sceptic
Harmless
Posts: 49
Registered: 7-6-2022
Location: Southern Africa
Member Is Offline
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Destroying Chlorpyriphos
I have about 5 litres of an old 20% solution of chlorpyriphos which I want to get rid of. Given how poisonous it is, I think I'll need to destroy it
chemically before I can dispose of it. There is no hazardous waste centre near here that I know of, and even if I tried to find one farther away, I
doubt that they would take anything from a private citizen. I'm thinking of using some Fenton's reagent, although that much hydrogen peroxide would be
a bit expensive. I also considered electrochemical oxidation, but I don't want to have the cathode bubbling and releasing a mist of chlorpyriphos
solution. I could make a contained electrolysis cell, but that would probably be more trouble than buying the hydrogen peroxide. Does anyone else have
any ideas?
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Sulaiman
International Hazard
Posts: 3692
Registered: 8-2-2015
Location: 3rd rock from the sun
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Ideas but no knowledge!
Decomposes (to what?) at its bp of 160oC
Flammable
Incompatible with strong acids and caustics.
https://www.cdc.gov/niosh/npg/npgd0137.html
https://en.wikipedia.org/wiki/Chlorpyrifos
CAUTION : Hobby Chemist, not Professional or even Amateur
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unionised
International Hazard
Posts: 5126
Registered: 1-11-2003
Location: UK
Member Is Online
Mood: No Mood
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How quickly is it hydrolysed in alkaline conditions?
I have seen reports of a half life of 16 days in alkaline solution (pH 9).
But the real question is "How will you know you have destroyed it?".
If you can't answer that, you aren't in a position to do anything.
[Edited on 4-1-24 by unionised]
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Rainwater
National Hazard
Posts: 919
Registered: 22-12-2021
Member Is Offline
Mood: indisposition to activity
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Its got carbon. Fire
Big propane burner, very small bowl. Steady drip rate.
https://www.atsdr.cdc.gov/ToxProfiles/tp84-c4.pdf
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4.4 DISPOSAL
The recommended treatment and disposal methods for chlorpyrifos are incineration, adsorption, and landfilling
(IRPTC 1989). For small amounts, the recommended disposal is adsorption onto materials such as sand and burying
in locations away from domestic water supplies. For the decontamination of containers, the triple rinse and drain
procedure is recommended. The use of a caustic soda-methanol or caustic soda-detergent rinse solution is also
effective in decontaminating the container, but the rinse solutions must be disposed of either by incineration or burial
in an area away from water supplies (IRPTC 1989).
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"You can't do that" - challenge accepted
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