Unit 7. Obsolete Pesticides. Sampling and Analytical Procedures.

The following topic is called “Obsolete pesticides. Sampling and analytical procedures”. The first stage in addressing chemical pollution, in different environmental media, involves sampling and analysis, to understand the nature of the pollution, its extent, and potential effects. A well thought out sampling and analysis plan tell you whatwherewhen and how to collect samples, and defines procedures for analyzing the samples once they have been collected. Discussed are, the environmental properties of some obsolete pesticides, because this information helps to understand, pollutant movement in the environment, and the types of environmental media, that should be sampled. Presented are the different approaches of sampling procedures, together with graphic images: Preliminary Search sampling, Judgemental sampling, Systematic sampling, Random sampling and Stratified sampling. Briefly are discussed the analytical procedures, methods and technics in order to perform precision chemical analyses of the samples. 

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