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Hazards of Sodium hydrosulphite (dithionite)



2003

Q. I am querying the hazard classifications for sodium hydrosulphite. The MSDS from various sources have clearly stated that the material is flammable, is susceptible to spontaneous combustion, water reactive.

I personally have not experienced any of this behaviour working with the material when reducing chrome 6+ to chrome 3+ at high pH.

Has anybody actually seen this behaviour when using this material? And if so, under what conditions?

Roman Haraburda
- Birmingham, West Midlands, United Kingdom



2003

A. Believe the warnings.

The danger occurs with small additions of water to the bulk such as rain or a water hose squirting and getting into an open package when there will be heat build up leading to flame and sulphurous fumes.

Geoffrey Whitelaw
Geoffrey Whitelaw
- Port Melbourne, Australia



2007

A. Sodium hydrosulphite can catch fire if exposed to moisture and fine spray of water. We use hydrosulphite in bulk and I had the experience of minor fire several times and major fire twice.
The root cause for fire is moisture or water falling on drums.
Once fuming is started, it is difficult to approach the area due to SO2 gas formed.

shajan [last name deleted for privacy by Editor]
- Kerala, India




Quantitative Estimation of Sodium Hydrosulphite

wikipedia
Sodium dithionite /
Sodium hydrosulphite

January 18, 2008

Q. Can anybody please give me some information on quantitative estimation of Sodium Hydrosulphite and its purity testing?

Sel Fib
- Bangkok, Thailand



January 13, 2015

Q. Which indicator or chemical composition can be used to detect the presence of dithionite (S2O4-2) in an aqueous solution (ppm level)?

Adel Mirza
Zanjan University of Medical Sciences and Health Services - Zanjan, Iran


none
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