Chemiluminescence determination of sulphite using a cyclometalated iridium complex as chemiluminescence reagent.
A simple, fast and accurate chemiluminescence (CL) method for the determination of sulphite has been developed, based on its sensitizing effect on the CL reaction between a novel water-soluble iridium complex, [(dpci)2Ir(bvbbi)](PF6) (dpci =  3,4-diphenylcinnoline; bvbbi =  N,N'-bivinylester-(1)H,(1')H-[2,2'] bibenzimidazole) and cerium(IV). Under the optimal experimental conditions, the increased CL response was linear, with the concentration of sulphite over the range 5.0 × 10(-7)-5.0 × 10(-4)  mol/L. The detection limit of the method was 1.6 × 10(-7)  mol/L, with a relative standard deviation (RSD) of 2.7% for nine repetitive determination of 1.0 × 10(-4)  mol/L sulphite. The method was successfully applied to the quantitative analysis of sulphite in sugar samples. The possible reaction mechanism of sulphite on the [(dpci)2Ir(bvbbi)](PF6)-cerium(IV) system is also briefly discussed.
School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan, People's Republic of China. ahutsjz@126.com
Fanghui
F
Wu
Bihai
B
Tong
Xianwen
X
Wei
Le
L
Chen
D002563:Cerium / Q000737:chemistry; D019422:Dietary Sucrose / Q000032:analysis; D005504:Food Analysis / Q000379:methods; D007495:Iridium / Q000737:chemistry*; D007700:Kinetics; D057230:Limit of Detection; D008163:Luminescent Measurements / Q000379:methods*; D015394:Molecular Structure; D013447:Sulfites / Q000032:analysis*
D019422:Dietary Sucrose; D013447:Sulfites; D002563:Cerium; D007495:Iridium