TOXIC VOLATILE COMPONENTS OF ORGANIC SOIL CONSOLIDATING AGENTS

Abstract

The toxic volatile components in acrylamide and urea formaldehyde resins which were industrially manufactured as soil consolidating agents were analyzed by gas chromatography and gas chromatography-mass spectrometry before and after poly-merization. In acrylamide monomer solution, acrylonitrile was contained up to 0.3mg/ml as an impurity and after gelation of the solution by polymerization with sand, it evaporated to air up to 4440mg/m³ at equilibrium. In the solution of urea formaldehyde condensate prior to the gelation, formaldehyde up to 192mg/ml, formic acid up to 20.6mg/ml, trace amount of associated formaldehyde and another higher molecular compound were contained and after gelation of the resin with sand by further condensation, trace ammonia, formaldehyde up to 14900mg/m³, formic acid up to 96mg/m³ and associated formaldehyde up to 1800mg/m3 evaporated from the gel to air at equilibrium. DTA and TG curves were observed on the gels which revealed the dehydration of the gels at 80-180°C and the thermal decomposition at 500-600°C.