A Coated Piezoelectric Crystal Sensor for the Determination of 2, 4-Toluene Diisocyanate in Air |
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Abstract: | Abstract 2, 4-toluene diisocyanate (TDI) in air was detected and determined by a piezoelectric quartz crystal sensor coated with tetrakis(hydroxyethyl)ethylenediamine (THEED)/dithizone(diphenylthiocarbazone) solution (l:3v/v in acetone). The response curve is linear over the concentration range 3–24 ppb of TDI. The sensor can be used for more than 2 months without loss in sensitivity and presented good reversibility and reproducibility. Of the different possible interferents tested, only SO2 caused a frequency change. |
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Keywords: | piezoelectric crystal sensor 2 4-toluene diisocyanate THEED/ dithizone coating |
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