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首页> 外文期刊>Environmental Monitoring and Assessment >Spatial and temporal trends of polychlorinated biphenyls in water and sediment from Nairobi River, Kenya
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Spatial and temporal trends of polychlorinated biphenyls in water and sediment from Nairobi River, Kenya

机译：肯尼亚内罗毕水和沉积物中多氯联苯的空间和时间趋势

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摘要

Polychlorinated biphenyls (PCBs) are chemicals that have become ubiquitous environmental pollutants due to their past use, persistence, and long-range transport thus requiring continuous monitoring. Therefore, this research was carried out to investigate spatial and temporal trends of seven indicator PCBs and two others (PCB 105 and PCB 156) in the Nairobi River. Levels of PCBs ranged from below detection limit (bdl) to 157.64 +/- 1.52 ng g(-1)and bdl to 718.78 +/- 1.71 ng L(-1)for sediment and water, respectively. PCBs 28, 138, and 153 were the most dominant contributing 33.4%, 17.9%, and 14.5% to the total PCBs in sediments and 54.6%, 19.3%, and 14.1% to the total PCBs in water. There was a general increase in sigma PCBs from 18.89 to 151.18 ng g(-1)for sediments and 275.52 to 429.84 ng L(-1)for water as the River flowed downstream. The dry season recorded the highest sigma PCB in sediments while the rainy season recorded the highest sigma PCBs in water, with levels exceeding the WHO water quality guidelines. Risk assessment revealed that populations living downstream are exposed to high levels of PCBs through the consumption of water. Levels of sigma PCBs downstream also exceeded the sediment quality guidelines meaning that aquatic organisms are threatened.
机译：多氯联苯（PCB）是由于其过去的使用，持久性和远程运输而导致普遍存在的环境污染物的化学品，因此需要连续监测。因此，进行了该研究，以研究七种指示器PCB的空间和时间趋势，以及在内罗毕河流中的两种指示器PCB和另外两种（PCB 105和PCB 156）。对于沉积物和水分，PCB的水平从低于检测极限（BDL）至157.64 +/- 1.52ng（-1）和BDL至718.78 +/- 1.71 ng L（-1）。 PCB 28,138和153是最占优势的33.4％，17.9％和14.5％，沉积物中的总PCB，54.6％，19.3％和14.1％至水中的总PCB。沉积物的18.89至151.18 ng（-1）的Sigma PCB普遍增加，沉积物，275.52至429.84 ng L（-1）水，因为河流下游。干燥的季节在沉积物中记录了最高的Sigma PCB，而雨季在水中记录了最高的Sigma PCB，水平超过了WHO水质指南。风险评估显示，通过消费水，患上下游的人口暴露于高水平的PCB。下游的Sigma PCB的水平也超过了沉积物质量指南，这意味着水生物体受到威胁。

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