Application of Anthraquinone Derivative for Determination of Trace Hg2+ by Solid Substrate-Room Temperature Phosphorescence Quenching Method

KeyWord:anthraquinone  phosphorescence quenching method  mercury  determination

Abstract:

      2,3-Dihydro-9,10-dihydroxy-1,4-anthraquinone£¨R£©was synthesized and characterized by 1H NMR£¬IR£¬MS and UV-Vis spectrometry.Based on the facts that R can emit intense and stable solid substrate-room temperature phosphorescence(SS-RTP) on solid substrate£¬and ¦Á£¬¦Á¬ð dipyridine can activate Hg2+ to catalyze the reaction of H2O2 oxidizing R to form non phosphorescence compound, a new solid substrat-room temperature phosphorescence quenching method was established for the determination of trace mercury.Under the optimum condition£¬the relationship between the ¦¤Ip of the emitting intensity and 1.60-160 fg/spot Hg2+£¨corresponding concentration:0.004 0-0.40 ¦Ìg/L£¬sample volume:0.4 ¦ÌL/spot£© conformed to Beer¬ð law.The regression equation was ¦¤Ip=11.56£«0.549 2 m£¨fg/spot£© £¨r=0.999 1£©.The limit detection was 0.26 fg/spot£¨corresponding Hg2+ concentration:6.5¡Á 10-10 g/L£©.The spiked recoveries were in the range of 97%-103% with RSDs of 2.3%-4.1%.The RSDs£¨n=11£© of 0.004 0 ¦Ìg/L and 0.40 ¦Ìg/L Hg2+ were 2.6% and 4.1%£¬respectively.The method showed good repeatability£¬sensitivity and high precision.It was applied in the determination of trace mercury £¨¢ò£© in real samples with satisfactory results.