tailieunhanh - Handbook Of Pollution Control And Waste Minimization - Chapter 12

Giám sát In-Situ cảm biến điện hóa Electroanalytical phương pháp có liên quan với sự tương tác giữa điện và hóa học, cụ thể là, các phép đo số lượng điện như hiện tại hoặc tiềm năng và mối quan hệ của họ với các thông số hóa học. Electroanalytical hóa học có thể đóng một vai trò quan trọng trong kiểm soát ô nhiễm và phòng chống. Đặc biệt, bộ cảm biến điện hóa và thiết bị dò là rất hấp dẫn cho trang web trên và giám sát tại chỗ các chất ô nhiễm ưu tiên. Các thiết. | 12 Monitoring In-Situ Electrochemical Sensors Joseph Wang New Mexico State University Las Cruces New Mexico 1 INTRODUCTION Electroanalytical methods are concerned with the interplay between electricity and chemistry namely the measurements of electrical quantities such as current or potential and their relationship to chemical parameters. Electroanalytical chemistry can play a major role in pollution control and prevention. In particular electrochemical sensors and detectors are very attractive for on-site and in-situ monitoring of priority pollutants. Such devices are highly sensitive selective toward electroactive species fast accurate compact portable and inexpensive. Several electrochemical devices such as oxygen or pH electrodes have been widely used for years for environmental analysis. Recent advances in electrochemical sensor technology have expanded the scope of electrochemical devices toward a wide range of organic and inorganic contaminants. The present chapter reviews recent efforts at the author s laboratory aimed at in-situ monitoring of priority pollutants. Continuous monitoring effected in the natural environment offers a rapid return of the chemical information with a proper alarm in case of a sudden discharge avoids costs and errors associated with the collection of discrete samples while maintaining the sample integrity. The use of remote sensors thus has significant technical and cost benefits over Copyright 2002 by Marcel Dekker Inc. All Rights Reserved. traditional sampling and analysis. Our latest developments of remote electrochemical probes will be covered in the following sections. 2 REMOTELY DEPLOYED ELECTROCHEMICAL SENSORS Remotely deployable submersible sensors capable of monitoring contaminants in both time and location are advantageous in a variety of applications. These range from shipboard marine surveys downhole monitoring of groundwater contamination to real-time analysis of industrial streams. The development of submersible .