This study was designed to identify and quantitate airborne isocyanate simultaneously by HPLC. These samples were collected using 1-(2-pyridyl)piperazine(1-2PP) coated glass fiber filter from polyurethane painting works at 8 wood furniture factories in Kimpo and Inchun.
The results obtained were as follows :
1. The most suitable mobile phase condition of simultaneously analyzing isocyanates was 0.01 M ammonium acetate buffer ACN(70/30) adjusted to pH 6.2 from the beginning of the analysis to 20 min and 0.01 M ammonium acetate buffer/ACN(50/50) adjusted to pH 6.2 from 21 min to 40 ruin using tire gradient mode. The peaks of isocyanates were able to obtain within 30 min.
2. The recovery efficiencies for 2,6=TDI, 2,4-TDI, HDI and MDI urea derivates spiked at the target concentration on cooled glass fiber filter were 91.00, 93.42, 91.31 and 94.21 %, respectively.
3. The qualitative analysis of the isocyanates samples from polyurethane spray painting works in wood furnture factories identified three isocyanates, 2,6-TDI, 2,4-TDI and MDI. And their concentration ranges were 0-312.6, 0-56.3 and 0-62.1㎍/㎥, respectively.
A disadvantage of using the colorimetric method for isocyanate analysis is its inability of separating isocyanates. This study identified such three isocyanates as 2,6-TDI, 2,4-TDI and MDI from polyurethane spray painting works in wood furniture factories. These isocyanates were. successfully quantitated by HPLC by modifying the mobile phase condition and switching to gradient mode.
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