reactofurnace
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Chemical tests for heavy metals
Guys i'm working on testing various water samples.
Are there viable tests for: (preferably in low concentrations but once it has a distinctive qualitative result)
1) Mercury(I & II)
2) Lead
3) Cadmium
4) Manganese
5) Chromium
If possible using lab reagents.
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Sulaiman
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eBay ?
https://www.ebay.co.uk/itm/Heavy-Metals-Water-Test-Strips-Co...
https://www.ebay.co.uk/itm/Heavy-Metals-Water-Test-Kit-Test-...
CAUTION : Hobby Chemist, not Professional or even Amateur
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unionised
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How much money do you have?
How good a detection limit do you need?
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Bedlasky
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Mercury(I) salts have white insoluble chloride. If you add ammonia to mercury(I) chloride precipitate turns to black do to formation of elementar
mercury.
Mercury(II) salts have orange iodide solube in excess of iodide.
Cadmium(II) have yellow-orange sulfide.
Manganese(II) is oxidized by sodium hypochlorite in slightly basic media to purple permanganate
Chromium(III) is oxidized by sodium hypochlorite or hydrogen peroxide in basic media to yellow chromate
But this is only simple tests.
[Edited on 25-6-2019 by Bedlasky]
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Metacelsus
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I'd expect the limit of detection of those tests to be well above the level of dangerous toxicity. Mercury has a drinking water limit of 2 ppb, which
is certainly not detectable by the methods of qualitative inorganic analysis.
I would suggest ICP-AES. It's not exactly amateur friendly, but this kind of thing is best left to professionals.
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