Fang Tao, Li Xiangdong, Zhang Gan
Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Ecotoxicol Environ Saf. 2005 Jul;61(3):420-31. doi: 10.1016/j.ecoenv.2004.10.004. Epub 2004 Dec 7.
The acid-volatile sulfide (AVS), simultaneously extracted metals (SEM), total metals, and chemical partitioning in the sediment cores of the Pearl River Estuary (PRE) were studied. The concentrations of total metals, AVS, and SEM in the sediment cores were generally low in the river outlet area, increased along the seaward direction, and decreased again at the seaward boundary of the estuary. The amounts of AVS were generally greater in deeper sediments than in surface sediments. SEM/AVS was >1 in the surface sediments and in the river outlet cores. The ratio was <1 in the sediments down the profiles, suggesting that AVS might play a major role in binding heavy metals in the deep sediments of the PRE. The SEM may contain different chemical forms of trace metals in the sediments, depending on the metal reaction with 1M cold HCl in the AVS procedure compared with the results of the sequential chemical extraction. The SEM/AVS ratio prediction may overestimate trace metal availability even in the sediments with high AVS concentrations.
对珠江口（PRE）沉积物岩芯中的酸挥发性硫化物（AVS）、同步提取金属（SEM）、总金属及化学分配进行了研究。沉积物岩芯中总金属、AVS和SEM的浓度在河口区域通常较低，沿向海方向增加，并在河口的向海边界再次降低。深层沉积物中的AVS含量通常比表层沉积物中的更高。表层沉积物和河口区域岩芯中的SEM/AVS大于1。该比值在沉积物剖面中小于1，这表明AVS可能在珠江口深层沉积物中重金属的结合中起主要作用。与顺序化学萃取结果相比，取决于金属在AVS程序中与1M冷盐酸的反应，SEM可能包含沉积物中痕量金属的不同化学形态。即使在AVS浓度较高的沉积物中，SEM/AVS比值预测也可能高估痕量金属的有效性。
