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Topic: organic mineral testing  (Read 3918 times)

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Offline ganesh2gig

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organic mineral testing
« on: November 22, 2010, 09:36:17 PM »
hello

i have a matrix , where there is organic mineral complex (mineral with amino acid chelation )

i am supposed to quantify the mineral proteinate in it .


it contains zinc, iron,selenium,chromium,copper,iron and manganese all proteinates .


is there a method where i can quantify them as proteinates .


right now i am ashing the sample and quantifying each separately

i only have a spectrophotometer at my dispense , so i have to work with a limited resource .

and does anybody have a procedure to separate chromium from the matrix .

any information will be really helpful .


Offline ganesh2gig

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Re: organic mineral testing
« Reply #1 on: November 25, 2010, 11:42:06 PM »
can i use EDTA to block interfering elements .

how do i find out at what ph can i block each specific element ?

right now iron is by phenanthroline method , copper by dithiocarbamate method and chromium by diphenycarbazide method .

when i did this , cu interferes with fe testing , so had to remove cu .

but does fe interfers while testing of chromium .

and the second issue is chromium is oxidation state 3 have to convert to 6 , doing this by ammonium persulfate method .

 

Offline ganesh2gig

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Re: organic mineral testing
« Reply #2 on: November 29, 2010, 01:38:53 AM »
so far to remove iron , phosphoric acid is not giving promising result .

tetra sodium pyrophosphate can it be used to bind iron ?


Offline cil-baha

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Re: organic mineral testing
« Reply #3 on: December 03, 2010, 11:22:02 AM »

Offline ganesh2gig

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Re: organic mineral testing
« Reply #4 on: December 03, 2010, 08:22:55 PM »
thanks for the info , my question is there a method to quantify it as proteinates in a mixture

Offline cil-baha

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Re: organic mineral testing
« Reply #5 on: December 05, 2010, 11:42:34 AM »
Sorry, I don't work with proteinates (yet), I thought you were developing a method and asking for help with complexing different proteinates, which is seen in the link.

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