Sono-cathodic stripping voltammetry of manganese at a polished boron-doped diamond electrode: application to the determination of manganese in instant tea.
Ultrasonically assisted cathodic stripping voltammetry at a boron-doped diamond electrode was developed for the detection of manganese. Differential-pulse voltammetry was used to give the analytical signal from a cathodic strip of electrodeposited MnO2; linearity was observed from 10(-11) M to at least 3 x 10(-7) M, with 10(-11) M being the detection limit for a 2 min deposition. The procedure involves both ultrasonic-anodic deposition of MnO2 and ultrasonic-cathodic stripping. This novel analytical tool is robust, reproducible, mercury free, oxygen insensitive and highly specific towards manganese. The differential-pulse sono-cathodic stripping voltammetric technique was used to determine successfully the manganese content of two instant tea samples, giving excellent agreement with independent AAS analyses.
Saterlay
A J
AJ
Physical and Theoretical Chemistry Laboratory, Oxford University, UK.
Foord
J S
JS
Compton
R G
RG
D001895:Boron; D018130:Diamond; D004563:Electrochemistry; D004566:Electrodes; D008345:Manganese / Q000032:analysis*; D012680:Sensitivity and Specificity; D013662:Tea / Q000737:chemistry*
D013662:Tea; D008345:Manganese; D018130:Diamond; D001895:Boron