Alachlor groundwater contamination

Guideline values proposed by the World Health Organization based on a toxicological approach for each substance are 2 /rg/l for simazine and atrazine, and 20 /rg/l for alachlor. Directive 91/414/CE harmonizes at the European scale the principle of authorization delivery of active substances. For example, a herbicide can be introduced in the positive list of the directive Annex 1 if only the scenario takes into account toxicity, ecotoxicity, and study on presence and fate in the environment, in order to exclude aU risks of groundwater contamination at levels higher than... 

GC-MS total ion chromatograms obtained under xSIS acquisition after SPME extraction of a 0.1 (xg/L spiked sample (above) and a contaminated groundwater sample (below) containing the following pesticide concentrations atrazine 0.043 pg/L, lindane 0.006 xg/L, alachlor 0.020 M-g/L, procymidone 0.068 xg/L, endosulfan I 0.115 (xg/L, dieldrin not quantitated, endosulfan II 0.108 (xg/L, and endosulfan sulfate 0.597 xg/L. (Reprinted from Congalves, C. and Alpendurada, M.F., /. Chromatogr. A, 1026,239,2004. With permission.)... 

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