Institute for Risk Assessment Sciences (IRAS), Utrecht University, 3584, Utrecht, the Netherlands.
Recetox, Faculty of Science, Masaryk University, Kotlarska 2, Brno, Czech Republic; Aix-Marseille University, CNRS, LCE, 13003, Marseille, France.
Chemosphere. 2022 Feb;289:133162. doi: 10.1016/j.chemosphere.2021.133162. Epub 2021 Dec 4.
For decades pesticides have been used in agriculture, however, the occurrence of legacy organochlorine pesticides (OCPs) and current-use pesticides (CUPs) is poorly understood in Africa. This study investigates air concentrations of OCPs and CUPs in three South African agricultural areas, their spatial/seasonal variations and mixture profiles. Between 2017 and 2018, 54 polyurethane foam-disks passive air-samplers (PUF-PAS) were positioned in three agricultural areas of the Western Cape, producing mainly apples, table grapes and wheat. Within areas, 25 CUPs were measured at two sites (farm and village), and 27 OCPs at one site (farm). Kruskal-Wallis tests investigated area differences in OCPs concentrations, and linear mixed-effect models studied differences in CUPs concentrations between areas, sites and sampling rounds. In total, 20 OCPs and 16 CUPs were detected. A median of 16 OCPs and 10 CUPs were detected per sample, making a total of 11 OCPs and 24 CUPs combinations. Eight OCPs (trans-chlordane, o,p'-/p,p'-dichlorodiphenyldichloroethylene (DDE)/dichlorodiphenyltrichloroethane (DDT), endosulfan sulfate, γ-hexachlorocyclohexane and mirex) and two CUPs (carbaryl and chlorpyrifos) were quantified in all samples. p,p'-DDE (median 0.14 ng/m) and chlorpyrifos (median 0.70 ng/m) showed the highest concentrations throughout the study. Several OCPs and CUPs showed different concentrations between areas and seasons, although CUPs concentrations did not differ between sites. OCPs ratios suggest ongoing chlordane use in the region, while DDT and endosulfan contamination result from past-use. Our study revealed spatial and seasonal variations of different OCPs and CUPs combinations detected in air. Further studies are needed to investigate the potential cumulative or synergistic risks of the detected pesticides.
几十年来,农药一直在农业中使用,但在非洲,人们对有机氯农药(OCPs)和当前使用的农药(CUPs)的残留情况了解甚少。本研究调查了南非三个农业区空气中 OCPs 和 CUPs 的浓度、它们的空间/季节性变化和混合物特征。在 2017 年至 2018 年期间,54 个聚氨酯泡沫盘被动空气采样器(PUF-PAS)被放置在西开普省的三个农业区,主要生产苹果、鲜食葡萄和小麦。在每个区域内,在两个地点(农场和村庄)测量了 25 种 CUPs,在一个地点(农场)测量了 27 种 OCPs。克朗瓦尔利斯检验调查了 OCPs 浓度的区域差异,线性混合效应模型研究了区域、地点和采样轮次之间 CUPs 浓度的差异。共检测到 20 种 OCPs 和 16 种 CUPs。每种样本中检测到 16 种 OCPs 和 10 种 CUPs,共检测到 11 种 OCPs 和 24 种 CUPs 组合。8 种 OCPs(反式氯丹、o,p'-/p,p'-二氯二苯二氯乙烯(DDE)/二氯二苯三氯乙烷(DDT)、硫丹硫酸盐、γ-六氯环己烷和灭蚁灵)和 2 种 CUPs(甲萘威和毒死蜱)在所有样本中均有定量。p,p'-DDE(中位数 0.14ng/m)和毒死蜱(中位数 0.70ng/m)在整个研究中浓度最高。尽管 CUPs 浓度在不同地点之间没有差异,但几种 OCPs 和 CUPs 在不同地区和季节之间表现出不同的浓度。OCPs 比值表明该地区仍在使用氯丹,而 DDT 和硫丹的污染则是过去使用的结果。本研究揭示了空气中不同 OCPs 和 CUPs 组合的空间和季节性变化。需要进一步研究以调查所检测到的农药的潜在累积或协同风险。