Australia's Science Forum

Good Morning Chemtalk Family,
I was wondering if anyone could recommend a way to clean sintered glass gooch type crucibles of a porosity of 3? They were used to quantitatively determine the amount of sulfates in fertiliser.
Thanks in advance for any help,
Regards,
Lou P.

Hi There, We just did that prac here and I just clean them with hot soapy water and then soak them in a container of plain water ,after a few days I turn them upside down and fill the small area that is now at the top with water - it drains through eventually and I refill it a couple of times - it seems to flush everything out - no complaints from the chemistry teacher in the last few yaers anyway. By the way how did that prac go?? regards Louie

Loopy wrote:Good Morning Chemtalk Family,
I was wondering if anyone could recommend a way to clean sintered glass gooch type crucibles of a porosity of 3?
Lou P.

OK, I admit that after 18 months in the job, I am STILL a "Newbie", but what the dickens is a "sintered glass gooch type crucible"?

Ian

Hi Ian and Louie,
I, too, am only 18 months into this job and had no idea what these type of crucibles were until I was asked to price them late last year! Sintered glassware is used for the filtration of liquid and gases. It incorporates a porous glass disc as a filter media which is non-corrosive and reuseable. Best way I found to understand them was to "Google" them.
Thanks Louie for your advice, I will see how the crucibles go using your technique. The experiment went very well but after looking on the net and some sites recommending washing/percolating with conc. HNO₃ and other nasties I was beginning to think these crucibles are gonna mean a bit of work for me!
Regards,
Lou P.

Not sure if this is any help to you, but our Chem. teacher is using titration method to determine sulfate in fertiliser.
It is dead easy to prepare. It uses magnesium sulfate as fertiliser and barium chloride (0.05M) as the standard solution.
If you want the method, give me your fax number and I will fax it to you.
It comes from Chemical Monitoring and Management by Catalyst Teaching Resources. This practical is Investigation 12.
Happy labbing

Hi Lada,
I would love a copy of your prac. The sintered glass one never quite works the way it should for us, yours sounds much easier. My fax number is (02)9808 2642.
Thanks Tracey

Hi tracey, did you get that method?

Hey Lada,
I would appreciate a copy of the prac. Our fax number here is (02) 69225659. Just mark it as ATTENTION: Louise
Many thanks,
Lou P.

Hi Lada,
I'd love a copy of the the titration prac as well.
Using the crucibles has always been a hit or miss. It was greatly improved last year with the use of gooch rubber sleeves but still doesn't solve the washing up issue.

Please send to fax: 02 9684 2120 Attn: Josie.

Thanks.

hi lada

Sorry to be a nuisance, but could I also please get a copy of the titration prac. I was looking to buy the sintered glass crucibles, but it seems they may not be all that wonderful, from the various posts on the subject. Fax number here is 02 67424429 or put on here if easier. Hope it is not too much trouble. Thanking you

Hi Lada,
Thanks very much for the prac. As it turns, out my boss said the one he used wasn't very successful and was grateful to see yours.
Cheers,
Lou P.

Hi Iada,
Yes I did get your fax. I had a quick look and it sounds good. Sorry I haven't replied earlier but time has been getting away from me.The Chem teacher is very interested, thanks for sharing it. Isn't this forum great.
Thanks again Tracey

Hi Lada
Thank you very much for your prompt fax. Have handed it on to the chem teacher. Think I'll put a hold on the sintered glass crucibles, as this method does look better, and buy some alizarin red instead. Thanks again.

Hi I was wondering if i could get a fax as well
Fax No 43931157 attention Mary
Thank You.
Mary

Hi I would appreciate a copy of the prac as well. we are doing that one next week I think.
026672 6056 Attention Estelle on it.
Thanks
Estelle

Hi, I know this is an old post. But if I can could I please have a fax or email regarding this prac. Fax number 02 9823 7662 email is susan.rowley1@det.nsw.edu.au

Thank you so much.

Also has any one found a place to purchase the Sintered Glass filter's, see Science Supply AUs has some in 2007 for $30.36