A comparison of solid sampler methods for the determination of hexamethylene-based isocyanates in spray-painting operations

A polyurethane foam sponge impregnated with 1-(2-methoxyphenyl) piperazine in dimethylsulfoxide was mounted in both cassette and inhalable organic mon itor samplers and these were then compared with a dual-filter cassette. The samplers were used for the collection of hexamethylene diisocyanate (HDI) monomer and oligomers during actual spray-painting operations. The dual fil ter cassettes were positioned on a mannequin. The polyurethane foam cassett e (PUF CAS) and polyurethane foam inhalable organic monitor (PUF IOM) sampl ers were positioned on a cart in the same maximum overspray area. Data from this pilot study suggest that there is no significant difference (P < 0.05 , n = 6) in the amount of HDI monomer obtained with the PUF IOM sampler whe n compared with the amount of HDI monomer obtained with the PUF IOM sampler when compared with the amount obtained from the dual filter cassette. The data also suggest that the PUF IOM sampler yields a higher amount of HDI ol igomer than either the dual filter cassette or the PUF CAS sampler, neither of which exhibited a significant difference (P < 0.05, n = 6) from each ot her.