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Rate of reaction between the nitrate radical and dimethyl mercury in the gas phase

✍ Scribed by Jonas Sommar; Mattias Hallquist; Evert Ljungström

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
365 KB
Volume
257
Category
Article
ISSN
0009-2614

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✦ Synopsis

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 b.Pa using the fast-flow-discharge technique. The Arrhenius expression is 3.2 X 10 -tl exp[-(1760+ 400)/T] cm a molecule -ms -m, corresponding to a rate coefficient of 8.7 X 10 -t+ cm 3 molecule -m s -I at 298 K and an activation energy of 14.6 -1-3.3 kJ tool-~. The atmospheric lifetime of DMHg with respect to NO 3 radicals is 4 h at a radical concentration of 1 × 109 molecules cm-3. Elemental mercury was identified as a minor reaction product.

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