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A simple method for the determination of benzoic acid based on room temperature phosphorescence of
Jinping Wang1, Xiangfeng Guo1, Lihua Jia1
1College of Chemistry and Chemical Engineering, Key Laboratory of Fine Chemicals of College of Heilongjiang Province, Qiqihar University, Qiqihar 161006, China.
Abstract:
The addition of benzoic acid (BA) to an aqueous solution of 1-bromopyrene (1-BrPy) and γ-cyclodextrin (γ-CD) was found to form a ternary 1-BrPy/γ-CD/BA inclusion complex that exhibited strong and stable room temperature phosphorescence (RTP) without deoxygenation. The effects of several different factors on the RTP emission from the inclusion complex were subsequently investigated. A good linear relationship between the RTP intensity and the concentration of BA over the range of 0-0.70mM was identified (R2=0.9917), and the detection limit was determined to be 0.68µm. Application of the new method was successfully proved for the detection of BA in various beverages with satisfactory results.
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