Categorized | Electronic, Environmental

Neutralizing Citranox for Waste Disposal

Q. We manufacture electronics and use Citranox to clean oil off of a variety of machined parts. However, our Municipal Water District does not allow the disposal of spent Citranox. Can you recommend a neutralizing procedure?

A. You will need 0.14 lbs, 0r 2 ¼ oz of baking soda (sodium bicarbonate) to neutralize a gallon of un-used 1% Citranox® Liquid Acid Cleaner and Detergent solution to a pH near 7. Note that some of the acidity in Citranox may be depleted by your cleaning process, so this neutralization recipe results in a conservative recommendation that may use slightly more baking soda than might be needed, but which gives you a higher confidence that you will in fact be above pH 6. A little overdosing of baking soda might cause the pH of the solution to rise as high as 8.5, but is not likely to rise much beyond that.

Add the baking soda by sprinkling it over the solution being neutralized so as to expose individual particles of baking soda rather than a big clump. Bubbling to release a small amount of carbon dioxide is normal. The amounts of carbon dioxide released are small and can be handled in a normal open inside environment. When the bubbling has stopped, the pH is likely to be above pH 7.

Note that a 2% solution will need twice as much material for neutralization.

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