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Concentrations, Sources, and Associated Risks of Polychlorinated Biphenyls Measured in Soil Profiles from Selected Telecom-masts in the Niger Delta, Nigeria
Soil & Sediment Contamination ( IF 2 ) Pub Date : 2021-06-13 , DOI: 10.1080/15320383.2021.1937934
Onoriode O. Emoyan 1 , Beatrice O. Peretiemo-Clarke 1 , Godswill O. Tesi 2 , Efe Ohwo 1 , Wilson Adjerese 1
Affiliation  

ABSTRACT

This study determined the concentrations, origin, and associated ecological and human health risks of Ʃ28PCBs in soil profiles from selected telecom-masts in the Niger Delta, Nigeria. A total of 18 soil samples were quantified for Ʃ28PCBs with gas chromatography-mass spectrometry after soxhlet extraction with n-hexane/dichloromethane and purified with florisil and silica gel column. The occurrence of the ∑28PCBs varied widely, and ranged from 88.0 to 293 mg kg-1, with pollution load in the order of subsoil > topsoil, and SS 3 > SS 2 > SS 1 > SS 6 > SS 7 > SS 9 > SS 4 > SS 8 > SS 5. The compositional pattern of the ∑28PCBs were in the order of deca-PCB > tetra-PCBs > di-PCBs > penta-PCBs > hexa-PCBs > hepta-PCBs > tri-PCBs > octa-PCBs > nona-PCBs. Also, the LC-PCBs are the dominant PCBs with a composition of 50 to 91.8%, while the HC-PCBs accounted for 34.8 to 78.8%. The levels of the ∑28PCBs from the telecom-masts were significantly higher than the recommended standards for urban and agricultural soils. The ecological risk index, toxic equivalence, hazard index, and total cancer risk suggest ecological risk to soil-dwelling organisms and on-site human occupational risk to soils around the telecom-masts. The source identification depicts that PCBs originated from the use of Aroclor1254 mixtures, cable and wire insulators, lubricants, paints, transformer oils, pesticides, and power capacitors in the telecom masts. Standard guidelines for the operations of telecom-masts should be carried out to mitigate the potential ecological and on-site human occupational risks in soil profiles around the telecom-masts, and similar land use somewhere else around the world.



中文翻译:

尼日利亚尼日尔三角洲选定电信桅杆的土壤剖面中测量的多氯联苯的浓度、来源和相关风险

摘要

本研究确定了尼日利亚尼日尔三角洲选定电信桅杆的土壤剖面中 Ʃ 28多氯联苯的浓度、来源以及相关的生态和人类健康风险。在用正己烷/二氯甲烷索氏萃取并用弗洛里硅和硅胶柱纯化后,用气相色谱-质谱法对总共 18 个土壤样品进行了 Ʃ 28 PCB 的定量分析。28多氯联苯的出现量差异很大,范围为88.0~293 mg kg -1,污染负荷顺序为底土>表土,SS 3 > SS 2 > SS 1 > SS 6 > SS 7 > SS 9 > SS 4 > SS 8 > SS 5. ∑ 28的组成模式PCB的顺序为十-PCB>四-PCB>二-PCB>五-PCB>六-PCB>七-PCB>三-PCB>八-PCB>九-PCB。此外,LC-PCB是占主导地位的PCB,占50%至91.8%,而HC-PCB占34.8%至78.8%。∑ 28的水平来自电信桅杆的多氯联苯明显高于推荐的城市和农业土壤标准。生态风险指数、毒性当量、危害指数和总癌症风险表明对土壤栖息生物的生态风险和对电信桅杆周围土壤的现场人类职业风险。来源鉴定表明,多氯联苯源自使用 Aroclor1254 混合物、电缆和电线绝缘体、润滑剂、油漆、变压器油、杀虫剂和电信桅杆中的电力电容器。应执行电信桅杆操作的标准指南,以减轻电信桅杆周围土壤剖面中潜在的生态和现场人类职业风险,以及世界其他地方的类似土地利用。

更新日期:2021-06-13
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