Determination of selenium in freshwaters by cathodic stripping voltammetry after UV irradiation

Mattsson, Gunnar; Nyholm, Leif; Olin, Åke; Örnemark, Ulf

doi:10.1016/0039-9140(95)01494-v

Cited by 46 publications

(30 citation statements)

References 21 publications

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“…In synthetic seawater we only observe a decrease of the Se signal (curves 2 and 3, Fig. 2) as previously described [9]. In UV irradiated seawater this addition is characterized by an important decrease of the selenium signal and by the appearance of a new signal at a potential more anodic (curve 2, Fig.…”

Section: Resultssupporting

confidence: 60%

“…In a previous study [12] we proposed a speciation model based on the electrochemical properties of Se(IV) but in this study we did not investigate the behavior of selenium in seawater. According to some authors [9,13] the determination of labile dissolved concentation of selenite is not possible because of interferences resulting from the presence of dissolved organic material. Another group [14] has determined the concentrations of Se(IV), Se(VI) and selenomethionine in spiked seawater (10 mgaL of each species) but not in realistic conditions.…”

Section: Introductionmentioning

confidence: 99%

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Speciation Analysis of Selenium in Seawater by Cathodic Stripping Voltammetry

Quentel

Elléouet

1999

Electroanalysis

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A procedure for the determination of selenium species in seawater is proposed. The speciation scheme is based on different sample treatments followed by the quanti®cation of Se(IV) by differential pulse cathodic stripping voltammetry. To remove the organic matter present in seawater which interferes in the electrochemical step a XAD-2 resin is used. So the selenite concentration can be directly determined. After passage through an IRA 400, selenide is collected in the percolated solution. Following conversion into the tetravalent state, selenium is determined. UV photolysis at basic pH is used to convert all the selenium species to Se(IV) which is the electroactive species. The procedure is applied to seawater samples.

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Section: Resultssupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Speciation Analysis of Selenium in Seawater by Cathodic Stripping Voltammetry

Quentel

Elléouet

1999

Electroanalysis

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“…Organic and inorganic selenium compounds have been determined by instrumental methods including gas chromatography [3], mass spectrometry [4], and atomic absorption spectroscopy [5]. Owing to their high sensitivity, voltammetric methods have been advocated for determining selenium in environmental [6,7] and biological specimens [8,9] and in food supplements [10]. The spectroscopic methods, complementary to electrochemical, have also been used to determine selenium in environmental [11,12] and biological materials [13].…”

Section: Introductionmentioning

confidence: 99%

Voltammetric and EQCM Studies on Selenium(IV) at Mercury, Gold and Glassy Carbon Electrodes in the Presence of Cu(II), Au(III), Pb(II) and Cd(II)

1998

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Cyclic voltammetry (CV), adsorptive stripping voltammetry (AdSV) and electrochemical quartz crystal microbalance (EQCM) were employed to study the behavior of selenium(IV) at the mercury, gold and glassy carbon electrodes. Optimum measurement parameters and stock solution compositions were established. Selenium(IV) was studied in the presence of copper, gold, lead and cadmium ions. At the glassy carbon electrode, selenium and gold were found to be too slightly electroactive to be determinable. However, in view of the copious release of Se-Au in the EQCM experiment involving the gold electrode, a voltammetric procedure was developed to determine the two elements. Peak current intensities recorded in relation to a Se(IV)/Au(III) mixture concentration yielded a linear relationship over the concentration ranges 3-9 g mL ¹1 Se in the presence of 10 g mL ¹1 Au, over 3-6 g mL ¹1 Au in the presence of 10 g mL ¹1 Se, and over 4-10 g mL ¹1 Se(IV) in the presence of 16 g mL ¹1 Cu(II). Statistical analysis of the results obtained showed the procedures to be useful for determining Se(IV) and Au(III) at the glassy carbon electrode with a satisfactory accuracy and precision. In AdSV method a control growth mercury drop electrode (CGMDE) was used as the working electrode and 0.1 mol L ¹1 HClO 4 solution containg Cu(II) as supporting electrolyte. This method was applied to selective Se(IV) determination in pharmaceutical preparations (tablets) after microwave digestion. The results obtained by AdSV were compared with those obtained by AAS method. Nickel nitrate was used as a modifier in AAS method. The procedure developed enables selenium to be determined quantitatively with a satisfactory accuracy and precision in multicomponent tablets with no need for isolating it from the matrix.

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“…In this work differential pulse cathodic stripping voltammetry (DP CSV) is applied for the trace selenium determi-nation in the presence of Cu(II) ions [27,30]. The presentation of the optimized methodology of the voltammetric determination of selenium by application of cylindrical mercury film electrode formed on the silver wire, refreshed before each measurement, is the main purpose of this paper.…”

Section: Introductionmentioning

confidence: 99%

“…For selenium determination in waters other procedures should be used. Mattsson et al [27] applied UV irradiation of freshwaters in 0.1 M HCl (60 min, high pressure mercury lamp 600 W). Other authors proposed UV irradiation in alkaline solution [33,39,40] (typically at least 60 min and high power of mercury lamp).…”

Section: Introductionmentioning

confidence: 99%

Determination of Selenium Traces on Cyclic Renewable Mercury Film Silver Electrode in Presence of Copper Ions Using Cathodic Stripping Voltammetry

Piech

2008

Electroanalysis

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The new cyclic renewable mercury film silver based electrode (Hg(Ag)FE), applied for the determination of selenium(IV) traces in the presence of copper ions using differential pulse cathodic stripping voltammetry (DP CSV) is presented. The preparation of the Hg(Ag)FE is very simple. The effects of various factors such as: preconcentration potential and time, pulse height, step potential and supporting electrolyte composition are optimized. The calibration graph is linear from 0.5 nM (39 ng L À1) to 100 nM (7.9 mg L À1) for a preconcentration time of 45 s, with correlation coefficient of 0.9995. For a Hg(Ag)FE with a surface area of 8 mm 2 the detection limit for a preconcentration time of 90 s is as low as 17 ng L À1 . The repeatability of the method at a concentration level of the analyte as low as 2 mg L À1 , expressed as RSD is 2.7% (n ¼ 7). The proposed method was successfully applied and validated by studying the certified reference material (bovine liver BCR-185) and simultaneously recovery of Se(IV) from spiked water samples.

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Determination of selenium in freshwaters by cathodic stripping voltammetry after UV irradiation

Cited by 46 publications

References 21 publications

Speciation Analysis of Selenium in Seawater by Cathodic Stripping Voltammetry

Speciation Analysis of Selenium in Seawater by Cathodic Stripping Voltammetry

Voltammetric and EQCM Studies on Selenium(IV) at Mercury, Gold and Glassy Carbon Electrodes in the Presence of Cu(II), Au(III), Pb(II) and Cd(II)

Determination of Selenium Traces on Cyclic Renewable Mercury Film Silver Electrode in Presence of Copper Ions Using Cathodic Stripping Voltammetry

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