IN-SITU SPECIATION MEASUREMENTS OF TRACE COMPONENTS IN NATURAL-WATERS USING THIN-FILM GELS
IN-SITU SPECIATION MEASUREMENTS OF TRACE COMPONENTS IN NATURAL-WATERS USING THIN-FILM GELS
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DOI：
10.1038/367546a0
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发表时间：
1994-02-10
期刊：
影响因子：
64.8
通讯作者：
ZHANG, H
中科院分区：
文献类型：
--
作者：
DAVISON, W;ZHANG, H
可靠地测量自然沃茨中的痕量物质对于污染或痕量元素循环的研究是必不可少的，但很困难，部分原因是化学物质的分布在采样和储存过程中经常发生变化1。现场测量可以克服这些问题，但以前进行的少数测量涉及复杂的系统，不能重复使用1，2。在这里，我们描述了一种简单的技术，用于测量痕量金属浓度在现场的水。该技术结合了离子交换树脂，通过离子渗透凝胶膜与溶液分离。通过凝胶的质量传输是扩散控制的，因此定义明确，使得可以在相对较短的时间内（从一小时到几周）获得浓度和形态的定量数据。我们提出了使用这种技术，同意与电化学测量海水中的锌浓度的测量。原则上，我们的技术应该适用于任何无机或有机扩散物种。
RELIABLE measurement of trace species in natural waters is essential for studies of pollution or trace-element cycling, but is difficult, partly because the distribution of chemical species often changes during sampling and storage1. In situ measurements can overcome these problems, but the few measurements made previously have involved complicated systems that cannot be used routinely1,2. Here we describe a simple technique for measuring trace-metal concentrations in situ in water. The technique incorporates an ion-exchange resin separated from the solution by an ion-permeable gel membrane. Mass transport through the gel is diffusion-controlled and thus well defined, making it possible to obtain quantitative data on concentration and speciation over relatively short time periods (from one hour to several weeks). We present measurements of zinc concentrations in sea water using this technique which agree well with electrochemical measurements. In principle, our technique should be applicable to any inorganic or organic diffusing species.