Re: ferro selenium analysis

>From: mikelln [EMAIL PROTECTED] 

>This sounds a rather "old method",

Most of these official methods are ...
Also the official USP grades ... based on 75 year old problems ...Our USP grade
is often the lowest purity for heavy metals ... but something immaterial as a
Sodium salt contamination would reject it ...

>As I have acces to other determination systems (ICP, AAS, ...) so my big
>concern
>is for sample dissolution.
>
>Are you sure this nitric + other acids  and cooking are well adapted for
>Selenium
>ferro alloy ?

I believe so ... once the Nitric Dissolution is done ... the Se exists as a
selenate ... and no H2Se is formed ... The Perchlorate step seems done to get
Cr present to Chromate ... if absent, I'd skip it ...
In a similar vein ... I know dissolving Silver Sulfide in Nitric releases no
H2S ...but converts all the S to sulfate ...


Be seeing you
In the Village
Number 6