Method 365.1, Revision 2.0: Determination of Phosphorus by …
1.1 This method covers the determination of specified forms of phosphorus in ... ion. Thus, depending on the prescribed pretreatment of the sample, the various forms of phosphorus that may be determined are defined in Section ... a sample filtered through a phosphorus-free filter of 0.45 micron pore size and measured by the persulfate digestion ...
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