Determination of trace quantities of heavy metals in food by anodic voltammetry. Determination of cadmium, lead and copper in beer

1985 ◽  
Vol 50 (5) ◽  
pp. 1141-1146 ◽  
Author(s):  
Alireza Aliakbar ◽  
Milan Popl
Keyword(s):  
Heavy Metals ◽  
Atomic Absorption ◽  
Simplex Method ◽  
Atomic Absorption Spectrophotometry ◽  
Sample Treatment ◽  
Optimum Conditions ◽  
Absorption Spectrophotometry ◽  
Cadmium Lead ◽  
Anodic Voltammetry

The optimum conditions for the determination of Cd, Pb, and Cu in beer were sought by the factorial design and the simplex method approaches. Two methods of sample treatment were used, viz. mineralization and mineralization combined with ashing. The values obtained, 0.32 μg l-1 for Cd, 15.6 μg l-1 for Pb, and 64.7 μg l-1 for Cu, were compared with those obtained by atomic absorption spectrophotometry.

A Simplified Determination of Urinary Cadmium, Lead, and Thallium, with Use of Carbon Rod Atomization and Atomic Absorption Spectrophotometry

1973 ◽  
Vol 19 (9) ◽  
pp. 954-958 ◽  
Author(s):  
Norman P Kubasik ◽  
Michael T Volosin
Keyword(s):  
Atomic Absorption ◽  
Matrix Effects ◽  
Atomic Absorption Spectrophotometry ◽  
Small Sample ◽  
Absorption Spectrophotometry ◽  
Coefficients Of Variation ◽  
Standard Additions ◽  
Cadmium Lead ◽  
Carbon Rod Atomizer

Abstract Lead, cadmium, and thallium are determined in a single 3-ml urine sample. The three metals, simultaneously chelated with sodium diethyldithiocarbamate, are extracted (at pH 3-7) into methyl isobutyl ketone (isopropylacetone), and the carbon rod atomizer, in conjunction with atomic absorption spectrophotometry, is used to analyze the extracts. Small sample requirements (1.6 µl) permit the extraction to be carried out in small-volume disposable glassware, with use of disposable pipets. Within-run coefficients of variation were all less than 5%; recovery ranged from 96-106%. Several normal urinary constituents, added in excess, negligibly affected recoveries. Ethylenediaminetetraacetate in the urine inhibited recovery of lead; this was reversed by adding excess calcium to the urine before extraction. The method of standard additions was used to compensate for differences between standards and unknowns caused by matrix effects.

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