中文摘要：

通过盆栽试验，研究了在Pb污染土壤中施加新型壳聚糖衍生物（SCTA—I）促进植物修复的效率；试验了添加剂对土壤中Pb的解吸作用，对土壤溶液中Pb的总浓度及其对植物体内金属的传输和累积的影响。结果表明，在Pb污染的土壤中加入SCTA—I后能显著地增加土溶液中Pb的总浓度．水提取Pb的浓度可增大130—180倍。新型螫合剂能加速Pb在植物体内的传输速度，使植物木质液中金属的浓度增大．最大可增加120倍。SCTA—I的加入能增加玉米对Pb的吸收量，其根部和枝叶部分Pb的含量显著增大，促进植物对Pb的累积，提高土壤植物修复的效率。通过对几种螯合剂的试验，影响土壤中Pb的解吸及促进玉米累积Pb的能力大小为EDTA〉SCTA—I〉CA〉CTS，其中SCTA—I的作用仅次于EDTA。

英文摘要：

Phytoremediation, using plants to extract heavy metals from contaminated soils, is an emerging technology. The potential of adding ehitosan chelating agent bearing sulfhydryl group （SCTA-I） to Pb-contaminated soils to increase Pb accumulated in plants were investigated. The effects of SCTA-I on the properties of soil solution, the concentration of Pb in the soil extracts, the concentration of Pb in the xylem sap and Pb uptake by corn were studied. The results showed that the total concentration of Pb in soil solution and xylem sap significantly increased after the addition of SCTA-I. The addition of SCTA-I to Pb contaminated soll increased shoot Pb concentration of corn from 1 200-7 800 mg.kg-I, and root Pb concentration of corn from 1 400-8 100mg· kg^-1. For the chelates tested, the order of the effectiveness in increas- ing Pb accumulation in corn was EDTA〉SCTA-I〉CTA〉CTS. The SCTA-I also significantly increased the translocation of Pb from roots to shoots. Compared to the control, Pb concentration in the corn xylem sap increased 120 times when adding SCTA-I solution to the contaminated soil.