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Environmental fate & pathways

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Tertiary butyl acetate is expected to hydolyse slowly in water, with half-life at environmentally relevant conditions expected to be between 6 -12 months. Based on the chemical structure of tertiary butyl acetate, it is considered to hydrolyse at the ester functional group to give tertiary butyl alcohol and acetic acid. Estimated half-life for atmospheric degradation was 19.7 days.The reaction rate constant for OH radical degradation was determined to be 0.56 +/- 0.05 E-12 cm3/molecule/second.

When tertiary butyl acetate is reacted with OH radicals in the presence of NO, the products acetone and acetic anhydride are formed at molar formation yields of 0.49 +/- 0.05 and 0.20 +/- 0.02 respectively.

The POCP of tertiary butyl acetate has been calculated as 6.5. Ethane has a POCP of 12.3 and it has been long established to be unreactive and not thought to significantly contribute to regional scale ozone formation. Tertiary butyl acetate has a POCP lower than that of ethane and so could be considered to provide a negligible contribution to regional scale ozone formation.

Using the MIR, MOIR and EBIR scales, tertiary butyl acetate yields reactivity values (gm O3/gm VOC) of 0.180, 0.102 and 0.062 respectively.