不同浸提剂对几种典型土壤中重金属有效态的浸提效率研究

Efficiency of Some Extractants for Available Heavy Metals from Several Typical Soils

测定了7种浸提剂对3种类型土壤中重金属元素Cu、Pb、Cd的浸提量,分析了不同土壤类型条件下Cu、Pb、Cd元素间和不同元素下土壤间浸提率的相关性。结果表明,在7种浸提剂中,EDTA-2Na的浸提效率最高,是最适宜的浸提剂;同种土壤类型条件下,重庆紫壤、河南潮土中重金属Cu、Pb、Cd元素之间的浸提率呈现出浸提率变化相同的趋势。对于同种重金属而言,Cu、Pb在湖南红壤与重庆紫壤、重庆紫壤与河南潮土之间的浸提率呈现出浸提率变化相同的趋势。

The extracted contents of Cu, Pb and Cd in 3 kinds of soils using different extractants were tested. The correlation test among Cu, Pb and Cd on the extraction ratio in 3 kinds of soils and the correlation test among different soils on the extraction ratio for 3 kinds of heavy metals were conducted. Results demonstrated that the suitable extractant for available heavy metals was EDTA- 2Na in all 7 kinds of extractants. The extraction ratio for any two elements among Cu, Pb and Cd in the same soil showed the co- variety trend. The extraction ratio for soils between Hunan red earth and Chongqing purple soil as well as Chongqing purple soil and Henan fluvo- aquic soil for the same kind of heavy metal also showed the co- variety trend.