کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4444831 1311257 2006 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Gas phase reaction of selected isothiocyanates with OH radicals using a smog chamber-mass analyzer system
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
پیش نمایش صفحه اول مقاله
Gas phase reaction of selected isothiocyanates with OH radicals using a smog chamber-mass analyzer system
چکیده انگلیسی

Relative rate constants for the gas phase reaction of methyl isothiocyanate (1), ethyl isothiocyanate (2), allyl isothiocyanate (3), phenyl isothiocyanate (4), 2-methylphenyl isothiocyanate (5), benzoyl isothiocyanate (6), and 4-methoxyphenyl isothiocyanate (7) with OH radicals have been determined at 297±2 K and 9.21×10−2 Atm in a 20 L smog chamber-coupled online with a quadrupole mass analyzer, in which the concentration of the reaction partners could be determined online every minute. Some of the photoproducts could be detected and identified by HRGC-MS and HRGC-FTIR spectroscopy. The rate constants of the isothiocyanates obtained for the OH radical reactions ranged between 12.8 and 99.5×10−12 cm3 molecule−1 s−1. The indicated errors were of 2-least-squares standard deviations. The lifetimes of the investigated compounds in the troposphere due to reactions with the OH-radicals were calculated and ranged from 3.5 to 18.8 h by using the tropospheric concentration of OH radicals of 8.0×105 molecules cm−3 over a period of 24 h.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 40, Issue 18, June 2006, Pages 3306–3315
نویسندگان
, , ,