Determination of trace metals in seawater by on-line column preconcentration inductively coupled plasma mass spectrometry
Determination of trace metals in seawater by on-line column preconcentration inductively coupled plasma mass spectrometry
复制标题
在线柱预富集电感耦合等离子体质谱法测定海水中的痕量金属
DOI：
10.1016/s0003-2670(01)00859-5
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发表时间：
2001
影响因子：
6.2
通讯作者：
O. Shikino
中科院分区：
文献类型：
--
作者：
S. Hirata;Y. Ishida;M. Aihara;Kazuto Honda;O. Shikino
采用自制的亚氨基二乙酸功能基树脂Muromac A-1柱分离富集海水中的痕量金属（Al、V、Mn、Co、Ni、Cu、Zn、Mo、Cd、Pb、U）。建立了一种低压流动在线柱预富集电感耦合等离子体质谱（ICP-MS）测定海水中痕量金属的自动分析方法。样品溶液（调节至pH 5.0）通过柱，用水洗涤柱后，吸附的金属随后用0.7M硝酸洗脱到血浆中。校准曲线由净化的人工海水完成，样品加载时间为120 s。人工海水中痕量金属的检出限分别为Al 0.007、V 0.011、Mn 0.007、Co 0.014、Ni 0.029、Cu 0.099、Zn 0.076、Mo 0.007、Cd 0.010、Pb 0.007、U 0.001ngml− 1。作为分析物金属的浓度，对应于8次重复测量的空白信号强度标准偏差的3倍（3σ）。11种元素的精密度小于±5.4%，一个样品可在7 ml、8 min内处理。通过对海水卡斯-3和NASS-4两种标准物质的分析，验证了该方法的有效性。
A home made column of commercially available imminodiacetic functional group resin, Muromac A-1 was used to separate and concentrate trace metals (Al, V, Mn, Co, Ni, Cu, Zn, Mo, Cd, Pb and U) from seawater. An automated low pressure flow analysis method with on-line column preconcentration/inductively coupled plasma mass spectrometry (ICP-MS) is described for the determination of trace metals in seawater. Sample solutions (adjusted to pH 5.0) passed through the column, after washing the column with water, the adsorbed metals were subsequently eluted into the plasma with 0.7M nitric acid. Calibration curves were accomplished by means of purified artificial seawater with a sample loading time of 120s. Detection limits of the trace metals in the artificial seawater were 0.007 for Al, 0.011 for V, 0.007 for Mn, 0.014 for Co, 0.029 for Ni, 0.099 for Cu, 0.076 for Zn, 0.007 for Mo, 0.010 for Cd, 0.007 for Pb and 0.001ngml−1for U, respectively, as the concentrations of analyte metals corresponding to three times (3σ) the standard deviation of blank signal intensities by eight replicate measurements. The precision was less than ±5.4% for 11 elements and one sample can be processed in 7ml and 8min. The proposed method was verified by the analysis of two reference standard materials of seawater CASS-3 and NASS-4.