美舍河清淤底泥分析评价及土地资源化利用

选取美舍河上、中、下游底泥进行取样，测试底泥样品的物理参数（pH、容重、比重、含水率）、营养参数（有机质、速效氮、有效磷、速效钾）和污染物（苯并α芘、总氰化物；锌、铜、镍、镉、总铬、铅、汞、砷）。采用潜在生态危害指数评价法对底泥重金属污染情况进行评价，评价结果表明测试底泥中Cd<8，RI<150，属于无污染水平，底泥重金属污染程度在上中下游表现出不同的情况，上游底泥中金属镉和铜、中下游中锌和镉高于其它重金属。综合分析底泥物性参数、营养参数和污染物水平，美舍河底泥可做种植土壤利用，底泥浸液白菜种子三天发芽率为84%，86%和80%，与种植土壤浸液发芽率相当（84%）。

Analysis, Evaluation and Resource Utilization of Bottom Muddy in Meishe River

Bottom muddies were selected from the upper, middle and lower reaches of the Meishe River, and the physical parameters (pH, volume-weight, specific gravity, percentage of moisture), nutrient parameters (organic matter, available nitrogen, available phosphorus, available potassium) and pollutants (benzo-alpha-pyrene, total cyanide; zinc, copper, nickel, cadmium, total chromium, lead, mercury, arsenic) were tested. The pollution condition and potential ecological risk of heavy metals were evaluated through potential ecological risk index evaluation method, the results showed that the pollution degree Cd<8 and potential risk index RI<150, the bottom muddies were in pollution-free levels. The pollution degree of heavy metals in sediments was different in the upper, middle and lower reaches, Cd and Cu in the upper sediment, Zn and Cd in the middle and lower reaches was higher than that of other heavy metal ions. Based on comprehensive analysis of sediment physical parameters, nutrient parameters and pollutant levels, meishe River sediments could be used as planting soil. The germination rate of Chinese cabbage seeds in sediments leaching solution were 84%, 86% and 80% in three days, which were similar to that in planting soil leaching solution (84%).