高低锑地下水溶解性有机物分子组成差异和控锑机制分析  

Molecular Composition of Dissolved Organic Matter and Mechanism on Antimony Activities in High and Low Antimony Groundwater

作　　者：梅金华 兰建梅 孙倩倩 郝春明 李海兵 MEI Jin-hua;LAN Jian-mei;SUN Qian-qian;HAO Chun-ming;LI Hai-bing(Hunan Center of Natural Resources Affairs,Changsha 410004,China;Observation and Research Station of Lengshuijiang Mining Ecological Environmental Monitoring,Ministry of Natural Resources,Changsha,410004,China;School of Chemical Safety,North China Institute of Science and Technology,Beijing 101601,China)

机构地区：[1]湖南省自然资源事务中心,长沙410004 [2]自然资源部冷水江矿山生态环境监测野外科学观测研究站,长沙410004 [3]华北科技学院化工安全学院,北京101601

出　　处：《科学技术与工程》2024年第31期13312-13319,共8页Science Technology and Engineering

基　　金：湖南省自然资源厅科技计划(20230150ST);河北省自然科学基金(D2021508004)。

摘　　要：溶解有机质(dissoved organic matter,DOM)的荧光组分可有效调控锑(Sb)在地下水中的运移。然而,其分子组成对Sb环境行为的影响还不明晰。为此,采集了湖南锡矿山锑矿区10组高低Sb地下水样品,通过对比分析DOM分子组成的差异,揭示了DOM分子组成对高Sb地下水形成的调控机制。研究结果表明高低锑地下水中DOM的含量分别为2.24~10.45 mg/L(均值5.19 mg/L)和3.22~3.23 mg/L(均值3.23 mg/L)。相比低Sb地下水,高Sb地下水拥有较高的高度不饱和烃类和多酚,较低浓度的脂肪类化合物、饱和烃类和多环芳烃。高O/C>0.50和低H/C<1.20的高度不饱和烃类和多酚与Sb浓度密切正相关。大分子芳香族DOM可通过与Sb(V)竞争吸附沉积物界面的吸附点位,与Fe和Sb(V)形成DOM-Fe-(V)络合物,以及增强Fe(Ⅱ)和Sb(Ⅲ)共氧化速率来促进高Sb地下水的形成。The fluorescence components of dissolved organic matter(DOM)is a crucial controlling factor in mobilizing antimony in groundwater.However,the effect of molecular composition of DOM on Sb behaviors is still unclear.A total of 10 samples were collected from high-and low-Sb groundwater in the Xikuangshan mine to compare the molecular composition of DOM and to determine the roles of DOM in Sb mobility.The results show that the DOM content in high-and low-Sb groundwater was 2.24~10.45 mg/L(mean 5.19 mg/L)and 3.22~3.23 mg/L(mean 3.23 mg/L),respectively.Compared with low-Sb groundwater,high-Sb groundwater has more highly unsaturated and phenolic compounds and polyphenols,and lower aliphatic compounds,saturated compounds and polycyclic aromatics.Sb positively associated with high O/C ratio(O/C>0.5)and low H/C ratio molecules(H/C<1.2),which mainly grouped as highly unsaturated and phenolic compounds and polyphenols.Complexing agents with Fe and Sb(V),competitive adsorption with Sb(V),and accelerating the rate of Sb(Ⅲ)and Fe(Ⅱ)co-oxidation were considered as the formation mechanisms for DOM on Sb migration at a molecular level.

关 键 词：分子组成 竞争吸附 络合剂 共氧化 高低锑地下水 

分 类 号：TD745[矿业工程—矿井通风与安全]