Luchini L C, Peres T B, de Andréa M M
Instituto Biológico, Centro de Proteção Ambiental, São Paulo, Brazil.
J Environ Sci Health B. 2000 Jan;35(1):51-9. doi: 10.1080/03601230009373253.
This paper reports on the residues of methyl parathion (O,O-dimethyl O-4-nitrophenyl phosphorothioate), trifluralin (alpha, alpha, alpha-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine), endosulfan [(1, 4, 5, 6, 7, 7-hexachloro-8, 9, 10-trinorborn-5-en-2, 3-ylenebismethylene) sulfite] and dimethoate (O, O-dimethyl S-methylcarbamoylmethyl phosphorodithioate) in a cotton crop soil. Soil samples (0-15 cm) were collected at different periods from the cotton crop farm and subjected to Soxhlet extraction. The extracted material was analysed after clean-up by a HP5890 II gas chromatograph equipped with a 63Ni electron-capture detector (ECD-63Ni) and fitted with a 25 m x 0.2 mm i.d. fused silica capillary column [Ultra-2 (5% phenylmethyl polysiloxane)]. The recoveries of the pesticide residues from the spiked control soil were determined after Soxhlet extraction and C18 cartridges clean-up by using radiotracer techniques with the corresponding 14C-pesticides. The results show that in the cotton crop soil the pesticide residues under study were present in the range of 0.1 to 0.4 mg.kg-1. Endosulfan was found to be rapidly degraded in the soil and formed a sulfate metabolite.
本文报道了棉田土壤中甲基对硫磷（O,O-二甲基-O-4-硝基苯基硫代磷酸酯）、氟乐灵（α,α,α-三氟-2,6-二硝基-N,N-二丙基对甲苯胺）、硫丹[(1,4,5,6,7,7-六氯-8,9,10-三降冰片-5-烯-2,3-亚甲基)亚硫酸酯]和乐果（O,O-二甲基-S-甲基氨基甲酰甲基二硫代磷酸酯）的残留情况。在不同时期从棉田农场采集土壤样本（0 - 15厘米），并进行索氏提取。提取后的物质在通过配备63Ni电子捕获检测器（ECD - 63Ni）的HP5890 II气相色谱仪进行净化后进行分析，该气相色谱仪配有一根25米×0.2毫米内径的熔融石英毛细管柱[Ultra - 2（5%苯基甲基聚硅氧烷）]。通过使用相应的14C - 农药的放射性示踪技术，在索氏提取和C18柱净化后测定加标对照土壤中农药残留的回收率。结果表明，在棉田土壤中，所研究的农药残留量在0.1至0.4毫克·千克-1范围内。发现硫丹在土壤中迅速降解，并形成一种硫酸盐代谢物。
