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Chemical Stability and Compatibility - Stability of mercury (Hg) in plastic bottles

 
I am curious about Inorganic Ventures' stability studies, and wondering how stable a 10 µg/mL Hg solution would be after it's been kept in a plastic bottle for 5 weeks. I also would like to know what the correlation between Hg concentration and stability would be.
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We have been measuring the stability of Hg at various levels in plastic for some time. We have found the stability of 10 ppm Hg standards in plastic to be good for at least 5 months in both borosilicate glass and LDPE in a water / 5% abs. nitric acid matrix.Be advised that we have seen instability at lower levels and have shown ppb levels to be stable in nitric acid for periods insufficient to obtain reliable measurements. We believe that HCl and aqua regia matrices are better for Hg than straight nitric acid. We've been able to demonstrate stability for 1000 ppb Hg in nitric acid, but have found a dependence upon the level of nitric acid as well as upon other elements present. For example, some organic acids mixed with Hg in nitric acid appear to reduce the Hg to the elemental state, causing the readings by ICP to be false high. More information is available on our website athttp://inorganicventures.com/mercury-chemical-stability.

Posted: 09/03/18 22:14:51

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