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Why sulfuric acid is used in sulphated ash / residue on
ignition test.
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Answer Posted / aamir sohail
it converts most of the metals into their sulphates but not all like phosphorus does not converted into sulphates it remain same till the end of the test, than these metal sulphates further proceed for heavy metal test that how much amount of which metal present in it...
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I have compare C2H2-air and C2H2-N2O flame AAS on determination calcium. Both use same range of std to plot calibration curve. (2-6ppm) When i measure the sample with phosphate, KCl and LaCl, C2H2-N2O flame give false positive result, around 0.5ppm. When i measure the sample with phosphste, KCl and EDTA. C2H2-N2O flame also give 0.5ppm false positive. But both above mentioned sample would not give false positive when measured by C2H2-air flame. What is the reason?
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