What is the role of the persulfate digestion for the phosphate analysis?

Art Vandele

New member
a. to destroy organic matter or organically bound phosphorus in order to measure the total phosphorus in the water sample
b. avoid contamination of the water sample during transfer of the solutions
c. to accelerate colour development of the sample after addition of the vandoo molybdate reagent
d. to avoid degradation of the analyte present in the water sample prior to analysis
is it a, b, c or d? thanks guys
 
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