Analytical Acceptability of Trace Metal Levels Found in Oceanic Waters Around Australia

1978 ◽  
Vol 29 (2) ◽  
pp. 193 ◽  
Author(s):  
A de Forest ◽  
RW Pettis ◽  
G Fabris
Keyword(s):  
Trace Metal ◽  
Graphite Electrode ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Atomic Absorption Spectrophotometry ◽  
Rotating Disc ◽  
Lead And Zinc ◽  
Metal Levels ◽  
Copper Lead ◽  
Random Scatter

Vertical profiles of trace metal levels in the water column for 16 oceanographic stations around Tasmania were determined using anodic stripping voltammetry (ASV) at a mercury-coated graphite electrode (MCGE), a rotating disc glassy carbon electrode (RDGCE) and atomic absorption spectrophotometry (AAS). Cadmium, copper, lead, and zinc were determined by ASV, and iron and nickel were determined by AAS. Variation occurred between MCGE and RDGCE results in the samples analysed for cadmium, copper, lead, and zinc. Statistical analyses of the concentrations found indicated that variations were more likely to be due to procedural blank fluctuations than to change in concentration with depth. For the AAS analyses of nickel, some variation in concentration with depth was apparent after consideration of procedural blanks. However, this variation follows a random scatter pattern.

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.

Determination of Heavy Metals in Foods by Anodic Stripping Voltammetry after Sample Decomposition with Sodium and Potassium Nitrate Fusion

1975 ◽  
Vol 58 (4) ◽  
pp. 777-780 ◽  
Author(s):  
Walter Holak
Keyword(s):  
Heavy Metals ◽  
Nitric Acid ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Lead And Zinc ◽  
Relative Standard ◽  
Anodic Stripping ◽  
Sodium And Potassium ◽  
Copper Lead

Abstract A method is described for the simultaneous determination of several heavy metals in foods. The sample is predigested with nitric acid and decomposed completely by heating with a mixture of sodium and potassium nitrates. The resultant melt containing the metals is then dissolved in dilute nitric acid. After the pH is adjusted to an appropriate value, the metals, such as cadmium, copper, lead, and zinc, are determined by anodic stripping voltammetry. The average recoveries of these metals added to 5 commodities were 98, 98, 96, and 104%, respectively. The relative standard deviations, based on data from analyses of a commodity containing measurable levels of copper, lead, and zinc, were 12.0, 13.0, and 9.7%, respectively.

scholarly journals The Effect of Salinity on the Release of Copper (Cu), Lead (Pb) And Zinc (Zn) from Tailing

2010 ◽  
Vol 1 (1) ◽  
pp. 16-22
Author(s):  
Apriani Sulu Parubak ◽  
Eko Sugiharto ◽  
Mudjiran Mudjiran
Keyword(s):  
Limit Of Detection ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Hanging Mercury Drop Electrode ◽  
Lead And Zinc ◽  
Anodic Stripping ◽  
Determination Of Copper ◽  
Copper Lead

The effects of salinity on the release of copper (Cu), lead (Pb) and zinc (Zn) in tailing sediment have been studied by stripping voltammetry. The purpose of the research is to know the effect of salinity on the release of metals with certain pH, conductivity and variety of metals. Simultaneous determination of copper, lead and zinc in tailing was done by Differential Pulse Anodic Stripping Voltammetry (DPASV) onto hanging mercury drop electrode (HMDE) and nitric acid 65% as support electrolyte. The limit of detection for this method 0.60 µg/L, 0.150 µg/L and 0.238 µg/L for copper, lead and iMc respectively. The stripping solution of 300/00 salinity with pH= 7.85, conductivity= 46.62 mS/cm gives the amounts of released metals as follows :14.867 µg/L Cu, 0.976 µg/L Pb and 6.224 µg/L Zn. These results are higher as compared with the results from 15 0/00 salinity with pH= 7.66, conductivity= 23.22 mS/cm that give released metals of Cu= 7.988 µg/L, Pb= 0.311 µg/L and Zn= 4.699 µg/L. the results from ANOVA suggest that this is due to different in salinity of the solution. It also found that the conductivity does not give any effect. It can be concluded that the higher salinity will that give higher concentration or released metals.

Determination of Copper, Nickel, and Chromium in Foods

1983 ◽  
Vol 66 (3) ◽  
pp. 620-624
Author(s):  
Walter Holak
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Atomic Absorption Spectrophotometry ◽  
Differential Pulse Polarography ◽  
National Bureau ◽  
Pulse Polarography ◽  
Digestion Technique ◽  
Determination Of Copper

Abstract A collaboratively studied method for Pb, Cd, As, Se, and Zn that uses a closed system digestion technique has now been extended to include 3 additional elements, Cu, Ni, and Cr. Cu is determined by either atomic absorption spectrophotometry or anodic stripping voltammetry, depending on the concentration. Ni and Cr are determined by differential pulse polarography. Analysis of National Bureau of Standards reference materials by this procedure gives values in close agreement with the accepted values. Recoveries from applesauce and chicken spiked at 0.6-4 μg/g are in the 92-101% range. The sensitivity of the multielement procedure is 0.34,0.14, and 0.24 μg/g for Cu, Ni, Cr, respectively, at the 90% confidence level.

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