Transcription of Chapter 6 - FIELD TESTING METHODS
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Chapter 6 - FIELD TESTING METHODS
Water Quality Monitoring - A Practical Guide to the Design and Implementation of Freshwater Quality Studies and Monitoring Programmes Edited by Jamie Bartram and Richard Ballance Published on behalf of United Nations Environment Programme and the World Health Organization 1996 UNEP/WHO ISBN 0 419 22320 7 (Hbk) 0 419 21730 4 (Pbk) Chapter 6 - FIELD TESTING METHODS This Chapter was prepared by R. Ballance Analyses for many important physical, chemical and microbiological variables can be carried out in the FIELD using apparatus made specifically for FIELD use. A significant advantage of FIELD analysis is that tests are carried out on fresh samples whose characteristics have not been contaminated or otherwise changed as a result of storage in a container. This is of special importance for samples that are to undergo microbiological analysis but cannot be transported to a laboratory within the time limits or under the conditions described in Chapter 5.
6.1 Temperature Temperature must be measured in situ because a water sample will gradually reach the same temperature as the surrounding air. If it is not possible to measure the temperature in situ, a sample must be taken from the correct location and depth of the sampling station and its temperature measured immediately it is brought to the surface.
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