Neutralizing TCA washes Trichloroacetic Acid (TCA) is commonly used for protein precipitation but the wash waste needs to be neutralized prior to disposal. What exactly is required to effectively neutralize TCA waste? Do I just add caustic?

I've been fortunate to find a protocol hidden away in my lab archives.

* The acid waste can be accumulated for 10 days before it needs to be neutralized. The waste should be kept in a carboy in a **fume hood**.
* 50 mL 50% w/v Sodium Bicarbonate slurry should be added per liter of TCA waste. During neutralization fumes will be generated which may include **chlorine gas**.
* When the pH reaches 6-8, dispose the waste into the sewer.