کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
869438 909830 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Stopped-flow system with ozonizer for the estimation of low biochemical oxygen demand in environmental samples
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Stopped-flow system with ozonizer for the estimation of low biochemical oxygen demand in environmental samples
چکیده انگلیسی

The stopped-flow system with an ozonizer was developed to estimate low biochemical oxygen demand (BOD) in rivers. Rivers contain many biopersistent organic compounds such as humic acid, lignin, and gum arabic. Free radicals generated by self-decomposition of ozone were used as powerful oxidants to split organic compounds. Ozonysis of the samples was carried out by 42.4 g N−1 m−3 ozone for 3 min at pH 7.0. Artificial wastewater (AWW) solutions were employed as standard solutions for the calibrations of the BOD sensor. At a BOD of 1 mg l−1, the sensor response after ozonation was 1.6-fold higher than that before ozonation. The response time of the BOD sensor was only 5 min, being independent of the concentrations, and the lower detection limit was 0.5 mg l−1 BOD. The degradations of lignin and tannic acid by ozonation were 54.1 and 42.3%, respectively. In the biosensor responses by ozonation, lignin, gum arabic, and surfactant increased by double or more compared with previous responses. BOD in rivers was estimated using the stopped-flow system. Environmental samples pretreated with ozone gave high responses to the biosensor that were similar to those of the conventional BOD5 method. Accordingly, a good correlation between the sensor and the conventional BOD5 was obtained (r = 0.989). The system has to evolve the highly sensitive BOD determination.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biosensors and Bioelectronics - Volume 22, Issue 12, 15 June 2007, Pages 3092–3098
نویسندگان
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