School of Chemistry and Physics, University of KwaZulu-Natal, Westville, Durban, South Africa.
Sci Rep. 2019 Jan 24;9(1):538. doi: 10.1038/s41598-018-36996-8.
Persistent organic pollutants (POPs) are dangerous and toxic pollutants that may cause adverse effects on human and animal health, including death. POPs such as polychlorinated biphenyls (PCBs) and pesticides are subtly released into the environment from industrial and agricultural use. Global circulation is due to their trans-boundary transport capacity, contingent on aerodynamic and hydrological properties. Plants have capacity to take-up POPs, and these bio-magnify along heterotrophic transfer pathways. In this study, levels of selected 6-PCB congeners and 3- DDTs in some leaf and root vegetables were investigated. Leaf and root vegetables were collected from different horticultural farms areas in Cape Town. The 6-PCBs and 3-DDTs were recovered from the samples using solid phase extraction(SPE), followed by GC-MS analysis. The ΣPCBs and ΣDDT (on-whole basis), were ranged: 90.9-234 ng/g and 38.9-66.1 ng/g respectively. The 3-PCBs and 6-DDTs levels were slightly higher in leaf vegetables compared to root vegetables. The detection of PCBs and DDTs in the vegetables suggest the probable use of PCBs containing pesticides. Although the observed concentrations were below the WHO maximum residue limits, consumption of such contaminated leaf and root vegetables portend a health risk.
持久性有机污染物（POPs）是危险和有毒的污染物，可能对人类和动物健康造成不良影响，包括死亡。多氯联苯（PCBs）和农药等 POPs 从工业和农业用途中微妙地释放到环境中。由于其具有跨边界传输能力，全球循环取决于空气动力学和水文学特性。植物具有吸收 POPs 的能力，并且这些物质沿着异养转移途径生物放大。在这项研究中，研究了开普敦不同园艺农场地区的一些叶菜和根菜中选定的 6-PCB 同系物和 3-DDT 的水平。从不同的园艺农场地区采集叶菜和根菜。使用固相萃取（SPE）从样品中回收 6-PCBs 和 3-DDT，然后进行 GC-MS 分析。ΣPCBs 和 ΣDDT（整体基础）的范围分别为 90.9-234ng/g 和 38.9-66.1ng/g。与根菜相比，叶菜中的 3-PCBs 和 6-DDT 水平略高。蔬菜中 PCB 和 DDT 的检测表明可能使用了含有 PCB 的农药。尽管观察到的浓度低于世界卫生组织的最大残留限量，但食用这些受污染的叶菜和根菜可能会带来健康风险。
