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

[From: ] [author: ] [Date: 11-09-17] [Hit: ]
b, c or d?You need to convert all organically bound phosphate to free phosphate anions--often times, hydrolysis is slow, especially when phosphate is covalently bound to large molecules like proteins, etc.......
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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The correct answer is 1: to destroy (decompose) by oxidation organically bound phosphorus in order to measure total phosphorus in the water sample

You need to convert all organically bound phosphate to free phosphate anions--often times, hydrolysis is slow, especially when phosphate is covalently bound to large molecules like proteins, etc. Oxidation of the organic molecule speeds up the degration to smaller fragments from which hydrolysis can occur relatively rapidly.

An oxidizing agent like HNO3 can be used as well.
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