Preparation of Bismuth-EDTA complex
Mohammed Farooq
and EDTA. I would be using pure ethylenediaminetetraacetic acid
(solubility 0.5g/L in water) not its disodium salt becasue I do not
want to introduce sodium ions in my solution for a specific purpose.
Though bismuth nitrate immediately decomposes in water but in a
slightly acidic media (acidified by nitric acid) the solution is
stable for some time.
Could someone give me the optimum conditions eg pH, concentration,
temperature etc for the formation of bismuth-EDTA complex ( I only
need its aqueous solution). I have checked my resources but couldn't
find specific information on preparing Bi-EDTA complex.
Thanks.
Gregg
"Mohammed Farooq" <faro...@hotmail.com> wrote in message
news:66756669.04061...@posting.google.com...
metal ions -EDTA and % complexion vs. pH graphs..
Give me a day or two and I should be able to dig it up. I think Bi is
listed.
Gregg
Mohammed Farooq
Can you give me the reference to the paper, in case you don't get time
to dig up the information: I will see if that journal is available in
our library.
SNUMBER6
>Can you give me the reference to the paper, in case you don't get time
>to dig up the information: I will see if that journal is available in
>our library.
Britzinger and Hesse
Z. anorg. Chem 256 65-74 (1948)
is supposedly all about EDTA complexes with Bi included ...
From "The Analytical Uses of Ethylenediaminetetraacetic acid" by Frank Welcher
(1957) ...
> > Could someone give me the optimum conditions eg pH, concentration,
> > temperature etc for the formation of bismuth-EDTA complex ( I only
> > need its aqueous solution).
Direct Titration with Pyrogallol Red Indicator
done at pH 2-3 at 0.8 g/L Bi
with Pyrocatechol Violet
done at pH 2-3 at 0.8 g/L Bi (different reference from the previous one)
Both procedures used the disodium salt ... and give Ferric Ion as the main
common interference ...
Based on all this I would imagine that a pH of at least 2 and around 1 g/L Bi
would be viable ...
Be seeing you
In the Village
Number 6
Mohammed Farooq
>>Can you give me the reference to the paper, in case you don't get
time
>>to dig up the information: I will see if that journal is available
in
>>our library.
>Britzinger and Hesse
>Z. anorg. Chem 256 65-74 (1948)
>is supposedly all about EDTA complexes with Bi included ...
Thank you SNUMBER, but sometimes but sometimes I feel so
frustrated... even our (supposedly) best research institute of
chemistry in country does not suscribe to Z. anorg. Chem, though I
found some dust-laden issues of only 1960s in old (no one seems to
have touched it for years) book shelf. Even if the article is German I
would have tried to get the gist with the help of a dictionary.
>From "The Analytical Uses of Ethylenediaminetetraacetic acid" by
Frank >Welcher
>(1957) ...
Seems like I have seen the title, I will check this one too.
> > Could someone give me the optimum conditions eg pH, concentration,
> > temperature etc for the formation of bismuth-EDTA complex ( I only
> > need its aqueous solution).
>Direct Titration with Pyrogallol Red Indicator
>done at pH 2-3 at 0.8 g/L Bi
>with Pyrocatechol Violet
>done at pH 2-3 at 0.8 g/L Bi (different reference from the previous
one)
>Both procedures used the disodium salt ... and give Ferric Ion as the
main
>common interference ...
>Based on all this I would imagine that a pH of at least 2 and around
1 g/L Bi
>would be viable ...
Thanks again; I was not doing this analytical purpose, rather I wanted
Bismuth-EDTA complex for adsorption studies on sulfuric acid activated
carbon. Bismuth at very low conc. ie at 10 ppm Bi showed 100 percent
adsorption on it... very good... but when I checked the Chemical
Abstracts for the WHOLE CENTURY only two Russian papers had work on
adsorption of bismuth onto activated carbons from HCl solutions. The
purpose of using H4-EDTA was to have less interfering ions in the
solution and see the effect of complexation on adsorption.