کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10561427 | 969774 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A chemiluminescence-based continuous flow aqueous ozone analyzer using photoactivated chromotropic acid
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Ozone has become the oxidant of choice for water disinfection, especially in large water treatment facilities. This paper describes a fast and sensitive method for the determination of ozone content by reaction with photoactivated chromotropic acid (CA, 4,5-dihydroxynaphthalene-2,7-disulfonic acid), which results in intense chemiluminescence (CL). Freshly ozonated water from a recirculating ozonizer/reservoir is injected into a carrier stream of deionized water in the flow-injection mode. This flow mixes with a stream of photoactivated CA solution in a spiral cell placed directly on top of an inexpensive miniature (8 mm diameter active area) photomultiplier tube (PMT). Alkaline CA is photoactivated by passing it through a FEP-Teflon® coil (residence time â¼Â 50 s) wrapped around a 1 W UV lamp emitting at 254 nm; without photoactivation, the signal is â¼70-fold lower. The S/N = 3 limit of detection for aqueous ozone is 3 μg lâ1 and good response slope is obtained up to an ozone concentration of 1.4 mg lâ1, the highest that could be made in this study. The response obeyed a quadratic equation with r2 = 0.9984. No interference from permanganate ion is observed. The proposed system was applied to the monitoring of ozonation status of a playa lake water that exhibited significant ozone demand.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Talanta - Volume 66, Issue 4, 15 May 2005, Pages 823-830
Journal: Talanta - Volume 66, Issue 4, 15 May 2005, Pages 823-830
نویسندگان
Toshio Takayanagi, Purnendu K. Dasgupta,