Determination of Lead and Cadmium in Foods by Anodic Stripping Voltammetry: I. Development of Method

1982 ◽  
Vol 65 (4) ◽  
pp. 970-977
Author(s):  
Raymond J Gajan ◽  
Stephen G Capar ◽  
Cheryl A Subjoc ◽  
Marion Sanders
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Food Samples ◽  
Food Sample ◽  
Sample Solution ◽  
Lead And Cadmium ◽  
Anodic Stripping ◽  
Acetate Electrolyte

Abstract Food samples are dry ashed at 500 ± 50°C with a 10% aqueous K2SO4 solution used as an ashing aid. The ashed sample is dissolved in 50 mL 2% HNO3. Anodic stripping voltammetry is used to determine lead and cadmium in a mixture of the sample solution and an acetate electrolyte at pH 4.3 ± 0.3. The estimated quantitation limits, based on a 10 g food sample, are 0.005 ppm for cadmium and 0.010 ppm for lead.

Determination of Cadmium in Total Diet Samples by Anodic Stripping Voltammetry

1970 ◽  
Vol 53 (4) ◽  
pp. 705-709
Author(s):  
Harvey K Hundley ◽  
Edward C Warren
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Food Samples ◽  
Final Solution ◽  
Reagent Blank ◽  
Potential Reduction ◽  
Anodic Stripping ◽  
Controlled Potential ◽  
Minimum Sensitivity

Abstract Anodic stripping analysis was investigated for the determination of cadmium in food samples and was found to be as reliable as atomic absorption for the determinative step. A hanging mercury drop is utilized to form an amalgam during controlled potential reduction. The amalgam is then stripped from the electrode by controlled electrolysis with a linearly varying potential. The recorded current measured during the stripping step was a direct linear function of the bulk concentration of cadmium. The minimum sensitivity, 0.01 ppm or 0.03 μg/ml in the final solution, is limited by the reagent blank.

Determination of Background Levels of Lead and Cadmium in Raw Agricultural Crops by Using Differential Pulse Anodic Stripping Voltammetry

1982 ◽  
Vol 65 (4) ◽  
pp. 987-991 ◽  
Author(s):  
R Duane Satzger ◽  
Charles S Clow ◽  
Evelyn Bonnin ◽  
Fred L Fricke
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Standard Reference Materials ◽  
Agricultural Crop ◽  
Lead And Cadmium ◽  
Relative Standard ◽  
Anodic Stripping ◽  
Quantifiable Level

Abstract A method is described for the simultaneous determination of ultratrace levels of lead and cadmium in selected agricultural crop samples by differential pulse anodic stripping voltammetry. Samples are dry ashed at high temperature with H2SO4 as an ashing aid. Techniques are described to control the lead and cadmium blank levels of 2 ng and 0.4 ng, respectively. Typical relative standard deviations for the crop analyses are 13% at 100 ng/g and 25% at 10 ng/g for lead, and 5% at 100 ng/g and 10% at 10 ng/g for cadmium. The lowest quantifiable level, based on 3 g dry sample, is 2 ng/g for lead and 1 ng/g for cadmium. Recovery studies, precision studies, and analyses of NBS Standard Reference Materials demonstrate the accuracy and reproducibility of this technique. A summary of results for over 1700 crop samples is reported.

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