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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Hazards of Sodium hydrosulphite (dithionite)
Q. I am querying the hazard classifications for sodium hydrosulfite ⇦this on eBay or Amazon zincaffil links] . 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 sulfurous fumes.
Geoffrey Whitelaw
- Port Melbourne, Australia
2003
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.
- Kerala, India
2007
Quantitative Estimation of Sodium Hydrosulphite
Q. Can anybody please give me some information on quantitative estimation of Sodium Hydrosulphite and its purity testing?
Sel Fib- Bangkok, Thailand
January 18, 2008
Q. Which indicator or chemical composition can be used to detect the presence of dithionite (S2O4-2) in an aqueous solution (ppm level)?
Adel MirzaZanjan University of Medical Sciences and Health Services - Zanjan, Iran
January 13, 2015
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