Transcription of Water sampling and analysis - WHO
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Water sampling and analysis - WHO
4. Water sampling AND sampling and analysisIdeally, a laboratory infrastructure should be established which will enable allsamples to be returned to a central or regional laboratory within a few hours ofbeing taken. However, this depends on the availability of a good road system andof reliable motorized transport for all sampling officers, and these are not availablein many countries. Thus, although it may be possible to establish well-equippedcentral and even regional laboratories for Water analysis , at the provincial anddistrict levels it may be necessary to rely on a relatively small number of simpletests. As noted in Chapter 1, this approach is sometimes called critical-parameterwater most important factor to take into account is that, in most communities,the principal risk to human health derives from faecal contamination. In somecountries there may also be hazards associated with specific chemical contami-nants such as fluoride or arsenic, but the levels of these substances are unlikely tochange significantly with time.
GUIDELINES FOR DRINKING-WATER QUALITY 54 Table 4.1 Minimum frequency of sampling and analysis of unpiped water supplies Source and mode of supply Minimum frequency of sampling and analysis Remarks Bacteriological Physical/chemical Open wells for community supply Sanitary protection measures; Once initially for …
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