Lead was mobilized in acid silty clay loam paddy soil with potassium dihydrogen phosphate (KDP) amendment

被引：20

作者：

Xu, Qiao ^{[1
,2
]}

Ye, Binhui ^{[3
]}

Mou, Xiaoyu ^{[1
,2
]}

Ye, Jien ^{[1
,2
]}

Liu, Wenyu ^{[4
]}

Luo, Yating ^{[1
,2
]}

Shi, Jiyan ^{[1
,2
]}

机构：

[1] Zhejiang Univ, Coll Environm & Resource Sci, Dept Environm Engn, Hangzhou 310058, Zhejiang, Peoples R China

[2] Zhejiang Univ, Coll Environm & Resource Sci, MOE Key Lab Environm Remediat & Ecol Hlth, Hangzhou 310058, Zhejiang, Peoples R China

[3] Chengbang Ecoenvironm Co Ltd, Hangzhou 310002, Zhejiang, Peoples R China

[4] Univ Calif Berkeley, Dept Civil & Environm Engn, Berkeley, CA 99720 USA

来源：

ENVIRONMENTAL POLLUTION | 2019年 / 255卷

基金：

中国国家自然科学基金;

关键词：

Lead; Phosphate; Colloids; Availability; Paddy soil; PARTICLE-SIZE FRACTIONS; DIFFUSIVE GRADIENTS; CONTAMINATED SOILS; AGRICULTURAL SOILS; PB IMMOBILIZATION; HEAVY-METAL; ORGANIC-ACIDS; THIN-FILMS; CD; CU;

D O I：

10.1016/j.envpol.2019.113179

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The immobilization effectiveness between Pb and phosphorus in soil varies with soil types. To clarify the effect of phosphate on the availability of Pb in agricultural soil, a culture experiment with three types of paddy soil was performed with potassium dihydrogen phosphate (KDP) added. EDTA, DGT and in-situ solution extraction methods were used to represent different available Pb content. Results showed that the concentration of EDTA-Pb in HN soil was slightly elevated after exogenous KDP added. The supplement of 300 mg/kg KDP significantly increased the content of soluble Pb in both acid silty clay loam soil and neutral silty loam soil (increased by 104.65% and 65.12%, respectively). However, there was no significant influence of KDP on the concentration of DGT extracted Pb. XANES results showed that Pb(OH)(2), PbHPO4, humic acid-Pb and GSH-Pb were the major speciation of Pb in soil colloids. The proportion of Pb(OH)(2) and humic acid-bounded Pb in soil colloids were elevated after exogenous KDP added. Our results indicated that there was a mobilization effect of KDP on Pb by increasing the amount of colloidal Pb in soil solution, especially in acid silty clay loam paddy soil. Such colloid-facilitated transport might promote the uptake of Pb in rice and pose a potential threat to human health. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页数：8