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Effect of temperature on the evolution of n-butyl isocyanate from aqueous Benlate® formulations

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Rates of n-butyl isocyanate (BIC) evolution from Benlate® DF and WP formulations were determined at temperatures from 25 to 40°C. The aqueous Benlate® mixture was added to a glass bottle containing basaltic gravel, and the gas phase BIC carried to an XAD-2 cartridge by a stream of air. The trapped BIC was eluted and analyzed by gas chromatography. For older samples obtained from a grower, the average rate of BIC evolution in the first 6 h in DF increased by more than 10-fold to 25 μg/h (3.6 ppm in the head space) when the temperature was increased from 25 to 40°C. In the WP sample, the increase was 3.8-fold to 3.5 μg/h (0.5 ppm). These results demonstrate that aqueous Benlate® formulations produced higher levels of BIC under elevated temperatures, especially when Benlate® DF was used.

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Correspondence to C. S. Tang.

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Tang, C.S., Zhang, Y., Yee, A.B.K. et al. Effect of temperature on the evolution of n-butyl isocyanate from aqueous Benlate® formulations. Arch. Environ. Contam. Toxicol. 25, 516–519 (1993).

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  • Chromatography
  • Waste Water
  • Water Management
  • Elevated Temperature
  • Water Pollution