Toxicity of synthetic chelators and metal availability in poultry manure amended Cd, Pb and As contaminated agricultural soil.
Toxicity of synthetic chelators and metal availability in poultry manure amended Cd, Pb and As contaminated agricultural soil.
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DOI：
10.1016/j.jhazmat.2013.04.032
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发表时间：
2013-11
影响因子：
13.6
通讯作者：
A. Usman;Y. A. Almaroai;Mahtab Ahmad;M. Vithanage;Y. Ok
中科院分区：
文献类型：
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作者：
A. Usman;Y. A. Almaroai;Mahtab Ahmad;M. Vithanage;Y. Ok
在污染土壤中添加螯合剂可以提高土壤金属的溶解度和植物提取效率。然而，它们会对土壤生物质量产生负面影响。通过90d的培养试验，研究了络合剂与禽粪混合使用对重金属污染农田土壤中有效Cd、Pb、As、CO2-C外排、微生物量C、溶解有机C(DOC)和氮矿化的影响。与不施有机肥的土壤相比，施用禽粪显著提高了土壤的pH、DOC、CO2-C排放、净N矿化、净N硝化和微生物量C。由于pH和DOC的变化，有机肥处理土壤中砷的有效性增加了一倍。然而，与对照土壤相比，添加禽粪对土壤中有效铅和有效镉的浓度没有影响。螯合剂增加了CO2-C的外流、DOC和金属的有效性，但降低了微生物量C和净N矿化。施用EDTA的土壤微生物量C、净N矿化和净N硝化作用的最大降幅可能是由于土壤微生物对金属的有效性高所致。总体而言，合成螯合剂与家禽粪便的结合使用提高了土壤中有效砷的含量，并显示出更好的土壤生物群环境。
Chelating agents added to contaminated soils may increase solubility and phytoextraction efficiency of soil metals. However, they can create negative effects on soil biological quality. A 90-day incubation experiment was conducted to evaluate mixed effects of chelating agents and poultry manure on changes in available Cd, Pb and As, CO2-C efflux, microbial biomass C, dissolved organic C (DOC), and N mineralization in metal-polluted agricultural soil. Application of poultry manure resulted in a considerable increase in soil pH, DOC, CO2-C efflux, net N mineralization, net N nitrification, and microbial biomass C compared to those in unmanured soil. Availability of arsenic increased twice in manure amended soil due to changes in pH and DOC. However, adding poultry manure did not affect the concentrations of available Pb and Cd compared to those in control soil. Chelating agents increased CO2-C efflux, DOC, and metal availability but decreased microbial biomass C and net N mineralization. Maximum decrease in microbial biomass C, net N mineralization, and net N nitrification, was observed in EDTA applied soil possibly due to high metal availability to soil microorganisms. Overall results revealed that the application of synthetic chelators in combination with poultry manure enhances available As and demonstrates better environment for soil biota.