铁硅复合材料固定砷的酸释放特征

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Abstract In order to assess the environmental stability of As immobilized by IS (IS-As) under acidification conditions, the acid dissolution characteristics of IS-As were investigated by using acidimetric titration method and X-ray powder diffraction (XRD) analyses. The results showed that IS was strongly resilient to the acid dissolution. The As fixed by IS was the most sensitive to acid dissolution in the pH range of 7.68~11.48, in this range the acid dissolution rate of AsO₄^3- was fast, this non acid-stable As accounted for 37.5% of total dissolved As. The As dissolution rate was relatively low in the pH range of 7.68~4.10. In this range, the proportion of weak acid-stable As accounted for 7% of total As and of acid-stable As was 55.5% of total As. XRD results showed that the dissolution order of major As containing minerals in IS under acidic conditions (ranked from high pH values to low pH values) was:Ca₃(AsO₄)₂ > AlAsO₄ > As₂O₃ > Ca₄SiAs₄ > FeAs₃O₉·4H₂O > Mn₂As₂O₇/SiAs₂. The acid dissolution rate of elements from IS-As was in the order:S(94.8%)>Na(93.0%)>Ca(78.8%)>As(44.5%)>Mg(41.7%)>Al(37.6%)>Mn(37.5%)>Fe(5.5%). Results demonstrated that the non acid-stable As in IS was mainly Ca bound As, the weak acid-stable As was primarily and weakly binding with Mg-, Mn-,Fe bearing minerals, and the acid-stable As was dominantly and strongly binding with Fe-Mn-Si containing minerals. The results provided some basis for the safety risk evaluation of applying IS on soils for the remediation of As contamination. It also provided a new reference for the selection of remediation materials for As contaminated soils as well as studies of soil As speciation.

Key words： iron-silicon material arsenate acid dissolution stability soil

Received: 19 September 2020

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X53

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	JU Lin
	GUO Xiang
	YAO Ai-jun
	QIU Rong-liang
	TANG Ye-tao

Cite this article:

JU Lin,GUO Xiang,YAO Ai-jun等. The acid dissolution characteristics of arsenic fixed by iron-silicon material[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(5): 2329-2335.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I5/2329

[1]	环境保护部,国土资源部.全国土壤污染状况调查公报[J]. 中国环保产业, 2014,5(36):1689-1692. The Environmental Protection Department, the Ministry of Land and Resources. National soil pollution condition investigation communique[J]. Journal of China Environmental Protection Industry. 2014,5(36):1689-1692.
[2]	Zhao F, McGrath S P, Meharg A A. Arsenic as a food chain contaminant:mechanisms of plant uptake and metabolism and mitigation strategies[J]. Annual Review of Plant Biology, 2010,61(1):535-559.
[3]	Jain N, Chandramani S. Arsenic poisoning-An overview[J]. Indian Journal of Medical Specialities, 2018,9(3):143-145.
[4]	陈同斌,韦朝阳,黄泽春,等.砷超富集植物蜈蚣草及其对砷的富集特征[J]. 科学通报, 2002,47(3):207-210. Chen T B, Wei C Y, Huang Z C, et al. The arsenic hyperaccumulation plants Pteris vittata L and it's enrichment characteristics of arsenic[J]. Chinese Science Bulletin, 2002,47(3):207-210.
[5]	殷飞,王海娟,李燕燕,等.不同钝化剂对重金属复合污染土壤的修复效应研究[J]. 农业环境科学学报, 2015,34(3):438-448. Yin F, Wang H J, Li Y Y, et al. Remediation of multiple heavy metal polluted soil using different immobilizing agents[J]. Journal of Agro-Environment Science, 2015,34(3):438-448.
[6]	Yao A J, Wang Y N, Ling X D, et al. Effects of an iron-silicon material, a synthetic zeolite and an alkaline clay on vegetable uptake of As and Cd from a polluted agricultural soil and proposed remediation mechanisms[J]. Environmental Geochemistry and Health, 2017,39(2):353-367.
[7]	Yao A J, Ju L, Ling X D, et al. Simultaneous attenuation of phytoaccumulation of Cd and As in soil treated with inorganic and organic amendments[J]. Environmental Pollution, 2019,250:464-474.
[8]	Zhang F, Itoh H. Iron oxide-loaded slag for arsenic removal from aqueous system[J]. Chemosphere, 2005,60(3):319-325.
[9]	Gu H H, Qiu H, Tian T, et al. Mitigation effects of silicon rich amendments on heavy metal accumulation in rice (Oryza sativa L.) planted on multi-metal contaminated acidic soil[J]. Chemosphere, 2011,83(9):1234-1240.
[10]	Petit J C J, Bouezmarni M, Roevros N, et al. The use of acidimetric titration as a novel approach to study particulate trace metal speciation and mobility:Application to sediments of the Scheldt estuary[J]. Applied Geochemistry, 2009,24(10):1875-1888.
[11]	NY/T 1121.12-2006土壤检测:第11部分:土壤总砷的测定[S]. NY/T1121.12-2006 Soil testing:Part 11:Method for determination of soil total arsenic[S].
[12]	Hartley W, Edwards R, Lepp N W. Arsenic and heavy metal mobility in iron oxide-amended contaminated soils as evaluated by short-and long-term leaching tests[J]. Environmental Pollution, 2004,131(3):495-504.
[13]	Yao S, Liu Z, Shi Z. Arsenic removal from aqueous solutions by adsorption onto iron oxide/activated carbon magnetic composite[J]. Environmental Engineering Science, 2014,12:58.
[14]	于冰冰,颜湘华,王兴润,等.不同稳定化材料对废渣中As的固定效果[J]. 中国环境科学, 2019,39(9):3887-3896. Yu B B, Yan X H.Wang X R, et al. Stabilization effects of different materials on arsenic-containing slag[J]. China Environmental Science. 2019,39(9):3887-3896.
[15]	赵宗昇.氧化铁砷体系除砷机理探讨[J]. 中国环境科学, 1995, 15(1):18-20. Zhao Z S. Mechanism of arsenic removal in oxidized Fe-As system[J]. China Environmental Science, 1995,15(1):18-20.