Li Feng-mei, Wang Xiao-li, Li Yu, Guo Shu-hai, Zhong Ai-ping
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
J Environ Sci (China). 2006;18(6):1233-40. doi: 10.1016/s1001-0742(06)60068-5.
In order to investigate the adsorption mechanism of trace metals to surficial sediments (SSs), a selective extraction procedure was improved in the present work. The selective extraction procedure has been proved to selectively remove and separate Fe, Mn oxides and organic materials (OMs) in the non-residual fraction from the SSs collected in Songhua River, China. After screening different kinds of conventional extractants of Fe and Mn oxides and OMs used for separation of heavy metals in the soils and sediments, NH2OH x HC1 (0.1 mol/L) + HNO3 (0.1 mol/L), (NH4)2C204 (0.2 mol/L) + H2C2O4 (pH 3.0), and 30% of H2O2 were respectively applied to selectively extract Mn oxides, Fe/Mn oxides and OMs. After the extraction treatments, the target components were removed with extraction efficiencies between 86.09% -93.36% for the hydroxylamine hydrochloride treatment, 80.63% -101.09% for the oxalate solution extraction, and 94.76%-102.83% for the hydrogen peroxide digestion, respectively. The results indicate that this selective extraction technology was effective for the extraction and separation of Fe, Mn oxides and OMs in the SSs, and important for further mechanism study of trace metal adsorption onto SSs.
为了研究痕量金属在表层沉积物（SSs）上的吸附机制，本研究改进了一种选择性提取方法。该选择性提取方法已被证明能够从中国松花江采集的表层沉积物中选择性地去除和分离非残留部分中的铁、锰氧化物及有机物质（OMs）。在筛选了用于土壤和沉积物中重金属分离的铁、锰氧化物及有机物质的不同常规提取剂后，分别采用盐酸羟胺（0.1 mol/L）+硝酸（0.1 mol/L）、草酸铵（0.2 mol/L）+草酸（pH 3.0）和30%的过氧化氢选择性提取锰氧化物、铁/锰氧化物及有机物质。经过提取处理后，目标成分被去除，盐酸羟胺处理的提取效率在86.09% - 93.36%之间，草酸盐溶液提取的提取效率在80.63% - 101.09%之间，过氧化氢消解的提取效率在94.76% - 102.83%之间。结果表明，这种选择性提取技术对于表层沉积物中铁、锰氧化物及有机物质的提取和分离是有效的，并且对于进一步研究痕量金属在表层沉积物上的吸附机制具有重要意义。
