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Release of Heavy Metals from Dolomite Phosphate Rock after Activation with Organic Agent

文献类型： 外文期刊

作者： Yu, Ying 1 ; Xiong, Jibing 1 ; Liu, Ruliang 1 ; He, Zhenli 1 ;

作者机构： 1.Univ Florida, Indian River Res & Educ Ctr, Inst Food & Agr Sci, 2199 S Rock Rd, Ft Pierce, FL 34945 USA

2.Dalian Maritime Univ, Coll Environm Sci & Engn, Linghai Rd 1, Dalian 116026, Liaoning, Peoples R China

3.China Univ Min & Technol, Sch Environm Sci & Spatial Informat, Xuzhou 221116, Jiangsu, Peoples R China

4.Ningxia Acad Agr & Forestry Sci, Inst Agr Resource & Environm, Yinchuan 750002, Ningxia, Peoples R China

期刊名称：JOURNAL OF ENVIRONMENTAL QUALITY （ 影响因子：2.751； 五年影响因子：3.309 ）

ISSN： 0047-2425

年卷期： 2019 年 48 卷 3 期

页码：

收录情况： SCI

摘要： As high-grade phosphate reserves begin to diminish worldwide, low-grade phosphate rock such as that containing dolomite [CaMg(CO3)(2)] needs to be explored as a potential fertilizer. Activation of dolomite phosphate rock with humic acid substantially increased P availability by chelating Ca2+ and Mg2+. However, the release potential of heavy metals during the activation process should be evaluated. In this study, an orthogonal experiment was designed to investigate the effects of major activating factors on the release of Cd, Cr, Cu, Mn, Ni, Pb, and Zn in activated fertilizers using a batch-equilibrium technique. The release potential of heavy metals from activated fertilizers was further compared with single superphosphate fertilizers made from the same dolomite phosphate rock. The activation process increased water-soluble Cr, Ni, and Zn by 39.8 to 65.7, 26.5 to 35.6, and 6.9 to 14.6 times, respectively, as compared with the original dolomite phosphate rocks, but there was a decrease in water-soluble Cd, Mn, Ni, Pb, and Zn by 1.4 to 5.4, 5.4 to 8.6, 2.3 to 3.7, 0.7 to 2.8, and 2.6 to 5.0 times, respectively, as compared with single superphosphate fertilizers. The release of heavy metals was affected by activating factors including dolomite phosphate rock type, particle size, humic acid dosage, and moisture content. Similar results were obtained with Mehlich-3 extraction, but levels of Mehlich-3-extractable heavy metals were less in activated fertilizers than in the original dolomite phosphate rocks, except Cu. These results indicate that activated fertilizers contain less bioavailable heavy metals than single superphosphate fertilizers and, therefore, are more environmentally friendly for application in agriculture.

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