土壤铁锰氧化物形态测定及吸附Sb(Ⅲ)的主控因子研究

崔婷; 叶欣; 朱霞萍; 李军亚; 徐欢

doi:10.15898/j.cnki.11-2131/td.202111250187

土壤铁锰氧化物形态测定及吸附Sb(Ⅲ)的主控因子研究

Determination of Various Forms of Iron and Manganese Oxides and the Main Controlling Factors of Absorption of Sb(Ⅲ) in Soil

摘要

摘要: 研究影响土壤吸附Sb(Ⅲ)的主控因子对土壤锑污染的评价、预警及修复具有重要意义。本文采用化学法、电感耦合等离子体发射光谱法和原子荧光光谱法测定了10个不同地区土壤的理化性质和机械组成、主要化学组成，采用原子吸收光谱法测定了土壤铁锰氧化物的不同形态以及土壤对Sb(Ⅲ)的饱和吸附容量, 并开展了土壤对Sb(Ⅲ)的饱和吸附容量和土壤理化性质、机械组成、铁锰氧化物及其形态的相关性分析、主成分分析和因子分析。在研究土壤吸附Sb(Ⅲ)的影响因素基础上，进一步研究其主控因子。结果表明，10个不同性质的土壤对Sb(Ⅲ)饱和吸附容量介于0.63~3.98mg/g之间，与土壤类型有关，其大小顺序为：红壤＞棕壤＞黄壤＞褐土＞沙土。土壤对Sb(Ⅲ)饱和吸附容量与阳离子交换容量(CEC)、氧化铁总量、无定形铁含量呈极显著正相关，与游离铁含量、无定形锰含量以及游离锰含量呈显著正相关。主成分分析和因子分析结果表明土壤中6个因子是影响土壤吸附Sb(Ⅲ)的主控因子，影响力大小为：氧化铁总量＞CEC＞无定形铁含量＞游离铁含量＞无定形锰含量＞游离锰含量。铁锰氧化物及其形态显著影响土壤吸附Sb(Ⅲ)。

Abstract:
BACKGROUND It is of great significance for evaluation, early warning and remediation of antimony contaminated soil to study the sorption factors affecting Sb(Ⅲ) adsorption in soil.
OBJECTIVES To investigate the forms of Fe and Mn oxides and controlling factors of Sb(Ⅲ) adsorption in soil.
METHODS The physicochemical properties, mechanical composition, and main chemical composition of soils from 10 different areas were determined by chemical method, inductively coupled plasma-optical emission spectrometry and atomic fluorescence spectrometry. The contents of different forms of iron and manganese and the saturated adsorption capacity of soils to Sb(Ⅲ) were determined by atomic absorption spectrometry. The correlation analysis, principal component analysis and factor analysis of soil saturated adsorption capacity to Sb(Ⅲ), soil physicochemical properties, mechanical composition, iron and manganese oxides and their forms were carried out by SPSS 21.0.
RESULTS On the basis of studying the influencing factors of soil adsorption of Sb(Ⅲ), the main controlling factors were further studied. The saturated adsorption capacity of soil to Sb(Ⅲ) was between 0.63mg/g and 3.98mg/g, and was related to soil type with the order of red soil>brown soil>yellow soil>cinnamon soil>sandy soil. According to the correlation analysis results, the saturated adsorption capacity of soil to Sb(Ⅲ) was significantly positively correlated with cation exchange capacity, total iron oxide, amorphous iron content, and was positively correlated with free iron content, amorphous manganese content and free manganese content. The principal component analysis and factor analysis showed that these six factors were the main controlling factors affecting the adsorption of Sb(Ⅲ) in soil, and the influence degree was: total iron oxide>cation exchange capacity>amorphous iron content>free iron content>amorphous manganese content>free manganese content.
CONCLUSIONS The adsorption capacity of soil to Sb(Ⅲ) is significantly affected by the total amount of iron and manganese oxides and their forms.

HTML全文

参考文献(39)

施引文献

资源附件(0)