摘要
以几种土壤锰结核为实验材料,采用平衡吸附法和化学选择溶提技术,对不同类型的氧化锰矿物氧化Cr(Ⅲ)进行了研究.结果表明,供试锰结核对Cr(Ⅲ)的氧化能力大小顺序为N1>N4>N2>N5,与所含易还原性锰含量顺序不一致.换算成易还原性锰对Cr(Ⅲ)的氧化后,则其顺序为N4>N2>N1>N5.由组成供试锰结核的主要氧化锰矿物得知,对Cr(Ⅲ)的氧化能力:钠水锰矿>锂硬锰矿>钙锰矿,这可能与氧化锰矿物的结晶程度、晶体构造和Mn(Ⅳ)含量的差异以及Cr(Ⅲ)在氧化锰表面的吸附位置有关.
Oxidation of Cr(Ⅲ) on Mn nodules and types of Mn oxide minerals in several soil are studied by balance-adsorption method and chemical selectivity dissolving technology, and the result show: the sequence that the amount of Cr(Ⅲ) oxidized by test samples is N1>N4>N2>N5, and it is not consistent with the order of test samples' reductive manganese amount. According to the content of Mn in nodules dissolved with 0.1 mol/L NH2OH, HCl. The sequence was N4>N2> N1>N5. The capacity of Cr(Ⅲ) oxidized in order by birnessite, lthiophorite , todorokite, that is related the crystal and structure of Mn oxides, the content of Mn(Ⅳ), and the position of Cr(Ⅲ) adsorption on test samples.
出处
《陕西师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2003年第3期110-114,共5页
Journal of Shaanxi Normal University：Natural Science Edition
基金
国家自然科学基金资助项目(49771049)
