农业环境科学学报Issue(9)：1665-1673,9.DOI:10.11654/jaes.2015.09.006
水分管理对污染土壤中砷锑形态及有效性的影响
Influence of Wetting-Drying and Flooding Water Managements on Forms and Availability of Arsenic and An-timony in Polluted Soils
摘要
Abstract
Xikuangshan is the world′s largest antimony(Sb)mine and the surrounding soils are heavily contaminated with Sb, usually along with arsenic(As)as an associated pollutant. In this study, traditional chemical extraction methods and in- situ synchrotron-based tech-niques such asμ-XRF andμ-XANES were used to reveal forms and availability of As and Sb in the soil from Xikuangshan area. An indoor experiment was also conducted to investigate the effects of water managements(flooding and wetting-drying)on forms and availability of As and Sb.μ-XRF andμ-XANES analyses indicated that in the tested soil, arsenic mainly existed in penta-valent form and the As distribu-tion was significantly correlated with soil Fe, Ca, and S(correlation coefficients being 0.15, 0.32, and 0.38, respectively, P<0.05). Com-pared with alternative wetting-drying, flooding treatment resulted in a large amount of As and Sb release to soil solutions, with 71.7%~4409%increase of As and 3.53%~77.1%rise of Sb in the soil solutions, respectively. Furthermore, flooding treatment caused non-crys-talline Fe oxides to increase by 13.8%, leading to increases in content of As and Sb associated with Fe oxides by 17.6%and 32.33%, re-spectively. A linear correlation was found of Fe-As and Fe-Sb with non-crystalline Fe oxides(r2=0.75 and r2=0.70, respectively, P<0.05), indicating a stronger influence of non-crystalline Fe oxides on As and Sb adsorption. Increased surface areas during transition from crys-talline Fe oxides to non-crystalline Fe oxides promoted adsorption, and thus reduced the mobility and availability of As and Sb. However, enhancement of reductive dissolution of Fe/Mn oxides under flooding condition resulted in more As and Sb released to solution. Therefore, alternative wetting-drying treatment increased the adsorption and fixation of As and Sb, while flooding treatment generally increased their mobility and availability.关键词
水分管理/氧化铁/原位分析/有效性Key words
water management/Fe-oxides/in-situ analysis/availability分类
资源环境引用本文复制引用
崔晓丹,王玉军,周东美..水分管理对污染土壤中砷锑形态及有效性的影响[J].农业环境科学学报,2015,(9):1665-1673,9.基金项目
国家自然科学基金（41422105，41171189）；江苏省杰出青年基金（BK20130050）；江苏省第四期省“333工程”培养资金BRA2015516 （）
