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Indirect determination of lutetium by differential pulse anodic stripping voltammetry at a hanging mercury drop electrode

100%
Kumrić K., Trtić-Petrović T., Ignjatović L., Čomor J.
Open Chemistry
|
2008
|
vol. 6
|
issue 1
65-69
EN
Lutetium has been determined by differential pulse anodic stripping voltammetry in an acidic solution containing Zn-EDTA. Lutetium (III) ions liberated zinc (II), which was preconcentrated on a hanging mercury drop electrode and stripped anodically, resulting in peak current linearly dependent on lutetium (III) concentration. Less than 0.4 ng mL−1 lutetium could be detected after a 2 min deposition. [...]
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Proposal for a mercury isolation procedure using cold vapor method in combination with voltammetric determination using a rotating gold electrode

88%
Chýlková J., Šelešovská-Fadrná R., Machalíková J.
Open Chemistry
|
2007
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vol. 5
|
issue 2
479-495
EN
The optimal process of pre-treatment and activation of gold rotating disc electrode (AuRDE) before voltammetric determination of mercury is proposed. This treatment encompasses polishing of the electrode surface, electrochemical cycling, and activation. This procedure both increases determination sensitivity as well as improves determination reproducibility. The detection limit on the working electrode achieved using this approach amounted to 8.26·10−10 mol L−1for direct mercury determination in water solution (applying 200 s running accumulation). The procedure of the quantitative mercury isolation from complicated sample matrix was developed as well. It provides better selectivity and significant increase of sensitivity of mercury determination. In case of mercury isolation from one liter of water the detection limit is 6.23·10−11 mol L−1 (analyzing a greater sample volume the determined concentration could be lower). [...]
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