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.

Determination of Lead in Evaporated Milk by Atomic Absorption Spectrophotometry and Anodic Stripping Voltammetry: Collaborative Study

1973 ◽  
Vol 56 (5) ◽  
pp. 1246-1251
Author(s):  
John A Fiorino ◽  
Robert A Moffitt ◽  
Albert L Woodson ◽  
Raymond J Gajan ◽  
Glen E Huskey ◽  
...  
Keyword(s):  
Atomic Absorption ◽  
Anodic Stripping Voltammetry ◽  
Collaborative Study ◽  
Stripping Voltammetry ◽  
Atomic Absorption Spectrophotometry ◽  
Absorption Spectrophotometry ◽  
Coefficients Of Variation ◽  
Anodic Stripping ◽  
Ppm Level

Abstract A method for the determination of lead in evaporated milk was successfully collaborated by 11 laboratories. Five laboratories used both atomic absorption spectrophotometry (AAS) and anodic stripping voltammetry (ASV) for the determination, 5 used only the atomic absorption method, and 1 used only the polarographic method. Each collaborator received 12 samples, 2 at each of the 5 different levels (0.06–0.95 ppm) and 2 practice samples with a known lead content. Both AAS and ASV were equally suitable for the determination of lead in the concentration range studied. The pooled variation between duplicate determinations was 0.0010 and 0.0016 for the AAS and ASV methods, respectively. For the AAS determinations the coefficients of variation (random error components) decreased from 43% at the lowest Pb level to 4% at the highest level. Although the ASV results did not show the same regularity of decreasing coefficients of variation with increasing Pb level, the coefficients of variation were acceptable: 28% at the 0.06 ppm level and 6% at the 0.22 ppm level. The AAS method has been adopted as official first action and the ASV method as interim official first action.

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.

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.

Lead in Evaporated Milk by Anodic Stripping Voltammetry and Atomic Absorption Spectrophotometry: Cooperative Interlaboratory Study

1978 ◽  
Vol 61 (4) ◽  
pp. 931-936
Author(s):  
Arlene M Sulek ◽  
Edgar R Elkins ◽  
Eric W Zink
Keyword(s):  
Atomic Absorption ◽  
Anodic Stripping Voltammetry ◽  
Lead Level ◽  
Stripping Voltammetry ◽  
Atomic Absorption Spectrophotometry ◽  
Double Blind ◽  
Absorption Spectrophotometry ◽  
Anodic Stripping ◽  
Normal Variability

Abstract The results of a cooperative study on the determination of lead in evaporated milk, using a double blind referee technique, are reported. This study was designed to determine the normal variability of methods currently used for lead analysis by canned food industry laboratories. Twenty-three laboratories participated in this study. Each laboratory was instructed to use atomic absorption spectrophotometry (AOAC 25.065), anodic stripping voltammetry, or carbon rod atomic absorption spectrophotometry. Overall, the results appear to be in close agreement with the spiking levels. The coefficient of variation for all laboratories was 36.0% at the 0.15 ppm lead level and 16.8% at the 0.40 ppm lead level.

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