化学改良剂对红壤中铜、镉吸附行为的影响

Effect of Adjustments on Cu and Cd Sorption in Red Soil

选取壳聚糖和二氧化钛为化学改良剂,分析其对土壤中铜、镉吸附解析行为的影响,以期探明改良剂对污染土壤的修复效果。结果表明,增施壳聚糖可提高土壤中铜、镉活性,二氧化钛则钝化了土壤中重金属的活性,其中纳米二氧化钛和试剂型二氧化钛的钝化效果差别不大。综合考虑经济效益和处理效果,壳聚糖和二氧化钛的合理用量为土重的1%。当培养时间超过20d,各改良剂与土壤重金属作用趋于稳定。土壤酶的种类不同,对土壤重金属的指示作用各异,相比过氧化物酶,脲酶能较好地指示土壤铜、镉污染。

In order to demonstrate the function of remediation,the effect of adjustments （chitosan and titanium dioxide（TiO2） ） on Cu and Cd sorption-desorption in red soil was analyzed.The results indicated that chitosan could improve the Cu and Cd availability in the test soils,while TiO2 would reduce the availability.In addition,there was no significant difference between nanometer material and reagent material in the reducing ability of heavy metal.Viewing from the economic benefits and treatment effects,the optimal dosage of the adjustments was 1% of soil weight.When incubation time was over 20 days,the adjustments and heavy metals became stable.Moreover,soil urease can indicate soil pollution better than soil peroxidase.