Method 365.3: Phosphorous, All Forms (Colorimetric ...
8.2.3 Treat the samples as in 8.1.3. 8.2.4 Determine phosphorus as outlined in (8.3) orthophosphate. 8.3 Orthophosphate 8.3.1 To 50 mL of sample and/or standards, add 1 mL of 11 N sulfuric acid
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