Abstract

Assessment of 17 polyaromatic hydrocarbons (PAHs) was made to understand the sources, toxicity risk and biological impact in surface sediments of Malad and Versova creek of Mumbai. The concentration of ΣPAHs was found to vary in the range of 2915–4204 ng/g dw (mean 3367 ± 948 ng/gdw). The concentration of high molecular weight PAHs (HMW PAHs) in the range of 2378–3394 ng/g dw (mean 2723 ± 755 ng/g dw) was higher than that of low molecular PAHs (LMW PAHs) which was in the range of 528–810 ng/g dw (mean 644 ± 202 ng/g dw). The contribution of HMW PAHs to the ∑PAHs was 80.86% while that of LMW PAHs was 19.14%. The concentration of carcinogenic PAHs was 1452–1996 ng/g dw (mean 1631 ± 447 ng/g dw) having contribution of 48.43% to the ∑PAHs. The assessment of biological risk and toxicity was made based on toxic equivalent quantity (TEQ) and sediment quality guideline quotient (SQGQ). The PAH levels are feared to increase in coming times thereby creating probable threat to the biological life and health hazard to the nearby human population.

摘要

对 17 种多环芳烃 (PAH) 进行了评估，以了解孟买 Malad 和 Versova 溪表层沉积物的来源、毒性风险和生物影响。ΣPAH 的浓度变化范围为 2915–4204 ng/g dw（平均值 3367 ± 948 ng/gdw）。高分子量PAHs（HMW PAHs）的浓度在2378-3394 ng/g dw（平均2723±755 ng/g dw）范围内高于低分子PAHs（LMW PAHs），其范围在528–810 纳克/克干重（平均值 644 ± 202 纳克/克干重）。高分子量PAHs对ΣPAHs的贡献为80.86%，而低分子量PAHs的贡献率为19.14%。致癌PAHs浓度为1452-1996 ng/g dw（平均1631±447 ng/g dw），占总PAHs的48.43%。根据毒性当量（TEQ）和沉积物质量指导商（SQGQ）进行生物风险和毒性评估。人们担心 PAH 水平在未来会增加，从而可能对生物生命造成威胁，并对附近人群的健康造成危害。