直链烷基苯磺酸盐在模拟水生态系统中转化和归宿的研究

LABORATORY MODEL ECOSYSTEM OF TRANSFORMATION AND FATE OF ^(14)C-LABELLED LINEAR ALKYLBENZENE SULFONATES

用^(14)C标记直链烷基苯磺酸盐,(^(14)C-LAS),研究了在由塘泥、水草、鱼、螺蛳和溞构成的室内模拟水生态系统中,LAS的降解规律、在水生生物体内的积累分布及其与在水中降解之间的相互关系.

A laboratory model ecosystem was established using natural pond sediment, daphnia, fish, snail and aquatic plants for investigating the degradation, accumulation and distribution of 14C-labelled linear alkylbe-nzene sulfonates (14C-LAS). 89.3% of the LAS degradated in 14 days and two peaks of the accumulation in tested organisms were observed. The first peak appeared after 48 hours of exposure and the second formed after 14 days due to the formation of the degradation products of LAS. The accumulation factors of 14C-LAS in daphnia, fish, snail and aquatic plants were 79.7,18.7, 46.1 and 11.5 respectively and the accumulation factors of the degradation products in these organisms were 244.5, 165.2, 116.8 and 356.9 respectively. A high 14C-radioactivity was detected in aquatic plants, especially in Spirogyra, after 30 days exposure and it might related to the assimilation of 14CO2 which was the final degradation product of 14C-LAS.