Personal care product (PCP) chemicals have a greater chance of accumulation in the aquatic environments because of their volume of use. PCPs are biologically active substances that can exert an adverse effect on the ecology and food safety. Information on the status of these substances in Indian open water ecosystems is scarce. In this paper, we report the incidence of two synthetic antimicrobials, triclosan (TCS), including its metabolite methyl-triclosan (Me-TCS) and triclocarban (TCC) in Torsa, a transboundary river flowing through India. In water TCS and TCC were detected at levels exceeding their respective PNEC (Predictive No Effect Concentration). Both the compounds were found to be bioaccumulative in fish. TCS concentration (91.1–589 µg/kg) in fish was higher than that of TCC (29.1–285.5 µg/kg). The accumulation of residues of the biocides varied widely among fishes of different species, ecological niche, and feeding habits. Me-TCS could be detected in fishes and not in water. The environmental hazard quotient of both TCS and TCC in water indicated a moderate risk. However, the health risk analysis revealed that fishes of the river would not pose any direct hazard to human when consumed. This is the first report of the occurrence of these PCP chemicals in a torrential river system of the eastern Himalayan region.

由于个人护理产品（PCP）的使用量较大，因此它们在水生环境中积累的机会更大。五氯苯酚是生物活性物质，会对生态和食品安全产生不利影响。关于这些物质在印度开放水域生态系统中的状况的信息很少。在本文中，我们报告了两种合成抗菌剂三氯生（TCS）的发生率，包括其代谢产物甲基三氯生（Me-TCS）和三氯卡班（TCC）在流经印度的跨界河流Torsa中的发生率。在水中，TCS和TCC的含量超过了各自的PNEC（预测无效浓度）。发现这两种化合物在鱼类中都具有生物蓄积性。鱼类中TCS的浓度（91.1–589 µg / kg）高于TCC（29.1–285.5 µg / kg）。在不同物种，生态位和进食习惯的鱼类之间，杀生物剂残留的积累差异很大。Me-TCS可以在鱼类中而不是在水中检测到。水中TCS和TCC的环境危害指数均表明存在中等风险。但是，健康风险分析表明，食用河中的鱼类不会对人类造成任何直接危害。这是关于这些五氯苯酚化学物质在喜马拉雅东部地区洪流系统中发生的第一份报告。健康风险分析表明，食用该河流的鱼类不会对人类造成任何直接危害。这是关于这些五氯苯酚化学物质在喜马拉雅东部地区洪流系统中发生的第一份报告。健康风险分析表明，食用该河流的鱼类不会对人类造成任何直接危害。这是关于这些五氯苯酚化学物质在喜马拉雅东部地区洪流系统中发生的第一份报告。