草酸活化磷矿粉钝化砖红壤中外源铅的研究

姜冠杰; 张峻清; 易珊; 王宝林; 路漫; 胡红青

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草酸活化磷矿粉钝化砖红壤中外源铅的研究

首发时间：2012-11-20

姜冠杰 ^{1
2}
姜冠杰，（1982-），女，讲师，主要从事土壤重金属污染治理研究。
张峻清 ¹ 易珊 ¹ 王宝林 ¹ 路漫 ¹ 胡红青 ¹
胡红青（1966-），男，教授，主要从事土壤化学研究

1、华中农业大学资源与环境学院，武汉 430070
2、江西农业大学国土资源与环境学院，南昌 330045

摘要：磷矿粉被广泛用于固定污染土壤中的重金属，然而施用草酸活化磷矿粉后对土壤中铅形态的研究非常有限。本文采用Tessier连续提取法分析砖红壤中施加未活化和经草酸活化的磷矿粉后，砖红壤中外源铅形态的变化。结果表明：随磷矿粉施加量的增加，各处理中交换态铅质量分数比对照显著下降，可低于检测限；铁锰氧化物和有机物结合态铅的质量分数均比对照增加；PR处理残渣态铅质量分数增加，对APR处理稍低于对照。显然，磷矿粉的施加可有效降低砖红壤中交换态铅质量分数，增加稳定态铅质量分数，且活化磷矿粉的效果更佳。同时，活化后磷矿粉的释磷能力增加，除活化磷矿粉最高施磷量处理外(5000 mg/kg)，施入磷矿粉和活化磷矿粉后释放的磷对环境构成风险可能性极小。XRD（X-射线衍射光谱）和SEM（扫描电镜）结果分析也表明活化磷矿粉的释磷能力增加，更有利于固定土壤中的铅。铅污染土壤施加磷矿粉和活化磷矿粉后，对铅形态的变化进行研究，可为活化磷矿粉固定土壤中的铅提供参考依据。

关键词：土壤学磷矿粉活化磷矿粉铅砖红壤钝化

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Immobilization of Exogenous Lead in Latosol by Oxalic Acid Activated Phosphate Rock

JIANG Guanjie ¹
姜冠杰，（1982-），女，讲师，主要从事土壤重金属污染治理研究。
ZHANG Junqing ² YI Shan ³ WANG Baolin ³ LU Man ³ HU Hongqing ³
胡红青（1966-），男，教授，主要从事土壤化学研究

1、College of Resources and Environment, Huazhong Agricultural University, WuHan 430070
2、 College of Land Resource and Enviroment, Jiangxi Agriculture University, 330045
3、College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070

Abstract：Phosphate rock has been widely and successfully used in immobilization of lead in contaminated soils. However, limited investigations are found about the lead form in the contaminated soils particularly immobilized by oxalic acid-activated phosphate rock. This paper focused on the changes of exogenous lead (Pb) added into latosol after application of phosphate rock (PR) and oxalic acid-activated phosphate rock (APR) by Tessier's sequential extraction procedure. The results indicated that the content of exchangeable Pb in latosol decreased with the increase amount of PR and APR application compared with CK, and was less than the detection limit after some treatments; the content of NaAc extractable Pb in all treatments was higher than CK except for some APR treatments; both the Fe-Mn oxide-bound and organic compound-bound Pb content increased with the increase of PR and APR amount. The residue fraction increased for PR treatments, and decreased a little for APR treatments which were lower than CK treatment. To sum up, after addition of the testing PR in the soil, the content of exogenous exchangeable Pb decreased obviously and the residual Pb content augmented conversely in most treatments, showing that Pb was effectively immobilized and a better fixation effect was obtained in APR. Meanwhile, the results of phosphorus fraction indicated that the release P ability increased more of APR than that of PR. Although exogenous phosphorus was added into latosol, the released phosphorus is unlikely to pose a risk to environment except for the treatment of 5000 mg/kg. The SEM and XRD results also told that the release P ability of PR increased after it was activated, thus APR was better in immobilizing latosol lead. The goal of this research is to evaluate the changes of lead form by application of PR and APR in latosol, and provide the basis for the proper utilization of APR to immobilize lead in contaminated soils.

Keywords： soil science phosphate rock activated phosphate rock lead latosol immobilization

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姜冠杰，张峻清，易珊，等. 草酸活化磷矿粉钝化砖红壤中外源铅的研究[EB/OL]. 北京：中国科技论文在线 [2012-11-20]. https://www.paper.edu.cn/releasepaper/content/201211-345.

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论文编号	201211-345
论文题目	草酸活化磷矿粉钝化砖红壤中外源铅的研究
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