Changes in the Enantiomeric Ratio of (R)- to (S)-Mecoprop Indicate in Situ Biodegradation of This Chiral Herbicide in a Polluted Aquifer
Changes in the Enantiomeric Ratio of (R)- to (S)-Mecoprop Indicate in Situ Biodegradation of This Chiral Herbicide in a Polluted Aquifer
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(R)- 与 (S)-Mecoprop 的对映体比率的变化表明该手性除草剂在受污染的含水层中进行原位生物降解
DOI：
10.1021/es970880q
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发表时间：
1998
影响因子：
11.4
通讯作者：
H. Kohler
中科院分区：
文献类型：
--
作者：
C. Zipper;M. Suter;S. Haderlein;Michael Gruhl;H. Kohler
采用对映体特异性气相色谱法结合质谱法，对瑞士废物处理场的渗滤液样本和垃圾填埋场下游的地下水样本进行了 (R)- 和 (S)-mecoprop [(R)- 和 (S)-2-(4-氯-2-甲基苯氧基)丙酸] 残留物分析。在垃圾填埋场渗滤液中发现 (R)- 和 (S)-甲考丙酸浓度相同（高达 124 μg/L），表明甲考丙酸的外消旋混合物渗滤到接收地下水中。垃圾填埋场下游的地下水样品中含有 <0.001 至 975 μg/L 的甲氯丙酸，31 个样品中有 16 个显示 (R)-甲氯丙酸显着过量。 (R)-和(S)-mecoprop 对含水层基质和各种参考矿物的吸附通常较低，并且在 mecoprop 对映体之间没有区别。我们得出的结论是，在垃圾填埋场渗滤液通过地下水期间，对映选择性微生物降解增加了 (R)- 与 (S)-mecoprop 的对映体比率。大多数受渗滤液影响的地下水是...
Leachate samples from a waste disposal site in Switzerland and groundwater samples downstream of the landfill were analyzed for residues of (R)- and (S)-mecoprop [(R)- and (S)-2-(4-chloro-2-methylphenoxy)propionic acid] by means of enantiomer-specific gas chromatography combined with mass spectrometry. (R)- And (S)-mecoprop were found at equal concentrations (up to 124 μg/L) in the landfill leachate, indicating that a racemic mixture of mecoprop leached to the receiving groundwater. Groundwater samples downstream of the landfill contained from <0.001 to 975 μg/L of mecoprop and 16 out of 31 samples showed a significant excess of (R)-mecoprop. Sorption of (R)- and (S)-mecoprop to aquifer matrix and to various reference minerals was generally low and did not discriminate between the mecoprop enantiomers. We conclude that enantioselective microbial degradation increased the enantiomeric ratio of (R)- to (S)-mecoprop during groundwater passage of the landfill leachate. Most leachate-affected groundwaters are ...