On-line electrochemical monitoring of (TNT) 2,4,6-trinitrotoluene in natural waters
On-line electrochemical monitoring of (TNT) 2,4,6-trinitrotoluene in natural waters
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DOI：
10.1016/s0003-2670(03)00419-7
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发表时间：
2003-06-06
影响因子：
6.2
通讯作者：
Thongngamdee, S
中科院分区：
文献类型：
--
作者：
Wang, J;Thongngamdee, S
介绍了一种用于海洋环境中痕量2,4,6-三硝基甲苯（TNT）在线监测的电化学流动系统，该系统基于碳纤维探测器的方波伏安操作。该系统可选择性测量未经处理的海水基质中TNT的亚ppm浓度（检测限为25 ppb）。它对TNT浓度的突然变化反应迅速，没有可观察到的结转。每小时可运行约600次，重现性高（如rsd = 2.3%, n = 40），稳定性好。计算机化的基线减法提供了对氧背景贡献的有效补偿。对未经处理的河水样品中TNT的在线监测具有良好的灵敏度和稳定性。该系统可实现完全自动化，并可部署到各种移动平台上。伏安流量检测通过满足高灵敏度、选择性、稳定性、便携性和低成本的需求，为现场筛选作业提供了巨大的希望，这些作业旨在表征和修复未爆弹药（UXO）污染的水下地点。(C) 2003 Elsevier Science B.V.版权所有
An electrochemical flow system for on-line monitoring of trace 2,4,6-trinitrotoluene (TNT) in marine environments, based on a square-wave voltammetric operation at a carbon-fiber based detector, is described. The system offers selective measurements of sub-ppm concentrations of TNT in untreated seawater matrix (with a detection limit of 25 ppb). It responds rapidly to sudden changes in the TNT concentration with no observable carry-over. About 600 runs can be made every hour with high reproducibility (e.g. R.S.D. = 2.3%, n = 40) and stability. A computerized baseline subtraction offers effective compensation of the oxygen background contribution. Good sensitivity and stability is illustrated also for on-line monitoring of TNT in untreated river water samples. The system lends itself to full automation and to deployment onto various mobile platforms. By meeting the high-sensitivity, selectivity, stability, portability and low-cost demands, such as voltammetric flow detection holds great promise for field-based screening operations aimed at characterizing and remediating unexploded ordnance (UXO) contaminated underwater sites. (C) 2003 Elsevier Science B.V. All rights reserved.