uptake and reaction of hobr on frozen and dry nacl/nabr surfaces between 253 and 233 k
امتصاص وتفاعل HOBr على أسطح NaCl/NaBr المتجمدة والجافة بين 253 و233 كلفن
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Abstract
Variation of the pH of the NaCl / NaBr solution used to prepare the frozen surfaces was found to have no significant influence on the results. The observations are explained in terms of initial formation of BrCl in a surface reaction of HOBr with Cl-, and conversion of BrCl to Br2 via reaction of surface Br -. Experiments on the uptake and reaction of BrCl with frozen NaCl / NaBr solutions served to confirm this hypothesis. The kinetics and products of the interactions of BrCl, Br2 and Cl2 with frozen salt surfaces were also investigated, and lower limits to the uptake coefficients of > 0.034, >0.025 and >0.028 respectively, were obtained. The uptake and reaction of HOBr on dry salt surfaces was also investigated and the results closely resemble those obtained for frozen surfaces. During the course of this study the gas diffusion coefficients of HOBr in He and H2O were also measured as (273 ± 1) Torr cm2 s-1 and (51 ± 1) Torr cm2 s-1, respectively, at 255 K. The implications of these results for modelling the chemistry of the Arctic boundary layer in springtime are discussed.
ووُجد أن التغير في الرقم الهيدروجيني (pH) لمحلول NaCl / NaBr المستخدم في تحضير الأسطح المتجمدة لم يكن له تأثير ملحوظ على النتائج. وتُفسَّر هذه الملاحظات بالتشكل الأولي لـ BrCl في تفاعل سطحي لـ HOBr مع Cl-، وتحول BrCl إلى Br2 عبر التفاعل مع Br- السطحي. وقد ساعدت التجارب التي أُجريت على التقاط وتفاعل BrCl مع محاليل NaCl / NaBr المتجمدة في تأكيد هذه الفرضية. كما جرى استقصاء حركيات ونواتج تفاعلات BrCl وBr2 وCl2 مع الأسطح الملحية المتجمدة، وحُصل على حدود دنيا لمعاملات الالتقاط بلغت > 0.034 و> 0.025 و> 0.028 على التوالي. ودُرس أيضاً التقاط وتفاعل HOBr على الأسطح الملحية الجافة، وجاءت النتائج مطابقة بدرجة وثيقة لتلك التي حُصل عليها للأسطح المتجمدة. وخلال هذه الدراسة، قِيست أيضاً معاملات الانتشار الغازي لـ HOBr في He وH2O حيث بلغت (273 ± 1) تور سم2 ثانية-1 و(51 ± 1) تور سم2 ثانية-1، على التوالي، عند درجة حرارة 255 كلفن. وتتم مناقشة مضامين هذه النتائج بالنسبة لنمذجة كيمياء الطبقة الحدية للقطب الشمالي في فصل الربيع.
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adams2002atmosphericuptake
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| Journal | Journal of agricultural and food chemistry |
| Year | 2002 |
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