US EPA

1347643 

Journal Article 

Determination of trace arsenic by solid substrate-room temperature phosphorescence quenching method based on the catalyzed reaction of H2O2 oxidizing 9-hydroxy-2,3,4,9-tetrahydro-1, 10-anthraquinone 

Hu Shi-Rong; Wen Quan; Kong Xiang-Bin; Luo Cai-Ying; Chen Hui-Hua; Chen Li-Fen; Zhang Yu-Ping 

2007 

Yes 

Chinese Journal of Chemistry
ISSN: 1001-604X 

25 

4 

527-530 

WOS:000245778200016 

A new solid substrate-room temperature phosphorescence (SS-RTP) quenching method for the determination of trace As(V) has been developed, based on the facts that 9-hydroxy-2,3,4,9-tetrahydro-1,10-anthraquinone (R) can emit intense and stable SS-RTP on solid substrate, and alpha,alpha'-dipyridyl can activate As(V) catalysis of the reaction of H2O2 oxidizing R to non-phosphorescence compound R', which can cause the sharp quenching of SS-RTP. Under the optimum condition, the relationship between the Delta Ip of the emitting intensity and 1.60-160 fg(.)spot(-1) As(V) (corresponding concentration: 0.0040--0.40 ng-mL-', sample volume: 0.4 mu L-spot(-1)) conformed to Beer' law. The regression equation of working curve can be expressed as Delta Ip= 20.46+0.5492CA,(V) (fg(.)-spot(-1)) (r=0.9995, n=6). The limit detection (LD) is 0.27 fg(.)spot-1 [As(V) corresponding concentration: 6.8X 10-13 g(.)mL(-1), n = 11]. The samples containing 0.0040 and 0.40 ng(.)mL(-1) As(V) were repeatedly determined for 11 times. RSD are 3.0% and 2.7% respectively. The SS-RTP mechanism was also discussed. R was synthesized in this paper. Meanwhile, the structure was determined by NMR, IR, mass spectra and elemental analysis. 

arsenic; phosphorescence; a,a'-dipyridyl; anthraquinone