逐级化学提取法研究煤中溴的赋存状态  

Study on Modes of Occurrence of Bromine in Coals Using Sequential Chemical Extraction Procedure

作　　者：彭炳先[1,2] 吴代赦[1] 李萍[3] 

机构地区：[1]南昌大学环境与化学工程学院,南昌330031 [2]江西师范大学化学化工学院,南昌330022 [3]南昌大学建筑工程学院,南昌330031

出　　处：《环境科学》2011年第7期2109-2113,共5页Environmental Science

基　　金：国家自然科学基金项目(40133010);南昌大学分析测试基金项目(2008012)

摘　　要：采用逐级化学提取法研究了煤中溴的赋存状态,用电感耦合等离子体质谱(ICP-MS)测定了煤及各种提取状态中溴的含量.结果表明,来自四川和重庆的8个煤中溴主要以水溶态、离子交换态、碳酸盐结合态、铁锰结合态和有机态存在,平均总提取率为88.2%.对于烟煤和无烟煤,前者有机态溴的相对量大于后者,平均值分别为22.3%和20.0%;而碳酸盐结合态溴小于后者,相对量分别为14.0%和19.2%;两者水溶态溴和铁锰结合态溴的相对量几乎相等.煤中离子交换态溴可能以有机质吸附为主,溴的各种赋存形态的相对量与其成煤时沉积环境可能没有很密切的关系.煤中溴的潜在可淋失率和淋出浓度比较大,可淋失率为36.62%～86.80%,可淋失量为7.092～20.10μg/g,对环境的潜在危害应引起重视.Modes of occurrence of bromine in eight coals from Sichuan and Chongqing were studied using inductively coupled plasma spectrometry and sequential chemical extraction. The results showed that the bromine mainly occur the water-soluble, ion exchangeable, carbonate, Fe-Mn oxides and organic fraction in these coals, which average total extraction rate was 88.2%. In bituminous coal and anthracite, the mean relative amount was 22.3% and 20.0% for organic bromine, 14.0% and 19.2% for the bromine of carbonate bound and almost equal for the bromine from water soluble and Fe-Mn oxidizes. The ion exchangeable bromine may be mainly adsorbed to organic matter in these coals. The relative amount of bromine in various modes of occurrence may not be very closely related to its sedimentary environment during the formation of coal. Bromine in coals from Sichuan and Chongqing should be paid more attention because its potential leachable rate was 36. 62%-86. 80% and potential leachable content was 7. 092-20. 10 μg/g.

关 键 词：逐级化学提取 煤 溴 赋存状态 沉积环境 

分 类 号：X142[环境科学与工程—环境科学]