Distribution and degradation of Alkyl benzene sodium sulfonate, and its harmful effect on carp in Dianchi Lake

Sanitary and industrial sewage is a daily serious detriment to the water quality of Dianchi Lake, Yunnan Province, China. The numerous anionic detergents contained in sanitary sewage and the large number of metallic elements such as Cu, Pb, Cd contained in industrial discharge have made an obvious harmful effect on growth of carp (Cyprinus carpio chilia Wu et al.) in the lake. At the Dianchi Lake sampling and water intake area near Dragon Gate Village, the Linear Alkyl Sulfonate content in the water is over 0.7 (mg/l). This caused the carp's incubation rate and the terateger rate to reach 85% and 28% respectively, and results in a lethality rate of young carp of about 38%. In addition, further study has been stated on the distribution and degradation rates in Dianchi Lake water and in its sediments of two isomeric anionic detergents: ABS (Alkyl Benzene Sulfonate, in short form ABS) and LAS (Linear Alkyl Sulfonate, in short form LAS), and the harmful effect of LAS to its carp. Measures for harnessing and protecting the lake's aquatic environment from pollution, and using the area to develop carp aquaculture are posed. Water quality standards for feeding carp are also covered.