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首页> 外文期刊>Journal of environmental science and health >Relative influence of the dissolved humic material on the solid-phase extraction efficiency of pesticides from environmental water
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Relative influence of the dissolved humic material on the solid-phase extraction efficiency of pesticides from environmental water

机译：溶解腐殖质对环境水中农药固相萃取效率的相对影响

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The effect of organic matter on the solid-phase extraction (SPE) efficiency for pesticides belonging to different chemical groups (urea-derivatives, carbamates and triazines) and having different polarities, was simultaneously studied for the first time in pure and simulated water samples. SPE was carried out in precolumns packed with C18 silica or styrene-divinylbenzene copolymer PLRP-S phases on-line coupled to high performance liquid chromatography (HPLC) analysis. Retention factors in water (k'w) were estimated for 25 compounds and used for the calculation of the theoretical breakthrough volume (Vb_T) in pure water. Experimental breakthrough volumes (Vb_E) were first determined using purified and deionized water as the matrix for selected compounds having Vb_T ＜ 500 mL; then, the same water with an added humic acid sodium salt (HA) at 0.4-5.6 mg/L of dissolved organic carbon (DOC) content, was used as the matrix for compounds having VbE ＜ 500 mL in pure water. Several polar pesticides showed negative linear or logarithmic Vb_E curves depending on HA content; their recoveries were also determined in environmental samples having low dissolved organic carbon values, between 0.5-6.4 mg/L. A similar behavior was observed for these compounds in simulated and natural water samples, where DOC concentration and the percolated volume (Vp) mainly determine the solute recoveries values. However, the variation of recoveries as a function of DOC content could be negative or null depending on the two examined conditions (Vp lower or larger than Vb_E in pure water). Results demonstrated that breakthrough volume must always be considered to correctly interpret the participation of dissolved humic material on the SPE efficiency of organic micropollutants in water.
机译：在纯净水和模拟水样品中，首次同时研究了有机物对属于不同化学类别（尿素衍生物，氨基甲酸酯和三嗪）且极性不同的农药的固相萃取效率的影响。 SPE在装有C18硅胶或苯乙烯-二乙烯基苯共聚物PLRP-S相的预柱上在线进行，结合高效液相色谱（HPLC）分析。估计了25种化合物在水中的保留因子（k'w），并将其用于计算纯净水中的理论突破体积（Vb_T）。首先使用纯净和去离子水作为选定Vb_T ＜500 mL化合物的基质，确定实验突破体积（Vb_E）。然后，使用添加了腐殖酸钠（HA）且溶解有机碳（DOC）含量为0.4-5.6 mg / L的相同水作为纯水中VbE ＜500 mL的化合物的基质。根据HA的含量，几种极性农药显示出负线性或对数Vb_E曲线。在低溶解有机碳值（0.5-6.4 mg / L）的环境样品中也测定了它们的回收率。在模拟和天然水样品中观察到这些化合物的相似行为，其中DOC浓度和渗滤体积（Vp）主要决定了溶质回收率。但是，取决于两种检测条件（纯水中的Vp低于或大于Vb_E），回收率随DOC含量的变化可能为负或为零。结果表明，必须始终考虑突破体积才能正确解释溶解的腐殖质材料对水中有机微污染物的SPE效率的影响。

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