Yellow EDTA ph8, 0.5M

Han via methods%40net.bio.net (by nobody from nospam.not)
Wed Jul 23 05:59:48 EST 2008


chovek69 <ivanoov from gmail.com> wrote in
news:dfae68a1-9aa7-4648-8578-f1f5e555295e from b1g2000hsg.googlegroups.com: 

> On Jul 21, 9:55 pm, Sharon Rho <janshar... from yahoo.com> wrote:
>> Has anyone had problems with EDTA turning a clear yellow solution? I
>> us 
> ed the same protocol that others in the lab used: 186.1 g of EDTA, add
> 500 ml of distilled water, then add NaOH pellets until a pH of 8 is
> reached...but it still turns out yellow. Does anyone know how to solve
> the problem? Thanks. 
>>  
> 
> I suppose the EDTA powder is old...Is it clearly white or is
> yellowish ?
> 
Or there is tea in the system, or the NaOH pellets were really old ...


-- 
Best regards
Han 
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