CHEMICAL-ANALYSIS AND TOXICITY TESTS OF ORGANIC POLLUTANTS IN XI RIVER WATER AND SUSPENDED SEDIMENT OF SHENYANG CITY

In 1987, in a 10-day investigation, two kinds of raw water and their suspended sediment samples were successively collected from the upper and middle reaches of the Xi River. The water and the suspended sediment samples were prepared by filtration of the raw water through a 0.45 mu m membrane. The pH values of the water samples were adjusted to neutral (pH. 6.5), basic (pH 11.0) and acid (pH 2.0) and passed through three adsorption columns filled with GDX macroreticular resin (MRR). The organic pollutants were subsequently eluted from the columns with CH2Cl2. Suspended sediment samples were extracted with CH2Cl2 by Soxhlet extraction. Organic pollutants were separated on silica gel columns and analyzed by GC and GC-MS and assayed for acute toxicity, Ames test response, and micronucleus test response. Over 200 organic pollutants in the river water and the suspended sediments were determined. More than 60 main pollutants were identified according to the results of the chemical analysis and toxicity tests.