Temperature-Programmable Furnace for Ashing of Foods in Trace Metal Analysis

1977 ◽  
Vol 60 (1) ◽  
pp. 239-240
Author(s):  
Walter Holak
Keyword(s):  
Trace Metal ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Atomic Absorption Spectrophotometry ◽  
Metal Analysis ◽  
Trace Metal Analysis ◽  
Absorption Spectrophotometry ◽  
Anodic Stripping ◽  
Cadmium Lead

Abstract The use of a programmable furnace in preparing samples for determining cadmium, lead, copper, and zinc by differential pulse anodic stripping voltammetry or atomic absorption spectrophotometry is convenient and timesaving. Recovery data for these 4 metals in various foods (tuna, sardines, and milk) were 93— 96% for 0.01—1 ppm cadmium, 96—114% for 0.05—5 ppm lead, 100—108% for 2—10 ppm copper, and 97% for 10 ppm zinc.

scholarly journals A Comparison of Two Methods for the Determination of Thallium in Urine

1983 ◽  
Vol 20 (5) ◽  
pp. 321-326 ◽  
Author(s):  
G J H Bessems ◽  
L W Westerhuis ◽  
H Baadenhuijsen
Keyword(s):  
Solvent Extraction ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Atomic Absorption Spectrophotometry ◽  
Absorption Spectrophotometry ◽  
Extraction Step ◽  
Analytical Recovery ◽  
Anodic Stripping

Two analytical procedures for the determination of thallium in urine are evaluated and compared. The two methods consist of differential pulse anodic stripping voltammetry and flameless atomic absorption spectrophotometry. Both procedures correlated well and were found to be acceptable in terms of precision and analytical recovery. However, a solvent extraction step proved to be necessary for the AAS procedure, and the linearity with respect to the concentration range was rather limited. The method based on DPASV is simple, accurate, precise, and sensitive and does not require any pretreatment of the sample. We therefore recommend the voltammetric procedure for the determination of thallium in urine, as described in this paper.

Measurement of plant-available cadmium in New Zealand soils

Soil Research ◽  
1996 ◽  
Vol 34 (3) ◽  
pp. 441 ◽  
Author(s):  
P Andrews ◽  
RM Town ◽  
MJ Hedley ◽  
P Loganathan
Keyword(s):  
New Zealand ◽  
Graphite Furnace ◽  
Anodic Stripping Voltammetry ◽  
Agricultural Practices ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Atomic Absorption Spectrophotometry ◽  
Absorption Spectrophotometry ◽  
Graphite Furnace Atomic Absorption ◽  
Anodic Stripping

Several methods of measuring plant-available cadmium (Cd) were compared using soils that had accumulated Cd under normal New Zealand agricultural practices (low total Cd concentrations, and phosphatic fertiliser as the dominant Cd source). The study encompassed 9 New Zealand soils with different Cd input histories. Cadmium was extracted from these soils by demineralised water, 0.05 M Na2EDTA, 1 M NH4OAC (pH 7), 0.01 M CaCl2, and 0.05 M CaCl2 and quantified by differential pulse anodic stripping voltammetry (DP-ASV) and graphite furnace atomic absorption spectrophotometry (AAS). The DP-ASV measures the free Cd ion and that associated with labile complexes, but not large organic Cd complexes. Extractable Cd levels were compared with those which are plant-available, as determined by pot studies (lettuce). The 0.01 M CaCl2-extractable Cd measured by AAS and 0.05 M CaCl2-extractable Cd measured by DP-ASV gave the best estimate of plant availability of Cd.

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