Adyar and Cooum, the two rivers intersecting Chennai city, are exposed to serious pollution due to the release of large quantities of dumped waste, untreated wastewater and sewage. Sediments can act as repository for emerging organic contaminants. Hence, we have monitored the occurrence and risk associated with plasticizers [six phthalic acid esters (PAEs), bis(2-ethyl hexyl adipate) (DEHA)] and bisphenol A (BPA) in surface riverine sediments of Adyar and Cooum rivers from residential/commercial, industrial and electronic waste recycling sites. Σ₇plasticizers (PAEs + DEHA) in the Adyar riverine sediment (ARS) and Cooum riverine sediment (CRS) varied between 51.82–1796 and 28.13–856 ng/g, respectively. More than three-fourth of Σ₇plasticizers came from bis(2-ethylhexyl) phthalate (DEHP), in accordance with the high production and usage of this compound. BPA varied between 10.70–2026 and 7.58–1398 ng/g in ARS and CRS, respectively. Average concentrations of plasticizers and BPA were four times higher in electronic waste (e-waste) recycling sites when compared with industrial and residential/commercial sites. BPA and DEHP showed a strong and significant correlation (R² = 0.7; p < 0.01) in the e-waste sites thereby indicating common source types. Sites present at close proximity to raw sewage pumping stations contributed to 70% of the total BPA observed in this study. For the derived pore water concentration of plasticizers and BPA, the ecotoxicological risk has been found to be higher in ARS over CRS. However, sediment concentrations in all the sites of ARS and CRS were much below the recommended serious risk concentration for human (SRC_human) and serious risk concentration for ecotoxicological (SRC_eco).

与钦奈市相交的两条河流Adyar和Cooum由于大量倾倒废物，未经处理的废水和污水的释放而受到严重污染。沉积物可以充当新出现的有机污染物的储存库。因此，我们已经监测了阿迪亚尔和库姆河表层河流沉积物中增塑剂[六种邻苯二甲酸酯（PAE），己二酸双（2-乙基己基己二酸酯）（DEHA）]和双酚A（BPA）的发生和风险。 /商业，工业和电子废物回收站点。Σ ₇增塑剂（邻苯二甲酸酯+ DEHA）在分别阿达亚河流沉积物（ARS）和Cooum河流沉积物（CRS）变化51.82-1796和28.13-856纳克/克之间。多于三个十四Σ的₇根据该化合物的大量生产和使用，增塑剂来自邻苯二甲酸二（2-乙基己基）酯（DEHP）。在ARS和CRS中，BPA分别在10.70–2026和7.58–1398 ng / g之间变化。与工业和住宅/商业场所相比，电子废物（电子废物）回收场所中增塑剂和BPA的平均浓度高四倍。BPA和DEHP表现出强而显着的相关性（R ²  = 0.7; p <0.01），从而表明常见的废物源类型。在本研究中观察到，靠近原污水泵站的站点占总BPA的70％。对于衍生的增塑剂和BPA的孔隙水浓度，发现ARS的生态毒理学风险高于CRS。但是，ARS和CRS所有站点的沉积物浓度都远低于建议的人类严重危害浓度（SRC_人类）和生态毒理学严重浓度建议（SRC _eco）。