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Author: Subject: Addition of nitric acid as a preservative
mustie
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[*] posted on 16-10-2004 at 11:25
Addition of nitric acid as a preservative

Text
I'm wondering why we add nitric acid as a
preservative in Total metal digestion method (Environmental science)?
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JohnWW
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[*] posted on 17-10-2004 at 19:00


Are you talking about samples of natural and effluent waters, to be used for chemical analysis of metals present? You would certainly need something like HNO3, to maintain the metals in solution against precipitation as insoluble hydroxides due to high pHs, adsorption onto the walls of the sample bottles, and metabolism by algae.
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mustie
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[*] posted on 18-10-2004 at 23:41


Thanks John,
yeah.. i m talking about natural water (samples of drinking water).
.. excellent explanation

[Edited on 19-10-2004 by mustie]
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