铁砷共沉淀中的硫酸钙对砷固定作用

生态学杂志

铁砷共沉淀中的硫酸钙对砷固定作用

李小亮^1,2,张丹妮¹,王少锋¹,王新¹,宋雨^1,2,贾永锋^1**

(¹中国科学院沈阳应用生态研究所污染生态与环境工程重点实验室，沈阳 110016； ^2中国科学院大学，北京 100049)

出版日期:2014-10-10 发布日期:2014-10-10

Arsenic immobilization by gypsum during iron-arsenic coprecipitation process.

LI Xiao-liang^1,2, ZHANG Dan-ni¹, WANG Shao-feng¹, WANG Xin¹, SONG Yu^1,2, JIA Yong-feng^1**

(¹Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; ² University of Chinese Academy of Sciences, Beijing 100049, China)

Online:2014-10-10 Published:2014-10-10

摘要/Abstract

摘要：

铁砷共沉淀法被广泛应用于有色冶金废水的除砷固砷，但共沉淀过程中产生的硫酸钙的固砷作用迄今尚不清楚。本文利用抗坏血酸将铁砷共沉淀中的硫酸钙分离出来，分析其中的砷含量及确定其质量和固砷百分数，研究了不同pH值初始砷浓度、初始硫酸浓度及Fe/As摩尔比对砷固定的影响。结果表明：随pH值升高，硫酸钙中砷含量及固砷百分数增加。当提高体系初始砷浓度时，硫酸钙所固定的砷含量也增加。在较高初始硫酸浓度或较大Fe/As摩尔时，硫酸钙中砷含量较低，但硫酸钙固砷百分数增加。研究结果有助于进一步认清铁砷共沉淀中砷的赋存形态，为准确评价铁砷共沉淀含砷废弃物的环境风险提供科学依据。

关键词: 氮素分配, 刈割, 羊草, 补偿生长, 盐碱胁迫

Abstract: Iron(III)-arsenate coprecipitation is widely practiced for the removal and immobilization of arsenic from mineral processing solutions and effluents in hydrometallurgical industry. However, the role of gypsum in the fixation of arsenic in the coprecipitation process is still unknown. In this study, the gypsum generated during ironarsenate coprecipitation process was isolated by ascorbic acid leaching and the content of arsenic, the mass of the gypsum and the percentage of arsenic fixed by gypsum were determined. The effects of initial arsenic and sulfuric acid concentrations and Fe/As molar ratio were investigated. The results showed that the content and the percentage of arsenic fixed by gypsum increased significantly with the increase of coprecipitation pH. Raising the initial arsenic concentration of the starting solution would increase the arsenic content in gypsum. The generated gypsum contained lower content of arsenic at higher concentration of sulfuric acid or greater Fe/As molar ratios, but fixed higher percentage of arsenic from the starting solution. The findings in this work have important implications to a better understanding of the speciation of arsenic in the coprecipitates and their environmental risk assessments.

Key words: clipping, saline-alkali stress, nitrogen allocation, Leymus chinensis, compensatory growth

李小亮1,2,张丹妮1,王少锋1,王新1,宋雨1,2,贾永锋1**. 铁砷共沉淀中的硫酸钙对砷固定作用[J]. 生态学杂志.

LI Xiao-liang1,2, ZHANG Dan-ni1, WANG Shao-feng1, WANG Xin1, SONG Yu1,2, JIA Yong-feng1**. Arsenic immobilization by gypsum during iron-arsenic coprecipitation process.[J]. cje.

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