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Topic: phosphorus  (Read 4998 times)

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Offline abcc

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phosphorus
« on: December 10, 2006, 03:39:14 PM »
what are the methods to analyse phosphorus content in plant food?
any suggestions  ???
thx ;)
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Offline Alberto_Kravina

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Re: phosphorus
« Reply #1 on: December 10, 2006, 03:51:24 PM »
You can analyze the phosphate quantity with a gravimetric method by precipitating the Phosphate as Ammonium Magnesium phosphate, which is converted to Mg-Pyrophosphate by roasting, then, you can easily calculate the phosphate content.
Also, I think that it is possible to determine the content by photometry (Phosphate forms a yellow complex with ammonium Heptamolybtate, AFAIR)...
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Offline abcc

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Re: phosphorus
« Reply #2 on: December 10, 2006, 08:49:59 PM »
Quote from: Alberto_Kravina on December 10, 2006, 03:51:24 PM
You can analyze the phosphate quantity with a gravimetric method by precipitating the Phosphate as Ammonium Magnesium phosphate, which is converted to Mg-Pyrophosphate by roasting, then, you can easily calculate the phosphate content.
Also, I think that it is possible to determine the content by photometry (Phosphate forms a yellow complex with ammonium Heptamolybtate, AFAIR)...
beside this one, any other methods?
thxq
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Offline natrium

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Re: phosphorus
« Reply #3 on: December 15, 2006, 11:49:30 AM »

You should check the Official Methods of Analysis from the AOAC.... It is really useful and I am sure you

can find what you are looking for... It is always available at the library...


I hope this helps you  :)
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