Direct determination of selenium in whole blood by anodic stripping voltammetry

1997 ◽  
Vol 127 (1-2) ◽  
pp. 67-70 ◽  
Author(s):  
Mehmet Sayim Karacan ◽  
G�ler Somer ◽  
?�kr� Kalayci
Keyword(s):  
Whole Blood ◽  
Anodic Stripping Voltammetry ◽  
Direct Determination ◽  
Stripping Voltammetry ◽  
Anodic Stripping

Direct Determination of Lead in Evaporated Milk and Apple Juice by Anodic Stripping Voltammetry: Collaborative Study

1983 ◽  
Vol 66 (6) ◽  
pp. 1414-1420
Author(s):  
Eric W Zink ◽  
Phillip H Davis ◽  
Reginald M Griffin ◽  
Wayne R Matson ◽  
Robert A Moffitt ◽  
...  
Keyword(s):  
Apple Juice ◽  
Fruit Juice ◽  
Anodic Stripping Voltammetry ◽  
Collaborative Study ◽  
Direct Determination ◽  
Stripping Voltammetry ◽  
Sample Type ◽  
Anodic Stripping ◽  
Different Levels

Abstract A method for the direct determination of lead in evaporated milk and in fruit juice with no prior sample digestion was successfully collaborated by 13 laboratories. The anodic stripping voltammetric (ASV) method studied consisted of adding 0.2 mL aliquots of evaporated milk or 0.3 mL aliquots of fruit juice to 2.9 mL of a dechelating reagent, Metexchange. The reagent-sample mixture is then analyzed for lead by ASV with no further sample preparation. Each collaborator received 24 samples, 2 each at 5 different levels (0.07-0.70 ppm for spiked evaporated milk and 0.09-0.87 ppm for spiked apple juice) along with duplicate practice samples of labeled lead content at each of 2 levels for each sample type. All unknowns were coded with random numbers. Approximately 69% of the reporting laboratories had never analyzed either evaporated milk or fruit juice for lead. Average time between receipt of samples and reporting of results was 1.6 days for all laboratories. The pooled variations between duplicate determinations for apple juice and evaporated milk were 0.00059 and 0.00043, respectively. The method was adopted official first action for both fruit juice and evaporated milk.

Rapid Direct Determination of Lead in Evaporated Milk by Anodic Stripping Voltammetry Without Sample Pretreatment

1983 ◽  
Vol 66 (6) ◽  
pp. 1409-1413
Author(s):  
Eric W Zink ◽  
Robert A Moffitt ◽  
Wayne R Matson
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Direct Determination ◽  
Sample Pretreatment ◽  
Stripping Voltammetry ◽  
Relative Standard ◽  
Dry Milk ◽  
Anodic Stripping ◽  
Total Analysis ◽  
Sample Range

Abstract The method presented describes the direct determination of lead in evaporated milk in which the milk ashing step prior to analysis is eliminated. Digital instrument readout units are μg Pb /mL milk. Total analysis time after instrument calibration is less than 3 min per sample. Range of the method is 0.05-1.0 ppm lead in milk, and precision of the method expressed by relative standard deviation of duplicate pairs ranged from 30% at 0.1 μg/mL to 3% at 1.0 μg/mL of lead in milk. The method compares favorably with the AOAC official first action anodic stripping voltammetric method (25.074). In addition, the method appears to work equally well for skim evaporated milk, sweetened condensed milk, and nonfat powdered dry milk when the latter two are reconstituted with water according to product label instructions. Recovery and interference studies are presented.

scholarly journals Direct Determination of Zn, Cd, Pb and Cu in Wine by Differential Pulse Anodic Stripping Voltammetry

Beverages ◽  
2019 ◽  
Vol 5 (1) ◽  
pp. 6 ◽  
Author(s):  
Juliana Maciel ◽  
Michele Souza ◽  
Lisiane Silva ◽  
Daiane Dias
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Direct Determination ◽  
Standard Addition ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Anthropogenic Sources ◽  
Organic Substances ◽  
Addition Method ◽  
Anodic Stripping

Metals in wine can originate from natural and anthropogenic sources and their concentrations have significant effects on wine proprieties as well in its conservation. In this work, direct and simultaneous determinations of Zn, Cd, Pb and Cu in wine samples were carried out by differential pulse anodic stripping voltammetry without any steps of previous pretreatment. The samples analyzed presented concentration levels from 4.64 to 69.3 µg L−1 of Zn, from 1.74 to 5.25 µg L−1 of Cd, from 4.57 to 17.9 µg L−1 of Pb and from 1.0 to 10.3 µg L−1 of Cu. Accuracy was evaluated with the standard addition method and recoveries ranged from 82.5 and 130.8% for Zn, from 85.7 to 107.0% for Cd, from 89.7 to 101.0% for Pb and from 81.4 to 105.9% for Cu. With the application of this method, it was possible to quantify the metals in a simple and easy way not requiring sample preparation or other approaches for the destruction of organic substances.

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