Abstract：
The sources and health risk variation of heavy metals (HMs) in sediments of Liujiang River Basin were investigated seasonally to clear the control of HMs contamination in karst rivers. The results revealed the exogenous input of HMs should be more prominent in wet season, due to the higher concentration and EF values. PMF identified HMs were mainly from natural, mining and industrial sources. The input of exogenous HMs were influenced by mining and industrial sources in wet season, but primarily by industrial sources in dry season. HI values were overall below 1, suggesting the relatively low non-carcinogenic risk. The TCR values of HMs were generally beyond 10-6, particularly those of As and Cr even exceeded 10-4 for children, which expressed a high carcinogenic risk. The sources components of As and Cr suggested preventing the migration of mining contaminants and limiting industrial emission should be essential to Liujiang River Basin.
摘要：
对柳江流域沉积物中重金属的来源和健康风险变化进行了季节性调查，以明确岩溶河流HMs污染的控制。结果表明，HMs的外源输入在雨季应该更加突出，由于较高的浓度和EF值。PMF鉴定的HMs主要来自天然，采矿和工业来源。在雨季，外源HMs的输入受到采矿和工业来源的影响，但主要是旱季的工业来源。HI值总体低于1，表明非致癌风险相对较低。HMs的TCR值一般超过10-6，特别是儿童的As和Cr的TCR值甚至超过10-4，表达了很高的致癌风险。砷和铬的来源成分表明，防止采矿污染物的迁移和限制工业排放对柳江流域至关重要。
