Depending on the nature of the pollutants, environmental analysis methods can be classified into ten categories as follows: physical testing, analysis of air, water, soil, wastes, toxicants, public health pesticides, biologically accumulating toxicants, environmental biological tests, biotoxicology analysis and others. The EAL has established standard environmental methods based on these categories and 400 environmental methods have become standard during recent years. As unified testing procedures, these standard methods are followed by the accredited laboratories to ensure consistent test data quality. 

                                    

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