Purpose

The present study was conducted to evaluate the carcinogenic and non-carcinogenic hazards of polychlorinated biphenyls (PCBs) in topsoil across business districts, public green space, cultural and educational areas, and roadside and residential areas in city of Tehran, in 2019.

Method

A total of 30 surface urban soil specimens were collected and after preparing them in the laboratory, PCBs contents were determined using gas chromatography-mass spectrometry.

Results

Based on the results of data analyses, the median concentrations of PCB18, PCB28, PCB 29, PCB 31, PCB 44, PCB 52, PCB 101, PCB 138, PCB 141, PCB 149, PCB 153, PCB 189 and PCB 194, were found to be 6.81, 0.759, 0.005, 1.75, 2.51, 0.059, 2.31, 3.76, 5.82, 0.599, 0.408, 0.008 and 0.008 µg/kg, respectively. Also, the overall daily PCBs intakes via soil ingestion, inhalation and skin contact were 5.48E-04, 1.19E + 00 and 1.62E-04 µg/kg, respectively. Thus it was decided that the inhalation of soil could be the main pathway of exposure to PCBs, and that, based on the carcinogenic risk outcomes, children would be more at risk of cancer than adults would.

Conclusions

In general, considering that among the studied urban spaces, the contents of PCBs in public green spaces were more than their rates in other areas, and considering that children normally play in the green areas are, it is recommended that special attention be paid to these areas in controlling and removing pollution caused by PCBs in urban areas.

中文翻译：

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伊朗德黑兰市中南部表层土壤中部分多氯联苯（PCBs）的生态和人类健康风险评估

目的

本研究旨在评估 2019 年德黑兰市商业区、公共绿地、文化和教育区以及路边和住宅区表层土壤中多氯联苯 (PCB) 的致癌和非致癌危害。

方法

共采集 30 个城市地表土壤样品，在实验室制备后，采用气相色谱-质谱法测定 PCBs 含量。

结果

根据数据分析结果，PCB18、PCB28、PCB 29、PCB 31、PCB 44、PCB 52、PCB 101、PCB 138、PCB 141、PCB 149、PCB 153、PCB 189 和 PCB 194 的浓度中位数分别为分别为 6.81、0.759、0.005、1.75、2.51、0.059、2.31、3.76、5.82、0.599、0.408、0.008 和 0.008 µg/kg。此外，通过土壤摄入、吸入和皮肤接触的每日 PCB 总摄入量分别为 5.48E-04、1.19E+00 和 1.62E-04 µg/kg。因此，决定吸入土壤可能是接触多氯联苯的主要途径，并且根据致癌风险结果，儿童比成人更容易患癌症。

结论

总的来说，考虑到在所研究的城市空间中，公共绿地中PCBs的含量高于其他区域，并且考虑到孩子们通常在绿地玩耍，建议特别注意这些。控制和消除城市地区多氯联苯造成的污染。