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 DIFFERENTIAL PULSE ANODIC STRIPPING VOLTAMMETRY FOR DETERMINATION OF SOME HEAVY METALS IN URANIUM

2010 ◽  
Vol 9 (2) ◽  
pp. 243-246
Author(s):  
Saryati Saryati
Keyword(s):  
Heavy Metals ◽  
Anodic Stripping Voltammetry ◽  
Direct Determination ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Buffer Solution ◽  
Carbonate Buffer ◽  
Relative Standard ◽  
Anodic Stripping

The direct determination of some metals impurity in uranium by using differential pulse anodic stripping voltammetry (DPASV) method at a hanging mercury drop electrode and in a carbonate buffer media was developed. It was found that the carbonate buffer show the strongest affinity for uranium and gives the best separation between the DPASV peaks of heavy metals impurities. The carbonate concentration markedly affects the oxidation and reduction the major and the minor constituents of the uranium samples. In 0.1 M carbonate buffer solution pH 10, copper, bismuth, thalium, lead, cadmium, zinc, could be determined without the removal of the uranium matrix. Recovery and relative standard deviation (RSD) of this method was in the range of 174% - 85.2% for recovery and 36.8% - 1.2% for RSD. The larger error of analytical result was obtained for Zn at low concentration. In general, the analytic results error and RSD decreased with increasing metals concentration.   Keywords: heavy metal determination, differential pulse anodic stripping voltammetry, uranium

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.

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.

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
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