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首页> 外文期刊>Journal of chromatography, A: Including electrophoresis and other separation methods >Use of temperature programming to improve resolution of inorganic anions, haloacetic acids and oxyhalides in drinking water by suppressed ion chromatography
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Use of temperature programming to improve resolution of inorganic anions, haloacetic acids and oxyhalides in drinking water by suppressed ion chromatography

机译：使用温度程序设计通过抑制离子色谱法提高饮用水中无机阴离子，卤乙酸和卤氧化物的分辨率

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Temperature programming was used to improve selectivity in the suppressed ion chromatographic (IQ separation of inorganic anions, haloacetic acids and oxyhalides in drinking water samples when using NaOH gradient elution. The programme exploited varying responses of these anions to changes in temperature. Heats of adsorption (Delta H, kJ/mol) for 17 anionic species were calculated from van't Hoff plots. For haloacetic acids, both the degree of substitution and log P (log of n-octanol-water partition coefficient) values correlated well with the magnitude of the temperature effect, with monochloro- and monobromoacetic acids showing the largest effect (Delta H = -10.4 to -10.7 kJ/mol), dichloro-and dibromoacetic acids showing a reduced effect (Delta H= -6.8 to -8.4 kJ/mol) and trichloro-, bromodichloro- and chlorodibromoacetic acids showing the least effect (Delta H = -4.7 to -2.4 kJ/mol). The effect of temperature on oxyhalides ranged from Delta H = 8.4 kJ/mol for perchlorate to Delta H = -9.1 kJ/mol for iodate. The effectiveness of two commercial column ovens was investigated for the application of temperature gradients during chromatographic runs, with the best system applied to improve the resolution of closely retained species at the start, middle and end of the, separation obtained using a previously optimised hydroxide gradient, in a real drinking water sample matrix. Retention time reproducibility of the final method ranged from 0.62 to 3.18 % RSD (n = 30) showing temperature programming is indeed a practically important parameter to manipulate resolution. (c) 2005 Elsevier B.V. All rights reserved.
机译：使用温度程序设计可提高抑制离子色谱的选择性（使用NaOH梯度洗脱对饮用水样品中的无机阴离子，卤乙酸和卤氧化物进行IQ分离。该程序利用了这些阴离子对温度变化的变化响应。根据van't Hoff图计算出17种阴离子物质的Delta H，kJ / mol），对于卤代乙酸，取代度和log P（正辛醇-水分配系数的log）值均与ΔH的大小相关。温度效应，一氯乙酸和一溴乙酸显示出最大的影响（ΔH = -10.4至-10.7 kJ / mol），二氯和二溴乙酸显示出减小的影响（ΔH = -6.8至-8.4 kJ / mol）以及三氯，溴二氯和氯二溴乙酸的影响最小（Delta H = -4.7至-2.4 kJ / mol），温度对卤氧化物的影响范围从Delta H = 8.4 kJ / mol（高氯酸盐到Delta H）碘酸盐＝ -9.1kJ / mol。研究了两个商用柱温箱在色谱运行过程中应用温度梯度的有效性，并采用了最佳系统来提高紧密保留的物质在分离开始，中间和结束时的分离度，该分离是使用先前优化的氢氧化物梯度获得的，在真实的饮用水样本矩阵中。最终方法的保留时间重现性介于0.62至3.18％RSD（n = 30）之间，表明温度编程确实是控制分离度的实际重要参数。 （c）2005 Elsevier B.V.保留所有权利。

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