[Determination of trace manganese in Mongolian medicine by methylthymol blue-Mn(II)-H2O2 catalytic system].
A new catalytic kinetic spectrophotometry method for the determination of trace manganese based on the oxidation reaction of H2O2 with methylthymol blue in Na2B4O7-NaOH medium has been developed. The range of the determination range was 0.20-40.00 microg x L(-1). The apparent activation energy and apparent rate constant were 73.24 kJ x mol(-1) and 5.62 x 10(-4) x s(-1), respectively, and the detection limit was 6.4 x 10(-10) g x mL(-1). The method has been used to determine trace manganese in Mongolian medicine with satisfactory result.
Wu
Yun
Y
Department of Chemistry, Inner Mongolia Normal University, Huhhot 010022, China.
Li
Jing-feng
JF
Garidi
D001979:Bromthymol Blue / Q000031:analogs & derivatives* / Q000737:chemistry; D002384:Catalysis; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D008345:Manganese / Q000032:analysis*; D056785:Medicine, Mongolian Traditional; D013053:Spectrophotometry / Q000379:methods*; D013501:Surface-Active Agents / Q000494:pharmacology
D013501:Surface-Active Agents; C002074:methylthymol blue; D008345:Manganese; D001979:Bromthymol Blue