Yahaya Abdulrazaq, Okoh Omobola O, Okoh Anthony I, Adeniji Abiodun O
SAMRC Microbial Water Quality Monitoring Center, University of Fort Hare, Alice 5700, South Africa.
Department of Chemistry, University of Fort Hare, Alice 5700, South Africa.
Int J Environ Res Public Health. 2017 Nov 10;14(11):1372. doi: 10.3390/ijerph14111372.
Most organochlorine pesticides (OCPs) which are increasingly used in agriculture and industry are not biodegradable and thereby persist in the environment for a very long period of time. They are capable of negatively impacting the health of humans and biota when present in a higher concentration than recommended. This study evaluated the concentrations of 17 OCPs in surface water samples collected from six sampling sites along the course of the Buffalo River in Eastern Cape, South Africa, between December 2015 and May 2016. The samples were subjected to solvent extraction, followed by florisil clean up, and analyzed using gas chromatography coupled with an electron capture detector. The individual concentrations of OCPs detected ranged from <LOD to 4403 ng/L in summer and <LOD to 313 ng/L in autumn. The levels of OCPs in the study area were generally above the United State Environmental Protection Agency (USEPA) limit of 100 ng/L in all the sampling locations in the two seasons. The cancer risk assessment values were below the permissible limit of the 10 level, although the life average daily dose were slightly above the USEPA maximum limits of 10. Therefore, there is a need for the adequate regulation of agrochemical storage, use, and disposal in this province and other parts of South Africa.
大多数在农业和工业中越来越多地使用的有机氯农药是不可生物降解的，因此会在环境中长时间存在。当它们的浓度高于推荐浓度时，会对人类和生物群的健康产生负面影响。本研究评估了2015年12月至2016年5月期间从南非东开普省布法罗河沿岸六个采样点采集的地表水样本中17种有机氯农药的浓度。样本经过溶剂萃取，然后进行弗罗里硅土净化，并使用气相色谱仪结合电子捕获检测器进行分析。夏季检测到的有机氯农药的个体浓度范围为<检测限至4403纳克/升，秋季为<检测限至313纳克/升。在这两个季节的所有采样地点，研究区域内有机氯农药的水平普遍高于美国环境保护局（USEPA）规定的100纳克/升的限值。癌症风险评估值低于10的允许限值，尽管终生平均每日剂量略高于USEPA的10的最大限值。因此，该省以及南非其他地区需要对农用化学品的储存、使用和处置进行适当监管。
