土壤淋溶柱色谱中有机调节剂对保留的影响
系统考察了55种非离子型化合物(包括11个氯代苯类、14个烷基苯类、22个多 苯和多环芳烃类化合物、8个农药)在土壤淋溶柱色谱和较宽的淋洗剂(甲醇-水)组成
范围内容量因子(k′)与甲醇体积分数(φ)的关系。用自制加压装柱机将标准土壤干法 装填成10 mm I.d.×100 mm的液相色谱柱,φ=0~0.80的等度淋洗剂的流速1
mL. mi n-1, 柱温(25.0±0.1) ℃, 用UV检测器在线检测。实验表明,log k′ = log k′w+aφ+bφ2和log k′ =
log k′w- Sφ两式均可以用来描述保留规 律,但后者因其计算简单、实验数据点不需太多,可更好地满足实验要求。还解释了同系 列的同系物(甲基苯类、正构烷基苯类)和弱极性氯代苯类中存在的log
k′, log k′w, S的碳(或氯)数规律,该规 律中的斜率m和截距b间也存在线性相关,且均随 φ的增大而线性地减少。
正文
系统考察了55种非离子型化合物(包括11个氯代苯类、14个烷基苯类、22个多 苯和多环芳烃类化合物、8个农药)在土壤淋溶柱色谱和较宽的淋洗剂(甲醇-水)组成
范围内容量因子(k′)与甲醇体积分数(φ)的关系。用自制加压装柱机将标准土壤干法 装填成10 mm I.d.×100 mm的液相色谱柱,φ=0~0.80的等度淋洗剂的流速1
mL. mi n-1, 柱温(25.0±0.1) ℃, 用UV检测器在线检测。实验表明,log k′ = log k′w+aφ+bφ2和log k′ =
log k′w- Sφ两式均可以用来描述保留规 律,但后者因其计算简单、实验数据点不需太多,可更好地满足实验要求。还解释了同系 列的同系物(甲基苯类、正构烷基苯类)和弱极性氯代苯类中存在的log
k′, log k′w, S的碳(或氯)数规律,该规 律中的斜率m和截距b间也存在线性相关,且均随 φ的增大而线性地减少。
关键词:土壤淋溶柱色谱;保留方程;有机调节剂;甲醇;碳(氯 )数规律
中图分类号:O658 文献标识码:A 文章编号:1000-8713(2000)01-0005-05
Influence of Organic Modifier on the Retention Behaviour in Soil Leaching Column
Chromatography
XU Feng, LIANG Xin-miao SU Fan, LIN Bing-cheng
(Dalian Institute of Chemical Physics, The Chinese Ac ademy of Sciences, Dalian
116011, China)
Abstract:The relationship between capacity fac tors (k′) of 55 nonionic compounds
and broad methanol volume per centage (φ) of methanol-water eluent in soil leaching
column c hromatography (SLCC) was systematically investigated. The compounds
consis t of 1 1 chlorobenzenes, 14 alkylbenzenes, 22 polyphenyls and polycyclic
aromatic hydro carbons, and 8 pesticides. Reference soil was dry-packed into
a stainless steel chromatographic column (10 mm I.d.×100 mm) by a homemade pressurizing
device, and isocratic methanol-water mixture with φ from 0.0 to 0.80 eluated
through th e column at a flow-rate of 1 mL*min-1. The column was thermostated
at (25.0±0.1) ℃, and chromatographic peak was monitored by an online ultraviolet
detector. The results show that both equations, log k′ = log k′w+aφ+b φ2 (1)
and log k′= log k′w-Sφ (2), well fit the retenti on values. Equation (2) can
be used practically due to few experimental data nee ded and simpler in formula.
Explanation is also given for the existence of the c arbon (or chlorine ) number
rule for two classes of homologous series (I.e. meth ylbenzenes, n-alkylbenzenes)
and weak-polar chlorobenzenes in the SLCC process. The slope and intercept of
the rule are also well correlated, and both decreases linearly with increasing
eluent φ value.
Key words:soil leaching column chromatography (SL CC);retention equation;organic
modifier;methanol;carbon (or chlorine) number rule
作者简介:许峰(1964-),男,副教授,博士,现在浙江师范大学工作。
许峰(中国科学院大连化学物理研究所, 辽宁 大连 116011)
梁鑫淼(中国科学院大连化学物理研究所, 辽宁 大连 116011)
苏凡(中国科学院大连化学物理研究所, 辽宁 大连 116011)
林炳承(中国科学院大连化学物理研究所, 辽宁 大连 116011)
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