电感耦合等离子体原子发射光谱法测定铸铁锅中7种对人体有害微量元素

提出了用电感耦合等离子体原子发射光谱法(ICP-AES)同时测定铸铁锅中铝、砷、镉、铬、铅、锑、铊7种对人体有害微量元素的方法。样品用硝酸、盐酸溶解后过滤或样品经硝酸、高氯酸冒烟后用王水溶解,然后选择Al 396.152 nm、As 193.759 nm、Cd 228.802 nm、Cr 267.716 nm、Pb 405.783 nm、Sb 206.833 nm、Tl 351.924 nm作为分析线,用电感耦合等离子体原子发射光谱法(ICP-AES)测定。Fe基体对待测元素的干扰通过在配制校准曲线溶液系列时进行基体匹配和采用干扰系数校正法消除。样品中硅、锰、铜对测定没有干扰。方法的检出限(w/%)为0.000 13(Al)、0.000 32(As)、0.000 03( Cd)、0.000 09(Cr)、0.000 93 (Pb)、0.000 59(Sb)和0.001 2(Tl)。方法应用于铸铁标准物质的分析,测定值与认定值相符;应用于铸铁锅实际样品的分析,回收率在92%～112%之间。

Determination of seven harmful micro elements for human body in cast iron pan by inductively coupled plasma atomic emission spectrometry

A simultaneous determination method for seven harmful elements including aluminum, arsenic, cadmium, chromium, lead, antimony, thallium in human body was proposed by inductively coupled plasma atomic emission spectrometry (ICP-AES). After the sample was pretreated either by firstly dissolving with nitric acid and hydrochloric acid and then filtering or by firstly smoking with nitric acid and perchloric acid and then dissolving with aqua regia, it was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) with Al 396.152 nm, As 193.759 nm, Cd 228.802 nm, Cr 267.716 nm, Pb 405.783 nm, Sb 206.833 nm and Tl 351.924 nm as analytical lines. The interference from Fe matrix was eliminated by matrix matching and interference coefficient correction method during preparing calibration curve solution. Silicon, magnesium and copper had no interference with the determination. The detection limit was (w/%) 0.000 13(Al), 0.000 32 (As), 0.000 03 (Cd), 0.000 09 (Cr), 0.000 93 (Pb), 0.000 59(Sb), 0.001 2 (Tl). When the method was applied to the analysis of cast iron pan certified reference materials, the results were consistent with reference values. When applied to the analysis of cast iron pan actual samples, the recoveries were 92%-112%.