Evaluation on Passivation Effect of Cadmium in Soil Under Different Phosphate Fertilizers Levels

ZHOU Yi-qun; LIANG Cheng-hua; DU Li-yu; WEI Qiao

doi:10.13961/j.cnki.stbctb.2014.06.020

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Evaluation on Passivation Effect of Cadmium in Soil Under Different Phosphate Fertilizers Levels

- Evaluation on Passivation Effect of Cadmium in Soil Under Different Phosphate Fertilizers Levels
- Bulletin of Soiland Water Conservation Vol. 33, Issue 6, Pages: 68-72(2014)
- 作者机构：
  
  沈阳农业大学土地与环境学院,辽宁,沈阳,110866
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2014.06.020
  CLC：
- Published：2014
- 稿件说明：
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ZHOU Yi-qun, LIANG Cheng-hua, DU Li-yu, et al. Evaluation on Passivation Effect of Cadmium in Soil Under Different Phosphate Fertilizers Levels[J]. Bulletin of Soiland Water Conservation, 2014, 33(6): 68-72.
DOI：

ZHOU Yi-qun, LIANG Cheng-hua, DU Li-yu, et al. Evaluation on Passivation Effect of Cadmium in Soil Under Different Phosphate Fertilizers Levels[J]. Bulletin of Soiland Water Conservation, 2014, 33(6): 68-72. DOI： 10.13961/j.cnki.stbctb.2014.06.020.

摘要

通过室内培养试验

以P/Cd摩尔配比分别为0

2:3

3:2

2:1

4:1进行了不同磷肥钝化修复Cd污染土壤试验。采用毒性淋溶提取法(TCLP)和形态分析法评价了磷酸氢二铵(DAP)、磷酸二氢钾(MPP)、过磷酸钙(SSP)和磷酸钙(TCP)对污染土壤中Cd的钝化效果。结果表明

4种磷肥的钝化效果依次为:MPP >DAP >SSP >TCP

4种磷肥的钝化处理可显著降低土壤中TCLP提取态Cd含量

在磷肥剂量水平P/Cd为4:1时对土壤中Cd的钝化效果最佳

最大降低幅度为49%;添加磷肥能够大幅度提高土壤中速效磷的含量

相同磷水平下

土壤中速效磷含量高低次序为:MPP >DAP >SSP >TCP

TCLP提取态Cd含量随土壤速效磷含量升高而显著降低(R=-0.903

);DAP

MPP

SSP和TCP处理后交换态Cd的浓度降幅分别为23.75%

39.06%

16.60%和18.36%

而碳酸盐结合态(WSA)、铁锰氧化物结合态(Fe-Mn-OX)、有机结合态(OM)和残渣态(RES)Cd的含量均有所升高

表明磷素是通过改变Cd的存在形态而降低其有效态含量的。

Abstract

Cultivation experiments were conducted to evaluate the efficiency of four phosphate fertilizers including DAP(diammonium phosphate)

MPP(mono potassium phosphate)

SSP(calcium superphosphate) and TCP(tricalcium phosphate) as stabilizing agents of Cd in contaminated soils. Five molar ratios of P/Cd were tested:0

2:3

3:2

2:1

4:1. The toxicity characteristic leaching procedure(TCLP) and sequential extraction methods were used to evaluate the efficiency. The results showed that four phosphate fertilizers all could effectively reduce soil TCLP extractable Cd concentrations with the stabilization efficiency as MPP >DAP >SSP >TCP. The most effective dose with greatest Cd reduction was 4:1 of P:Cd ratio

the most reduction was 49%; Additions of all tested phosphate fertilizers can greatly improve the soil available phosphorus concentration with the concentration as MPP >DAP >SSP >TCP at the same level of P

TCLP extractable Cd concentration were significantly negatively correlated with soil available phosphorus concentration(R=-0.903**); The decline of exchangeable Cd concentrations in DAP

MPP

SSP

and TCP treated soils was respectively 23.75%

39.06%

16.60% and 18.36%

but increased the Cd in WSA

Fe-Mn-OM and RES. It indicates that Cd in soil can be adsorbed by phosphate fertilizers

reducing the bioavailability of Cd.

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Keywords

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