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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: abcc on December 10, 2006, 03:39:14 PM

Title: phosphorus
Post by: abcc on December 10, 2006, 03:39:14 PM

what are the methods to analyse phosphorus content in plant food?
any suggestions  ???
thx ;)

Title: Re: phosphorus
Post by: 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)...

Title: Re: phosphorus
Post by: abcc 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

Title: Re: phosphorus
Post by: natrium 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  :)