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RESEARCH PRODUCT
Digestion-free determination of heavy metals (Pb, Cd, Cu) in honey using anodic stripping differential pulse voltammetry and potentiometric stripping analysis
Faramarz WahdatYingjian LiRolf Neebsubject
Anodic stripping voltammetryAdsorptionStripping (chemistry)ChemistryHanging mercury drop electrodePotentiometric titrationOxidizing agentAnalytical chemistryfood and beveragesDifferential pulse voltammetryDropping mercury electrodeBiochemistryAnalytical Chemistrydescription
Experiments have been carried out to assess the potential of differential pulse voltammetry and potential stripping analysis for determining Pb, Cu and Cd directly in dissolved honey samples using a flow-through cell. With the hanging mercury drop electrode Pb alone can be determined only if the electrode is first modified in-situ with Triton X 100 to increase the separation between the Pb peak and a broad, interfering adsorption peak which overlaps the Cu peak. If the (more sensitive) thin film mercury electrode is used the interference encountered is less so also Cu and Cd can be determined. With potentiometric stripping analysis Cu and Pb can be determined using normal procedures. The determination of Cd, however, can only be carried out if the concentration of the oxidizing agent [Hg(II)] in solution is decreased. A good agreement has been obtained between the values found and those obtained after high pressure digestion of the samples.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1995-01-01 | Fresenius' Journal of Analytical Chemistry |