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The following measured data were reported and used in the fugacity-based distribution modeling. TNPP undergoes hydrolysis with half-lives of 13 to 14 hours at pH values of 4 to 9 (at 22 °C) (Reimer, 2001a), has a melting point averaging 6 °C (Reimer, 2001b), and a water solubility of < 0.6 mg/L (24 °C) (Reimer, 2001c). In addition, an expert statement with a calculated log Kow value of 21.6 was provided (Reimer, 2001d). This expert statement was reviewed and is correct. Using the EPIWIN models described above, additional parameters were estimated. They include a water solubility of 1.3 E-15 mg/L, a vapor pressure of 5 E-12 Pa, an atmospheric half-life of 5.07 hours, water and soil biodegradation half-lives of 900 hours, and a sediment half-life of 3600 hours. Excepting the water and soil biodegradation half-lives, these values were all used in the distribution modeling. Hydrolysis is the dominant fate process in water and would be equally so in soil, so a 14 hour half-life was used in those compartments. The results of the distribution modeling (assuming equal emissions to air, water, and soil) were: Air 1.4 %, Water 4.5%, Soil 5.6%, and Sediment 88.6%.
The vast majority of TNPP released into the environment partitions to the sediment.
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