad Goodarzi, and Yvan Vander Heyden. "Improvement of quantitative structure–retention relationship models for chromatographic retention prediction of peptides applying individual local partial least squares models." Talanta 219 (November 2020): 121266. http://dx.doi.org/10.1016/j.talanta.2020.121266.

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