^(110m)Ag在海洋环境中行为的研究

A STUDY ON BEHAVIOUR OF^(110m)Ag IN MARINE ENVIRONMENT

本文对 110 m Ag在海洋环境中的化学形态和在底泥上的吸附行为及在海洋生物中的浓集状况进行了研究。结果表明 ,110 m Ag在海水中以110 m Ag+ ∶ 110 m Ag Cl2 -≈ 10 -5存在 ,且当 [Ag+ ][Cl-]达到 Ag Cl的溶度积 (1.56× 10 -10 )时便生成 Ag Cl沉淀。海水中的 110 m Ag在底泥上的吸附系数随温度的升高或固液体积比增大而减小 ,尤其是受水质影响很大 ,海水中 110 m Ag在底泥中的吸附系数 (10 2 )比淡水中低两个量级。海洋生物对海水中的 110 m Ag有较强的浓集作用 ,依生物种类不同其生物累积因子的量级为 10 2～ 10 4。

This paper discribes a study on the behaviour of 110m Ag in marine environment.It includes the chemical species of 110m Ag in seawater,the absorption factor K d in/on seasediment and biological concentration factor B f of marine biome for 110m Ag.The experiment and theoretical calculation indicate that 110m Ag exists as 110m AgCl - 2 ∶ 110m Ag +≈10 5 in seawater and AgCl precipitation is formed when [Ag +][Cl -]≥1.56×10 -10 . K d in/on sediment decreases with increasing of temperature and /or liquid/solid ratio.The effect of water nature on K d is very considerable.And the K d on sediment is in the order of 10 2 mL/g under the seawater atmosphere,which is two orders lower than under the freshwater atmosphere. 110m Ag is concentrated by marine biome strongly.B f is in the range of 10 2～10 4 depending on different kind of marine biome. (