Motshabi Nthabiseng, Ncube Somandla, Nindi Mathew Muzi, Khetsha Zenzile Peter, Malebo Ntsoaki Joyce
Department of Life Sciences Central University of Technology Bloemfontein South Africa.
Department of Chemistry Sefako Makgatho Health Sciences University Pretoria South Africa.
Food Sci Nutr. 2021 Jul 29;9(9):4770-4779. doi: 10.1002/fsn3.2375. eCollection 2021 Sep.
This study evaluated the level of selected pesticide residues in the staple vegetables; . (cabbage), . (Swiss chard), and (potato) from fresh produce markets in the city of Bloemfontein, South Africa. A QuEChERS extraction method was used followed by quantitation using GC-HRT/MS. The pesticide residues were detected in levels lower than the recommended Maximum Residue Levels ranging from not detected to 121.6 ng/kg recorded for heptachlor in cabbage samples. Cabbage was generally susceptible to pesticide residue accumulation with the average total concentration for different markets at 222 mg/kg. The pesticide residues were predicted to be from recent applications but their existence within guideline limits indicated that their use in vegetable farming was within the FAO/WHO recommended good agricultural practices. While the current situation points that consumption of the vegetables in the province poses limited health concerns due to organochlorine pesticides, the unmonitored use of products containing these compounds may result in elevated levels. Continued monitoring and a call for the South African legislature to revise its regulations of the Fertilizers Act to reflect the current international laws on pesticides management is recommended.
本研究评估了南非布隆方丹市新鲜农产品市场上主要蔬菜（卷心菜、瑞士甜菜和土豆）中选定农药残留的水平。采用QuEChERS萃取方法，随后使用GC-HRT/MS进行定量分析。所检测到的农药残留水平低于推荐的最大残留限量，卷心菜样品中七氯的残留量未检出至121.6纳克/千克不等。卷心菜通常易积累农药残留，不同市场的平均总浓度为222毫克/千克。预计这些农药残留来自近期的施用，但其存在于指导限值范围内表明，其在蔬菜种植中的使用符合粮农组织/世卫组织推荐的良好农业规范。虽然目前的情况表明，该省蔬菜消费因有机氯农药对健康造成的担忧有限，但含有这些化合物的产品未经监测的使用可能会导致残留量升高。建议持续进行监测，并呼吁南非立法机构修订其《肥料法》的规定，以反映当前关于农药管理的国际法律。
