We generally use HNO3 for the digestion of most of the metals in effluent waters. But for digestion of As containing waters, we always put HCl. Why ????
In my opinion, to avoid precipitation and maintain or reduce of pH level.
In my opinion, to avoid precipitation and maintain or reduce of pH level.
Dear Rabbul,
Who is 'we'? I never 'digest' As-containing water; why would one?
Acidification of water samples is typically done with HNO3 because analysis may be done by ICP-QMS, and Cl forms more interfering species than does HNO3 for that method.
I seldom use HCl to dissolve solid samples unless I am trying to dissolve Fe or a few other exotics such as Sn or Ti , which like a bit of help from HCl.
I think it's because the oxidation of HNO3 might change the valence of As.
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