Simultaneous ultratrace determination of platinum and rhodium by cathodic stripping voltammetry

León, Carlos Ponce de; Emons, Hendrik; Ostapczuk, P.; Hoppstock, K.

doi:10.1016/s0003-2670(97)00520-5

Cited by 75 publications

(61 citation statements)

References 13 publications

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“…Equation 1 differs from that sug- The results are reported in Table 4. The obtained limit of detection appears noticeably higher than those previously reported, that is 21 pg/L [17] and 0.1 ng/L [34]. Likely, this is due to the effects of the heavy digestion treatments used in this work to analyze real matrices.…”

Section: Limits Of Detection and Of Quantificationmentioning

confidence: 54%

“…Noticeably, because of the outstanding sensitivity of the CAdSV method [17,34] the uncertainty of the results of Table 3 (RSD % 20 ± 30%) looks much lower than that calculated by the Horwitz equation [37] (i.e., RSD 90 ± 130% at the same concentration levels). As a matter of fact, as it was recently underlined by Thompson [38,39], the Horwitz equation, developed about twenty years ago is going to be adjusted as a consequence of the progress in chemical instrumentation and methodologies.…”

Section: Selectivitymentioning

confidence: 93%

“…According to the Metrohm Application Bulletin [34], based on the Hoppstock method [17], the supporting electrolyte for CAdSV measurements was 0.72 mol/L in sulfuric acid, 6.7 Â 10 À3 mol/L in formaldehyde and 3.0 Â 10 À3 mol/L in hydrazine sulfate. The blank was obtained by adding the supporting electrolyte to digested aqueous solutions of the reactants (hydrogen peroxide and hydrochloric acid).…”

Section: Electrolyte Compositionmentioning

confidence: 99%

“…One of the most sensitive methods for determining PGE, based on catalytic adsorptive stripping voltammetry (CAdSV) at a hanging mercury drop electrode (HMDE) in aqueous media, allows determining the overall concentration of platinum and rhodium at sub-mg/L level [17]. This excellent sensitivity results from the adsorption, onto the mercury drop surface of the Pt-formazone complex produced by reaction of platinum with formaldehyde and hydrazine in the presence of sulfuric acid.…”

Section: Introductionmentioning

confidence: 99%

“…A critical point in determining platinum in real matrices by CAdSV is the set-up of specific mineralization treatments, since the method is heavily affected by minimum traces of organic substances [17]. A research program was consequently initiated in this laboratory, for validating analytical procedures suitable for quantifying platinum in real samples of alimentary and environmental concern (waters, beverages, foods, vegetables, soils).…”

Section: Introductionmentioning

confidence: 99%

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Validation of Some Procedures for Quantifying Platinum at sub‐μg/L Level in Some Real Matrices by Catalytic Adsorptive Stripping Voltammetry

2004

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The potential toxicological properties of platinum group elements, usually present in real matrices at sub-ng/g level, explain the increasing interest in developing specific and sensitive analytical methods. In this work, a validation study was performed in order to ensure the fitness-for-purposes of procedures developed for quantifying platinum in tap water, beer and lettuce using an extremely sensitive method based on catalytic adsorptive stripping voltammetry. The work involved the estimation of selectivity, detection and quantitation limits, range, accuracy (trueness plus precision), uncertainty of measurement (UOM), robustness and recovery. The results are discussed in the light of the most recent literature findings.

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Section: Limits Of Detection and Of Quantificationmentioning

confidence: 54%

Section: Selectivitymentioning

confidence: 93%

Section: Electrolyte Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Validation of Some Procedures for Quantifying Platinum at sub‐μg/L Level in Some Real Matrices by Catalytic Adsorptive Stripping Voltammetry

2004

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Catalytic Systems in Adsorptive Stripping Voltammetry

2000

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Cathodic Stripping Voltammetric Determination of Platinum in Some Foods and Beverages at ng/g Level Under Statistical Control

2002

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This work was aimed to evaluate the capabilities of catalytic adsorptive stripping voltammetry in quantifying platinum at μg/kg level or lower, under statistical control, in some samples of foods and beverages. Samples of tap water, rosé wine in tetrabrik package, bottled white wine, canned lemon tea, camomile in filter bags, peach fruit juice, UHT semiskimmed milk, wild chicory and bottled red wine (1985 vintage), as well as the in‐house aqueous standard solutions containing 2.0 μg/kg of platinum (used in statistical control), were microwave mineralized. Platinum was quantified at concentration levels lower than 1 μg/kg in tap water, canned lemon tea, camomile in filter bags, UHT semiskimmed milk and wild chicory. In rosé wine in tetrabrik package and bottled white wine the analyte concentration was at μg/kg level, while in the bottled red wine and in the peach fruit juice was not significantly different from zero. Owing to the outstanding sensitivity of the used method, the reproducibility and the precision (expressed as confidence interval at 95% confidence level) of all the results were surprisingly good.

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Simultaneous ultratrace determination of platinum and rhodium by cathodic stripping voltammetry

Cited by 75 publications

References 13 publications

Validation of Some Procedures for Quantifying Platinum at sub‐μg/L Level in Some Real Matrices by Catalytic Adsorptive Stripping Voltammetry

Validation of Some Procedures for Quantifying Platinum at sub‐μg/L Level in Some Real Matrices by Catalytic Adsorptive Stripping Voltammetry

Catalytic Systems in Adsorptive Stripping Voltammetry

Cathodic Stripping Voltammetric Determination of Platinum in Some Foods and Beverages at ng/g Level Under Statistical Control

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