Heavy metals as Lead, Cadmium, Mercury, Cobalt, Copper etc. how much Nitric acid is to be added for sample to prevent precipitation
https://www.who.int/water_sanitation_health/resourcesquality/wqmchap5.pdf
For collection of water samples, polyethylene or polypropylene bottles are suitable. Sometimes, if anyone wants to estimate dissolved or dispersed silicon in collected water samples, for that, polyethylene bottles are suitable, glass bottles might give some extra silicon contamination added to the samples.
2% concentrate nitric acid should be used to reduce the chances of precipitation.
This paper contains a very straight forward protocol and goes through comparing the bottles. As a mercury scientist I will say that mercury is one of the most challenging elements to work with so if this protocol is sufficient for trace levels of Hg, it should also work for other metals. The only one to be wary of is arsenic as I know the standard practice is avoiding glass in that case.
Article Sample collection, filtration and preservation protocols for...
G. E. M. Hall
Hope this helps!
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