Disposal of Sodium Thiosulfate?
- Ian
- Posts: 575
- Joined: 16 Oct 2006, 10:00
- Job Title: Lab Assistant
- School: Macarthur Anglican School
- Suburb: Cobbitty
- State/Location: NSW
Disposal of Sodium Thiosulfate?
Dear "Brains Trust"
In the old (now extinct) CIS Appendix D, the recommended disposal for Sodium Thiosulfate was "down the sink (to the sewer). The new SDS sheet tells me that Sodium Thiosulfate is "Very toxic to aquatic organisms" and to "avoid release to the environment". So, how do people dispose of Sodium Thiosulfate these days?
Cheers
Ian
In the old (now extinct) CIS Appendix D, the recommended disposal for Sodium Thiosulfate was "down the sink (to the sewer). The new SDS sheet tells me that Sodium Thiosulfate is "Very toxic to aquatic organisms" and to "avoid release to the environment". So, how do people dispose of Sodium Thiosulfate these days?
Cheers
Ian
- Labbie
- Posts: 3259
- Joined: 28 Nov 2006, 10:00
- Job Title: Retired
- Suburb: At Home
- State/Location: NSW
Re: Disposal of Sodium Thiosulfate?
With a lot of water,
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired
- Lyn
- Posts: 709
- Joined: 16 May 2006, 10:00
- Job Title: Lab Assistant (Technician)
- School: St. John's Catholic College
- Suburb: Darwin
- State/Location: NT
Re: Disposal of Sodium Thiosulfate?
Check the ASSIST site. Yes, dilute with lots of water.
-
- Posts: 1548
- Joined: 12 Mar 2013, 08:10
- Job Title: Labbie
- School: Wollondilly Anglican College
- Suburb: Tahmoor
- State/Location: NSW
Re: Disposal of Sodium Thiosulfate?
I've just posted the specific question to Science Assist as the only guide was in an answer to a prac with sodium thiosulfate and HCl. Is this the one you saw Lyn?
We should use Science Assist more often - if we don't their funding will end.
We should use Science Assist more often - if we don't their funding will end.
- Lyn
- Posts: 709
- Joined: 16 May 2006, 10:00
- Job Title: Lab Assistant (Technician)
- School: St. John's Catholic College
- Suburb: Darwin
- State/Location: NT
Re: Disposal of Sodium Thiosulfate?
Yes that is the one I saw and although it was a combination of the two chemicals I thought the answer was relevant to your question. It will be interesting to see what the answer is to your original question. I think that if the solution of sodium thiosulfate is very weak that with further dilution it would be OK. Anyhow I'm not a chemist so we can wait and see what Science Assist has to say.
-
- Posts: 1548
- Joined: 12 Mar 2013, 08:10
- Job Title: Labbie
- School: Wollondilly Anglican College
- Suburb: Tahmoor
- State/Location: NSW
Re: Disposal of Sodium Thiosulfate?
I'm guessing the answer will be to flush it down the sink, but thought it was a good question to put to them.
- Ian
- Posts: 575
- Joined: 16 Oct 2006, 10:00
- Job Title: Lab Assistant
- School: Macarthur Anglican School
- Suburb: Cobbitty
- State/Location: NSW
Re: Disposal of Sodium Thiosulfate?
Thanks all. Yes it was the Hypo Cross reaction, (with the HCl). The Na2S2O3 was only 0.2M, and probably mostly used up in the reaction.
The Science Assist solution seems to be to filter out the precipitated sulfur and bin it, then tip the filtrate down the sink. I will give that a go. Thanks for all your help.
Ian
The Science Assist solution seems to be to filter out the precipitated sulfur and bin it, then tip the filtrate down the sink. I will give that a go. Thanks for all your help.
Ian
Sodium thiosulfate
I'm confused!! !
Needed to label some more Sodium thiosulfate containers. Prevously to subscribing to Riskassess, I've used Chemwatch. Riskassess says "not classified as hazardous", blue dot etc However Chemwatch lists it with "warning' and ' toxic to aquatic life'. Interested in any comments
Needed to label some more Sodium thiosulfate containers. Prevously to subscribing to Riskassess, I've used Chemwatch. Riskassess says "not classified as hazardous", blue dot etc However Chemwatch lists it with "warning' and ' toxic to aquatic life'. Interested in any comments
- Labbie
- Posts: 3259
- Joined: 28 Nov 2006, 10:00
- Job Title: Retired
- Suburb: At Home
- State/Location: NSW
Re: Sodium thiosulfate
sodium thiosulfate*
sodium hyposulfite
hypo
7-12
1
2
3
4
5
6
-
NR
Not Hazardous -
-
7772-98-7 Moderately toxic if ingested. Forms toxic gases on contact with acids and on heating. Photographic fixer. Used in crystallisation experiments and redox titrations. Small quantities can be sued for chemical gardens and crystal growth experiments with students Years 5-6.
Disposal: Waste solutions of this chemical may be disposed of down the sink (to sewer).
Q-Stores
15
See also PHOTOGRAPHIC CHEMICALS. This is from the Online CSIS
sodium hyposulfite
hypo
7-12
1
2
3
4
5
6
-
NR
Not Hazardous -
-
7772-98-7 Moderately toxic if ingested. Forms toxic gases on contact with acids and on heating. Photographic fixer. Used in crystallisation experiments and redox titrations. Small quantities can be sued for chemical gardens and crystal growth experiments with students Years 5-6.
Disposal: Waste solutions of this chemical may be disposed of down the sink (to sewer).
Q-Stores
15
See also PHOTOGRAPHIC CHEMICALS. This is from the Online CSIS
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired
-
- Posts: 894
- Joined: 15 Dec 2015, 10:49
- Job Title: Lab Technician
- School: FCAC
- State/Location: QLD
Re: Sodium thiosulfate
Labbie wrote: ↑12 Aug 2019, 14:04 sodium thiosulfate*
sodium hyposulfite
hypo
7-12
1
2
3
4
5
6
-
NR
Not Hazardous -
-
7772-98-7 Moderately toxic if ingested. Forms toxic gases on contact with acids and on heating. Photographic fixer. Used in crystallisation experiments and redox titrations. Small quantities can be sued for chemical gardens and crystal growth experiments with students Years 5-6.
Disposal: Waste solutions of this chemical may be disposed of down the sink (to sewer).
Q-Stores
15
See also PHOTOGRAPHIC CHEMICALS. This is from the Online CSIS
- Labbie
- Posts: 3259
- Joined: 28 Nov 2006, 10:00
- Job Title: Retired
- Suburb: At Home
- State/Location: NSW
Re: Disposal of Sodium Thiosulfate?
Oh well done Bigmack, a typo from the DoE, I did paste & Copy
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired
-
- Posts: 1548
- Joined: 12 Mar 2013, 08:10
- Job Title: Labbie
- School: Wollondilly Anglican College
- Suburb: Tahmoor
- State/Location: NSW
Re: Sodium thiosulfate
Go with the Riskassess guidelines. Chemwatch gets it wrong so many times. I have trays of 1M HCl with old Chemwatch labels (I'm gradually replacing them) with some saying non-hazardous, some corrosive and some Warning or Dangerous.astagni wrote: ↑12 Aug 2019, 13:04 I'm confused!! !
Needed to label some more Sodium thiosulfate containers. Prevously to subscribing to Riskassess, I've used Chemwatch. Riskassess says "not classified as hazardous", blue dot etc However Chemwatch lists it with "warning' and ' toxic to aquatic life'. Interested in any comments
- Labbie
- Posts: 3259
- Joined: 28 Nov 2006, 10:00
- Job Title: Retired
- Suburb: At Home
- State/Location: NSW
Re: Disposal of Sodium Thiosulfate?
If you are a private school, see your Head teacher, and get a classified answer on Riskasses or chemwatch, not both. And stick to it. If you are a DoE school you have no choice, its CSIS chemical safety in school, and that is it.
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired
- Kathryn
- Posts: 392
- Joined: 01 Jun 2006, 10:00
- Job Title: Lab Technician
- School: Cedars Christian College
- Suburb: Farmborough Hts, Wollongong
- State/Location: NSW
Re: Disposal of Sodium Thiosulfate?
I think part of the trouble with Chemwatch is they are writing SDS for large quantities as in manufacturing or industry. Using hundreds of kg's is quite different from the amounts that we use in schools.
Kathryn
Kathryn
- Labbie
- Posts: 3259
- Joined: 28 Nov 2006, 10:00
- Job Title: Retired
- Suburb: At Home
- State/Location: NSW
Re: Disposal of Sodium Thiosulfate?
This is so very true, before I retired we asked that question to chemwatch, and they said in the future they may have a part for DoE schools. But I would not hold my breath.
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired