This European Standard specifies a procedure for complete digestion of raw/digested sludge, suitable for the
subsequent determination of phosphorus.
NOTE Phosphorus in environmental samples can be present in many forms. This method of pre-treatment enables
the analyst to determine all forms - i.e. total phosphorus, by quantitative oxidation yielding an aqueous solution of
orthophosphate which should be analysed for phosphate according to method EN ISO 6878, EN ISO 10304~2 or an
equivalent validated method.
The range of the method is up to 50 g/kg P assuming appropriate dilution of the digest in the final
measurement step.