I want to observe how much arsenite and arsenate concentration in an effluent of water after being filtered. Should I use shieves (which I have to know first the particle size of both) or is there supposed to be another method to observe?
Thank you
Dear Abyzhar Gibran,
I have worked with Arsenic a lot and I was stuck in this limbo too. These are ions and sieves are out of question (I guess you didn't do your homework).
You must try to convert AsO3−4 (Arsenate) to Arsenite and then quantify. The easiest way is to convert the entire thing into Arsenate from the effluent and then quantify. First determine the Arsenate concentration directly (I would say relay on anion membrane selective electrode)... However, bear in mind it is extremely tedious job. Fiddle a little and the error is too much to handle. Get this article. It might help you.
Determination of arsenate in water by anion selective membrane electrode using polyurethane-silica gel fibrous anion exchanger composite..
Best Wishes...
Arif's solution is quite tedious and highly unnecessary. You can easily separate arsenate and arsenite using ion chromatography. We couple ours with ICP-MS so that we can see sub-ppb concentrations, but conventional IC will work just fine for mid-level ppb ranges.
Here is a good paper you might be interested in. A Fast, Accurate, Speciation-Capable, Automated, and Green Gas-Phase Chemiluminescence Approach for Analyzing Waterborne Arsenic: http://www.chromatographyonline.com/fast-accurate-speciation-capable-automated-and-green-gas-phase-chemiluminescence-approach-analyzing?pageID=1
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