Abstract

Rate coefficients for the reaction of the nitrate radical with dimethyl mercury (DMHg) have been determined. The absolute rate was measured at temperatures from 258 to 358 K in the pressure range between 2.7 and 5.0 hPa using the fast-flow-discharge technique. The Arrhenius expression is 3.2 × 10 −11 exp[−(1760 ± 400)/ T] cm 3 molecule −1 s −1, corresponding to a rate coefficient of 8.7 × 10 −14 cm 3 molecule −1 s −1 at 298 K and an activation energy of 14.6 ± 3.3 kJ mol −1. The atmospheric lifetime of DMHg with respect to NO 3 radicals is 4 h at a radical concentration of 1 × 10 9 molecules cm −3. Elemental mercury was identified as a minor reaction product.

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