磷酸盐和粘土矿物对Pb和Zn污染土壤的复合稳定剂研究  

Stability of a Stabilizer Compounded of Phosphate and Clay Mineral for Pb and Zn Polluted Soil

作　　者：朱俊[1] 张宇峰[1] 王姗姗[1] 

机构地区：[1]南京工业大学环境科学与工程学院,江苏南京211816

出　　处：《安徽农业科学》2015年第36期167-169,共3页Journal of Anhui Agricultural Sciences

摘　　要：[目的]研究磷酸盐和粘土矿物对重金属污染土壤的稳定化效果。[方法]以模拟Zn和Pb污染土壤作为研究对象,选取几种常见磷酸盐和粘土矿物,进行单一稳定剂投加量试验和复合稳定剂配比试验,确定最佳稳定剂配比。[结果]磷酸盐对于试验土壤的稳定化效果表现为磷酸二氢钾>磷酸二氢钠>磷酸二氢钙,其中磷酸二氢钾对Zn^(2+)和Pb^(2+)的稳定化率分别达84.28%和75.90%;粘土矿物对于试验土壤的稳定化效果表现为高岭土>硅藻土>膨润土,其中高岭土对Zn^(2+)和Pb^(2+)的稳定化率分别达84.45%和72.85%。磷酸二氢钾和硅藻土按1∶2配比组成复合稳定剂,在投加比为100∶5时对土壤中Zn^(2+)和Pb^(2+)的稳定化率分别达94.79%和84.66%;在投加比为100∶5时,磷酸二氢钠和高岭土按1∶3配比组成复合稳定剂,对Zn^(2+)和Pb^(2+)的稳定化率分别达92.94%和88.20%。[结论]磷酸盐与粘土矿物复合稳定剂的稳定效果优于单一稳定剂。[Objective] The aim was to discuss the stability effect of phosphate and clay mineral to heavy metal polluted soil. [Method]Simulated Zn and Pb polluted soil was used as the research object,and several common phosphates and clay minerals were selected to conduct single stabilizer and compound stabilizer experiment to find the best proportion. [Result] The stabilization effect of phosphates to Zn and Pb polluted soil was shown as Na H2PO4 〉Na H2PO4〉 Na（ H2PO4）2,while the stabilization rates of Na H2PO4 to Zn^2＋ and Pb^2＋ were 84. 28% and75. 9% respectively. The stabilization effect of clay minerals to the contaminated soil was shown as kaolin 〉diatomite 〉bentonite,and the stabilization rates of kaolin to Zn^2＋ and Pb^2＋ were 84. 45% and 72. 85% respectively. When the ratio of the soil to a stabilizer compounded of Na H2PO4 and diatomite（ their ratio is 1 ∶ 2） was 100 ∶ 5,the stabilization rates of the stabilizer to Zn2 ＋and Pb^2＋ were up to 94. 79% and84. 66% respectively. As the ratio of the soil to a stabilizer compounded of Na H2PO4 and kaolin（ their ratio is 1∶3） was 100∶5,the stabilization rates of the stabilizer to Zn^2＋ and Pb^2＋ reached 92. 94% and 88. 20% respectively. [Conclusion] The stability effect of a compound stabilizer is better than that of a single stabilizer.

关 键 词：重金属 磷酸盐 粘土矿物 复合稳定 

分 类 号：S181.3[农业科学—农业基础科学]