How long phosphorus fractions measurement can be delayed after sampling?
Can the passage of time change the phosphorus fractions (AL-P, Ca-P, Fe-P, available phosphorus, and OP) in the dried samples?
In the articles I have read so far, it is not mentioned that the maximum time interval between sampling, sample drying, and measurement of phosphorus fractions should be a few hours or a few days. Can anyone guide me on this? Is there an article that mentions this topic?
Is the material soil?
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The main inorganic P pools in soils are relatively stable in dry samples at room temperature and that period can be extended at freezer temperature.
Be aware that the 'fractions' are operationally defined rather than physically real.
Thanks for your response
Can you introduce me to a reference in this subject? In what I have read so far, it is only said that the sample was dried by a freezer or temperature and kept in the refrigerator until the fractions were measured (No time is specified).
I did not understand your second sentence 'fractions are operationally defined rather than physically real".
Once freeze dried, the inorganic pools of P should be fairly stable. OP (organic P) can be affected by time and temperatures.
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