[Objective] To assess the relationship between workplace concentration and biological monitoring level of dimethylacetamide(DMAC),and to establish its occupational biological exposure limits.[Methods] Urine samples of 32 workers exposed to DMAC from a 4,4'-diaminodiphenyl ether plant before and after work shifts on day 1,2,and 5 were collected to detect urinary N-methylacetamide(NMAC) by gas chromatography.Air samples were collected with individual samplers during work shifts to detect DMAC concentration.Mu...