On-line determination of silver in natural waters by inductively-coupled plasma mass spectrometry: Influence of organic matter
On-line determination of silver in natural waters by inductively-coupled plasma mass spectrometry: Influence of organic matter
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DOI：
10.1016/j.marchem.2005.07.003
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发表时间：
2006-02-01
期刊：
影响因子：
3
通讯作者：
Flegal, AR
中科院分区：
文献类型：
--
作者：
Ndung'u, K;Ranville, MA;Flegal, AR
研究了干扰对高分辨电感耦合等离子体质谱（ICP-MS）分析河口和大洋沃茨中银的影响。用强阴离子交换树脂填充的微型柱在流动注射系统中使用Dowex 1-X8分离富集盐水样品中的银，然后用ICP-MS在线测定。一系列分析表明，在圣弗朗西斯科湾口和北太平洋中，经酸化（pH < 2）保存1-2年的样品中，银的含量为10- 70低于在紫外线（UV）照射后在这些样品的等分试样中测量的那些。额外的银释放后，紫外线照射的河口沃茨，但不是海洋沃茨，正相关（r=0.77，简单的线性相关）与叶绿素a浓度，但不与溶解有机碳（DOC）浓度。叶绿素a和紫外线释放的银的空间分布也表现出类似的模式沿着盐度梯度在弗朗西斯科湾河口，这表明在原位生物源的银测量的盐度。(c)2005 Elsevier B. V.保留所有权利。
We investigated interference effects on the analysis of silver in estuarine and oceanic waters using on-line high resolution inductively coupled plasma mass spectrometry (ICP-MS). A mini-column packed with a strong anion exchange resin (Dowex 1-X8) was used in a flow-injection system to separate and concentrate silver from the saline samples prior to on-line determination by ICP-MS. A series of analyses showed the concentrations of silver measured in San Francisco Bay estuary and the North Pacific that had been acidified (pH < 2) and stored for periods of 1-2 years were 10-70% lower than those measured in aliquots of those samples after ultraviolet (UV) irradiation. Additional silver released after UV irradiation of the estuarine waters, but not the ocean waters, was positively correlated (r=0.77, simple linear correlation) with chlorophyll-a concentrations, but not with dissolved organic carbon (DOC) concentrations. Spatial distributions of chlorophyll-a and UV-released silver also exhibited similar patterns along a salinity gradient in the San Francisco Bay estuary, suggesting an in situ biogenic Source of the interferent for the silver measurements. (c) 2005 Elsevier B.V. All rights reserved.