Wet Ashing

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Wet Ashing

Post by PaulC »

Regarding wet washing:
What are the functions of the three digestion reagents: HCl, HNO3 and HClO4?
And why is HClO4 not introduced until the second heating?
Why is fresh HNO3 and HClO4 added?. Why has HNO3 to be present when the reagent is treated with HClO4 treatment?
Thank you very much!
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Re: Wet Ashing

Post by ChenBeier »

Nitric acid and perchloric acid are strong oxidizers who oxidise everything to Oxides or nitrates. Hydrochloric acid change the oxides to chloride, which have good solubility in water.
The order is because Perchlorate and nitrogen compounds like ammonium are explosive, so first these compounds have to convert by nitric and others like some metals later will be treated with perchlorate.
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Re: Wet Ashing

Post by pugdistant »

Can we replace them by any reagents that's cheaper than them?
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