图们江中游表层沉积物中重金属的赋存形态研究

Species of heavy metal elements in the sediments from middle reaches of Tumen river

采用改进后的BCR三步法对图们江中游表层沉积物中重金属元素(Cr、Cu、Zn、Pb、Cd)的赋存形态进行研究,对残渣态和重金属总量进行微波消解,然后利用电感耦合等离子体质谱(ICP-MS)对其进行测定.结果表明:在图们江中游的7个采样点中,日光采集点表层沉积物中重金属元素Cr、Cu、Pb、Zn的质量分数最高;Cr、Zn、Pb、Cd各形态所占比例相近,主要以残渣态存在;Cu在可还原态和可氧化态的比例较高,存在潜在的生态危害.

Species of heavy metal elements （Cr, Cu, Zn, Pb, Cd） in the sediments from middle reaches of Tureen river is investigated using the revised BCR procedure. The total of heavy metal elements and the residue is digested using microwave digestion system. The elements are detected by Inductively Coupled Plasma Mass- Spectrometry （ICP-MS）. It is shown that the content of heavy metal elements （Cr, Cu, Pb, Cd） is the high- est in Riguang sampling point. All forms of proportion for Cr, Zn, Pb and Cd are similar, they exist mainly in residual form （B4 form）. Proportion for Cu is higher in the reducible form （B2 form） and the oxidation form （B3 form）, furthermore, there is potential for ecological harm and major for environmental impact.