C. The quench is performed with aqueous sodium hydrogen carbonate and ethyl acetate.

Acrylic resin is diluted in ethyl acetate and the remnant monomer is well separated from it by gas chromatography and is quantificationally measured by hydrogen flame ionization detector (FID).

Soluble lead sulfide can be extracted from the residue by 10% hydrogen peroxide, 15% ammonium acetate and 5% acetyl hydrate.