Quantitative determination of lead and cadmium in foods by programmed dry ashing and atomic-absorption spectrophotometry with electrothermal atomisation

The Analyst ◽  
1984 ◽  
Vol 109 (2) ◽  
pp. 119 ◽  
Author(s):  
Theo Muys
Keyword(s):  
Quantitative Determination ◽  
Atomic Absorption ◽  
Atomic Absorption Spectrophotometry ◽  
Absorption Spectrophotometry ◽  
Lead And Cadmium ◽  
Dry Ashing

Determination of Copper in Alfalfa

1971 ◽  
Vol 54 (4) ◽  
pp. 951-952
Author(s):  
A Donald Baker
Keyword(s):  
Sample Preparation ◽  
Atomic Absorption ◽  
Hydrofluoric Acid ◽  
Atomic Absorption Spectrophotometry ◽  
Absorption Spectrophotometry ◽  
Dry Ashing ◽  
Wet Ashing ◽  
Aoac Method ◽  
Determination Of Copper

Abstract Copper in alfalfa is determined by atomic absorption spectrophotometry after dry-ashing or wet-ashing of the sample. The method is as precise as and considerably more rapid than the present AOAC method. The standard deviations of the method for wet- and dry-ashing sample preparation were 0.56 and 0.97%, respectively. Recovery of copper from spiked samples was 96—100%. Removal of silica by hydrofluoric acid fuming was not necessary.

Direct determination of lead and cadmium in blood and urine by flameless atomic absorption spectrophotometry.

1979 ◽  
Vol 25 (11) ◽  
pp. 1948-1953 ◽  
Author(s):  
V Lagesson ◽  
L Andrasko
Keyword(s):  
Atomic Absorption ◽  
Direct Determination ◽  
Atomic Absorption Spectrophotometry ◽  
Flameless Atomic Absorption ◽  
Absorption Spectrophotometry ◽  
Lead And Cadmium

Abstract We describe procedures for direct determination of lead and cadmium in blood and urine by flameless atomic absorption spectrophotometry. Before analysis, the samples are pre-ashed in microboats in an ordinary laboratory oven. In this way, many samples can be prepared and pre-ashed simultaneously. We find the procedures presented in this work to be rapid, accurate, and precise.

Minerals in Feeds by Atomic Absorption Spectrophotometry

1967 ◽  
Vol 50 (1) ◽  
pp. 45-50 ◽  
Author(s):  
Mary Heckman
Keyword(s):  
Sample Preparation ◽  
Atomic Absorption ◽  
Atomic Absorption Spectrophotometry ◽  
Absorption Spectrophotometry ◽  
Wet Digestion ◽  
Dry Ashing ◽  
Mineral Mixture ◽  
Calcium Magnesium ◽  
Calcium And Magnesium

Abstract Seventeen laboratories collaborated in the study of analysis of feeds for calcium, magnesium, zinc, manganese, iron, and copper by atomic absorption spectrophotometry. Six feeds and one mineral mixture were analyzed; both dry ashing and wet digestion were used to prepare samples. Three feeds were in the form of solutions to eliminate sample preparation as a variable. Strontium and lanthanum were added to the feed to eliminate phosphorus interference and results were compared. Results indicate that the method is suitable for calcium and magnesium. Further work is needed on the determination of zinc, manganese, iron, and copper.

Determination of Metals in Foodstuffs by Atomic Absorption Spectrophotometry after Dry Ashing: NMKL Interlaboratory Study of Lead, Cadmium, Zinc, Copper, Iron, Chromium, and Nickel

1993 ◽  
Vol 76 (4) ◽  
pp. 798-813 ◽  
Author(s):  
Lars Jorhem ◽  
◽  
G Afthan ◽  
G Cumont ◽  
H P Dypdahl ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Atomic Absorption ◽  
Milk Powder ◽  
Atomic Absorption Spectrophotometry ◽  
Interlaboratory Study ◽  
Absorption Spectrophotometry ◽  
Dry Ashing ◽  
Cadmium Zinc ◽  
Iron Chromium

Abstract An interlaboratory study of a method for determination of lead, cadmium, zinc, copper, iron, chromium, and nickel in foodstuffs by atomic absorption spectrophotometry (AAS) after dry ashing at 450°C was conducted in 16 laboratories. The study was preceded by a practice round of familiarization samples and another round in which solutions were distributed and the metals were determined directly by AAS. The study included 5 different foods (liver paste, apple sauce, minced fish, wheat bran, and milk powder) and 2 composite diets. A single analysis was carried out on each sample. Suitable sample combinations were used as split level combinations for determination of the repeatability standard deviation. The relative reproducibility standard deviation for each of the elements ranged as follows: lead, 74-18% at 0.025-0.28 mg/kg; cadmium, 80-11% (0.002-0.51 mg/kg); zinc, 12-7% (44- 72 mg/kg); copper, 47-10% (0.48-41 mg/kg); iron, 35-9% (2-228 mg/kg); chromium, 48-21 % (0.008- 0.22 mg/kg); nickel, 64-39% (0.025-0.39 mg/kg).

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