Speciation of yttrium and lanthanides in natural water by inductively coupled plasma mass spectrometry after preconcentration by ultrafiltration and with a chelating resin
Speciation of yttrium and lanthanides in natural water by inductively coupled plasma mass spectrometry after preconcentration by ultrafiltration and with a chelating resin
复制标题
通过超滤和螯合树脂预浓缩后，通过电感耦合等离子体质谱法测定天然水中钇和镧系元素的形态
作者：
H. Haraguchi;A. Itoh;C. Kimata;H. Miwa
使用尺寸排阻色谱、紫外吸收检测和 ICP-MS 的组合系统来阐明从日本琵琶湖收集的湖水中钇和镧系元素的溶解状态。湖水样品在用玻璃过滤器（孔径1.0μm）过滤后立即用膜过滤器（孔径0.45μm）过滤。螯合树脂预浓缩后，通过ICP-MS测定滤液中溶解的镧系元素的总浓度。为了进行形态分析，使用超滤过滤器将上述过滤后的水样进一步预浓缩 30-500 倍，从而可以预浓缩分子量 >10000 的分子。然后使用上述组合系统对预浓缩的样品溶液进行形态分析，其中使用分子渗透范围在1000至300000之间的尺寸排阻柱进行分子分离。在254 nm处紫外吸收检测获得的尺寸排阻色谱图中，在对应于分子量>300000（峰1）和约50000-10000（峰2）的保留时间处获得一些大有机分子的两个峰。在ICP-MS在线测量的色谱图中，在与上述有机大分子相对应的两个峰位置处发现了钇和镧系元素（Y、La、Ce和Pr）。
A combined system of size exclusion chromatography, UV absorption detection and ICP-MS was used for elucidation of the dissolved states of yttrium and lanthanide elements in lake water collected from Lake Biwa, Japan. The lake water samples were filtered with a membrane filter (pore size 0.45 µm) just after filtration with a glass filter (pore size 1.0 µm). The total concentrations of the dissolved lanthanide elements in the filtrate were determined by ICP-MS after chelating resin preconcentration. For speciation analysis, the above filtered water samples were further preconcentrated 30–500-fold with an ultrafiltration filter, which allowed preconcentration of molecules with molecular masses >10000. The preconcentrated sample solution was then subjected to speciation analysis using the above combined system, where a size exclusion column with the molecular permeation range between 1000 and 300000 was used for molecular separation. In the size exclusion chromatograms obtained with UV absorption detection at 254 nm, two peaks of some large organic molecules were obtained at retention times corresponding to molecular masses of >300000 (peak 1) and about 50000–10000 (peak 2). In the chromatograms, which were measured on-line by ICP-MS, yttrium and lanthanide elements (Y, La, Ce and Pr) were found at the two peak positions corresponding to above large organic molecules.