Determintion of Mo in fertilisers according to colorimetric method (using Ferrous Ammonium Sulphate, SnCl2, Potassium Thio-cyanate and Isoamyl alcohol, phase separation method) is a cumbersome process.
Further Determination of Mo by AAS doesn't give much accurate result....as Mo being an anion.
Therefore I used the similar colorimetric method used for determination of available phosphate from soil. The difference is that in case of phosphate standard P solutions were treated with Mo used as complexing reagent following the addition of SnCl2. In my method I have used standard Mo solutions with fix P solution (prior to testing of appropriate strength) followed by SnCl2. I got results quite comparable with colorimetric method of phase separation.
Please suggest if any problem in performing this methods.
sounds good, but you should cross check the results either with ICP-MS or test it on SRM´s!
I have not used this approach but others tell me that it works. An ASM would be good if you can get one, and I'd like to hear your experience.
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