Quantifying P or PO4 in an unknown solid

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Discussion Overview

The discussion revolves around methods for accurately measuring phosphorus (P) or phosphate (PO4) content in an unknown solid sample, potentially containing various phosphate salts from a precipitation reaction. The focus is on analytical techniques applicable to solid samples.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about possible methods for measuring P or PO4 in a solid sample, emphasizing their concern with phosphorus content.
  • Another participant suggests dissolving the phosphate and mentions colorimetric assays as a viable method for measuring phosphate concentration in solution.
  • A third participant echoes the suggestion of dissolving the phosphate but also proposes that there may be more accurate analytical methods available for quantifying P or PO4 in solid form.
  • A fourth participant describes a standard approach used in steel analysis, which involves dissolving the sample, oxidizing P to PO43-, and determining it using ammonium molybdophosphate or colorimetric assays.

Areas of Agreement / Disagreement

Participants express various methods for measuring phosphorus content, but no consensus is reached on the best approach. Multiple competing views on the accuracy and applicability of different methods remain present.

Contextual Notes

Participants discuss the potential need for dissolution of the solid sample and the accuracy of different analytical techniques, but specific limitations or assumptions regarding the methods are not fully explored.

Who May Find This Useful

Researchers or practitioners interested in analytical chemistry, particularly those focused on phosphorus measurement in solid samples, may find this discussion relevant.

Baho Ilok
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I have a solid sample possibly containing a few species of phosphate salts from a precipitation reaction. I am only concerned with the phosphorus in the solid sample. What are the possible methods of accurately measuring the P or PO4 content in the solid? Thank you!
 
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Ygggdrasil said:
Can you dissolve the phosphate? There are some nice colorimetric assays for measuring the concentration of phosphate in solution: for example, http://www.sciencedirect.com/science/article/pii/0076687966080145
Yes I have also thought of this but I also thought maybe there are other possibly more accurate methods using some analytical instruments that can quantify the P or PO4 in a solid.

Anyway, thank you for your insight. I really appreciate it!
 
Standard approach in the analysis of steel was to dissolve the steel sample, oxidize P to PO43- and to determine it as the ammonium molybdophosphate (or with a colorimetric assay, as Ygg suggested).
 

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