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二（2-乙基己基）磷酸酯从硝酸体系中萃取Mo（Ⅵ）

ISSN号：0253-9950
期刊名称：《核化学与放射化学》
时间：0
分类：X505[环境科学与工程—环境工程] X530.2[环境科学与工程—环境工程]
作者机构：[1]Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China, [2]Institute of Nuclear Physics and Chemistry, CAER Mianyang 621900, China
相关基金：Supported by China National Natural Science Foundation （Nos.21071102 and 91126013）, Joint Funds of China National Natural Science Foundation and China Academy of Engineering Physics （No. 10476015） and National Fund of China for Fostering Talents in Basic Science （No.J1210004）

作者：刘展祥, 黄璜[1], 廖家莉[1], 李兴亮[2], 蹇源[2], 魏洪源[2], 杨远友[1], 罗顺忠[2], 刘宁[1]

关键词：腐植酸类物质, 迁移行为, 双氧铀, 沉淀, 相互作用, 络合, 腐殖酸, 阳离子交换, Interaction, Uranium, Humic acid, Complexation, Migration, Precipitation, Soil

中文摘要：

The complexation, precipitation, and migration behavior of uranium in the presence of humic acid (HA) or fulvic acid (FA) were investigated by cation exchange, ultrafiltration and dynamic experiment, respectively. The results showed that (i) complex equilibrium between the uranium and humic substances was achieved at approximately 72 h, (ii) the coordination number varied from 1:1 to 1:2 ( U(Ⅵ) : humic acid) as pH increased from 3 to 6; and (iii) , while the complex stability constant decreased when temperature increased, but increased with pH value. We found that the precipitation of uranyl could only be observed in presence of HA, and the precipitation was influenced by conditions, such as pH, uranium concentration, temperature, and the HA concentration. The maximum precipitation proportion up to 60% could be achieved in the condition of 40 mg/L HA solution at pH 6. We further observed that the migration behavior of uranium in soil in the presence of humic acid (HA) or fulvic acid (FA) was different from that in the presence of inorganic colloid, and the effect of humic substances (HS) was limited.

英文摘要：

The complexation, precipitation, and migration behavior of uranium in the presence of humic acid （HA） or fulvic acid （FA） were investigated by cation exchange, ultrafiltration and dynamic experiment, respectively. The results showed that （i） complex equilibrium between the uranium and humic substances was achieved at approximately 72 h, （ii） the coordination number varied from l：l to 1：2 （U（VI）： humic acid） as pH increased from 3 to 6; and （iii） , while the complex stability constant decreased when temperature increased, but increased with pH value. We found that the precipitation of uranyl could only be observed in presence of HA, and the precipitation was influenced by conditions, such as pH, uranium concentration, temperature, and the HA concentration. The maximum precipitation proportion up to 60% could be achieved in the condition of 40 mg/L HA solution at pH 6. We further observed that the migration behavior of uranium in soil in the presence of humic acid （HA） or fulvic acid （FA） was different from that in the presence of inorganic colloid, and the effect of humic substances （HS） was limited,