Determination of Platinum and Rhodium by Stripping Voltammetry

The polarographic behavior of 3-nitrofluoranthene was investigated by DC tast polarography (DCTP) and differential pulse polarography (DPP), both at a dropping mercury electrode, differential pulse voltammetry (DPV) and adsorptive stripping voltammetry (AdSV), both at a hanging mercury drop electrode. Optimum conditions have been found for its determination by the given methods in the concentration ranges of 1 × 10-6-1 × 10-4 mol l-1 (DCTP), 1 × 10-7-1 × 10-4 mol l-1 (DPP), 1 × 10-8-1 × 10-6 mol l-1 (DPV) and 1 × 10-9-1 × 10-7 mol l-1 (AdSV), respectively. Practical applicability of these techniques was demonstrated on the determination of 3-nitrofluoranthene in drinking and river water after its preliminary separation and preconcentration using liquid-liquid and solid phase extraction with the limits of determination 4 × 10-10 mol l-1 (drinking water) and 2 × 10-9 mol l-1 (river water).

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Determination of trace amounts of lead by adsorptive cathodic stripping voltammetry with L-3-(3,4-Dihydroxyphenyl)alanine

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc2008175 ◽

2009 ◽

Vol 74 (4) ◽

pp. 599-610 ◽

Cited By ~ 1

Author(s):

Mohammad Bagher Gholivand ◽

Alireza Pourhossein ◽

Mohsen Shahlaei

Keyword(s):

Lead Concentration ◽

Stripping Voltammetry ◽

Optimum Conditions ◽

Lead In Blood ◽

Accumulation Time ◽

Cathodic Stripping Voltammetry ◽

Voltammetric Measurement ◽

Adsorbed Complex ◽

Reduction Current

A sensitive and selective procedure is presented for the voltammetric determination of lead. The procedure involves an adsorptive accumulation of lead L-3-(3,4-dihydroxyphenyl)alanine (LDOPA) on a hanging mercury drop electrode, followed by a stripping voltammetric measurement of reduction current of an adsorbed complex at –0.15 V (vs Ag|AgCl). Optimum conditions for lead analysis include pH 8.5, 80 μM LDOPA and accumulation potential –0.15 V (vs Ag|AgCl). The peak currents are proportional to the lead concentration 1–300 nmol l–1 with a detection limit of 0.6 nmol l–1 and accumulation time 60 s. The method was used for the determination of lead in blood, dry tea and also in waters.

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Electroanalytical Techniques for the Detection of Selenium as a Biologically and Environmentally Significant Analyte—A Short Review

Molecules ◽

10.3390/molecules26061768 ◽

2021 ◽

Vol 26 (6) ◽

pp. 1768

Author(s):

Miroslav Rievaj ◽

Eva Culková ◽

Damiána Šandorová ◽

Zuzana Lukáčová-Chomisteková ◽

Renata Bellová ◽

...

Keyword(s):

Oxidative Stress ◽

Essential Element ◽

Analytical Techniques ◽

High Sensitivity ◽

Stripping Voltammetry ◽

Short Review ◽

Electroanalytical Methods ◽

High Concentrations ◽

Speed Of Analysis

This short review deals with the properties and significance of the determination of selenium, which is in trace amounts an essential element for animals and humans, but toxic at high concentrations. It may cause oxidative stress in cells, which leads to the chronic disease called selenosis. Several analytical techniques have been developed for its detection, but electroanalytical methods are advantageous due to simple sample preparation, speed of analysis and high sensitivity of measurements, especially in the case of stripping voltammetry very low detection limits even in picomoles per liter can be reached. A variety of working electrodes based on mercury, carbon, silver, platinum and gold materials were applied to the analysis of selenium in various samples. Only selenium in oxidation state + IV is electroactive therefore the most of voltammetric determinations are devoted to it. However, it is possible to detect also other forms of selenium by indirect electrochemistry approach.

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