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EPA Methods
The United States Environmental Protection Agency (EPA) maintains test methods, which are approved procedures for measuring the presence and concentration of physical and chemical pollutants; evaluating properties, such as toxic properties, of chemical substances; or measuring the effects of substances under various conditions. The methods in the Agency index are known as EPA Methods.〔http://www.epa.gov/region01/info/testmethods/pdfs/testmeth.pdf〕 There are other types of methods such as the ASTM and United States Pharmacopeia, but the EPA Methods are the most widely accepted and used.
==Nomenclature==
The method numbers generally range from 1 to 9000 and may have modification letters appended to the end, signifying a newer version of the method has been released. Some ranges of numbers appear to be organized with intention, for example methods 1-99 being air methods or the 7000s being for hazardous waste.〔http://www.epa.gov/osw/hazard/testmethods/sw846/online/7_series.htm〕 Others number ranges, however, seem to only contain random methods, like the 300 and 400 series both being for wet chemistry methods.〔http://www.caslab.com/EPA-Methods-300-Series/〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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