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《Chemical Reagents》 2003-01
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Synthesis of 2,3-dihydroxyl quinoxaline and its applica- tion in the determination of trace lead

Yang Changxin , Xiao Xiangxu, Yangzhibin ( Jiangzhong Pharmaceutical Co. , Ltd. Jiangxi, Nancheng 330077 ; Department of Chemistry Nanchang University, Nanchang 330047), Huaxue Shiji,2003,25(1),20-22  
A new fluorescent reagent 2, 3-dihydroxyl quinoxaline (DHQX) has been synthesized and characterized by IR and elemetal analysis. It is used for the determination of trace Pb(Ⅰ) in vinegar. DHQX shows an intense fluorescence at λ/λem= 328/414nm. The reaction of Pb (Ⅱ) with DHQX takes place in the pH range of 2. 7-3. 4 with maximal fluorescence quenching. The linear range of detection was found to be 0 ~ 75μg/25mL with satisfactory results.
【CateGory Index】: TQ421
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