分级提取-电感耦合等离子体质谱分析黄铁矿烧渣中重金属的化学形态

Analysis of chemical states of heavy metals in pyrite cinder using sequential chemical extraction-inductively coupled plasma-mass spectrometry

采用分级提取法考察了黄铁矿烧渣中重金属元素的赋存状态,得到了这些元素的化学形态为酸可交换态、易还原态、可氧化态和残余态。用电感耦合等离子体质谱法(ICP-MS)测定了各种状态中的钒、铬、锰、钴、镍、铜、锌、锶、钼、镉、锑、钡和铅13种重金属元素。结果表明,各种状态的锰、锌总量最大,分别为3 971 mg/kg和3 485 mg/kg;其次是铅、钡,各态总量为903 mg/kg和901 mg/kg;钒、铬、钴、镍、铜、锶、钼、镉和锑相对较少,各态总量均不超过45mg/kg。本法测定了各元素的线性范围,相关系数均大于0.995,检出限为0.005-0.01μg/L,相对标准偏差(RSD)均小于等于4.5%。

The chemical states of the heavy metal elements V, Cr, Mn, Co, Ni, Cu, Zn, Sr, Mo, Cd, Sb, Ba and Pb existing in pyrite cinder were investigated by using sequential chemical extraction, and the states of these elements including exchangeable, reducible, oxidable and residual state were gained. The concentrations of these elements in all states were determined by inductively coupled plasma-mass spectrometry （ICP-MS）. The results show that Mn and Zn were the main heavy metals in pyrite cinder and their total contents in all states were 3 971 mg/kg and 3 485 mg/kg, respectively; Pb and Ba were the second and their total contents were 903 mg/kg and 901 mg/kg, severally. The individual contents of V, Cr, Co, Ni Cu, Sr, Mo, Cd and Sb in all states was less, no more than 45 mg/kg. The linear ranges of determination for these elements were got, the correlation coefficients were more than 0. 995. The detection limits were from 0.005 to 0.01μg/L, and RSDs were less or equal to 4.5%.