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9:17 Contamina4on from Reagents

Other Reagents:

§ The "purity" situa.on for salts and other reagents is typically not as favorable as it is for water and acids. § Typically, the highest purity solid that can be confirmed is 99.999% (5-9's or TMI 10ppm). This translates to 100 ppb total impuri.es for a 100 fold dilu.on (i.e. - 1 g of 5-9's pure reagent into 100 mL of solu.on). § § We recommend that you know your supplier's defini.on of "high purity". § DO NOT use solid reagent grade materials when preparing samples for trace metals analysis whenever possible.

9:18 Contamination from Reagents

High Purity Acids

If necessary, a blank should be performed to confirm the acceptability of reagents(s) or to iden;fy problem elements / impuri;es.

Purifica;on of unacceptable reagents may be accomplished by mercury cathode electrolysis, extrac;on with dithiozone or cupferron, ion-exchange, or crystalliza;on.