排序方式: 共有12条查询结果,搜索用时 0 毫秒
11.
Rey Gutierrez Rutilio Ortiz Salvador Vega Beatriz Schettino Maria L. Ramirez Jose J. Perez 《Journal of environmental science and health. Part. B》2013,48(11):935-940
A survey was carried out from 2008 to 2010 to determine the concentrations of 16 organochlorine pesticide residues (OPRs) from Tizayuca, Hidalgo, Mexico. Organochlorine residue determinations were made from milk fat, using chromatographic cleanup and analysis by gas chromatography with an electron capture detector. The OPR concentrations found were from below the detection limit (DL) to 0.91 ng g?1 in 2008, DL to 0.38 ng g?1 in 2009 and DL to 0.59 ng g?1 in 2010. In general concentrations of organochlorine pesticides were higher in the wet season (3.37 ng g?1 and 4.79 ng g?1) than the dry season (1.92 ng g?1 and 2.71 ng g?1) for 2009 and 2010, due to control of pests in the pasture and sheds. According to Codex Alimentarius regulations, individual pesticides did not exceed the permissible limits, which for example were 10 μg kg?1 for alpha hexachlorocyclohexane (HCH) and endosulfan I, 20 μg kg?1 for p,p’-DDT, and 6 μg kg?1 for dieldrin, endrin and heptachlor. A reduction of organochlorine pesticide concentrations in cow's milk was noted, indicating that the Mexican government has achieved reduction or elimination of some organochlorine pesticides in response to global agreements on persistent organic pollutants. 相似文献
12.
对执行《饮食业油烟排放标准》监测中的采样时间与数据处理中出现的问题进行了探讨,提出了应在标准修改中对采样时间及数据处理作适当修改的意见。 相似文献