Microwave acid dissolution of soil samples for elemental analysis

1990 ◽  
Vol 68 (2) ◽  
pp. 360-362 ◽  
Author(s):  
Byron Kratochvil ◽  
Sipho Mamba
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Soil Analysis ◽  
Soil Samples ◽  
Acid Dissolution ◽  
Flame Atomic Absorption ◽  
Trace Metal Determination ◽  
Microwave Dissolution

Closed vessel microwave acid dissolution is compared with conventional open vessel methods for the determination of trace zinc and copper in a series of soil samples collected from sugarcane fields in Swaziland. Analytical measurements by flame atomic absorption spectroscopy show that alt the zinc and copper in the samples is released within 7 min in a commercial microwave oven at 400 W. Up to seven 500-mg portions can be handled at a time. Attention must be paid to the amount of organic matter present in a soil so that excess pressure build up does not occur during dissolution. Keywords: microwave dissolution, soil analysis, trace metal determination, atomic absorption spectroscopy.

Determination of Cadmium, Copper, and Lead in Sodium Chloride Food Salts by Flame Atomic Absorption Spectroscopy

1986 ◽  
Vol 69 (5) ◽  
pp. 871-873
Author(s):  
M Jesus Alvarez de Eulate ◽  
Rosa Montoro ◽  
Nieves Ybañez ◽  
Miguel De La Guardia
Keyword(s):  
Sodium Chloride ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Pyrrolidine Dithiocarbamate ◽  
Flame Atomic Absorption Spectroscopy ◽  
Flame Atomic Absorption ◽  
Coefficients Of Variation ◽  
Ammonium Pyrrolidine Dithiocarbamate

Abstract A method for determination of Cd, Cu, and Pb in sodium chloride food salt samples has been developed. It consists of extraction in 4- methj 1-2-pentanonc of the complexes formed with ammonium pyrrolidine dithiocarbamate and further analysis of the extracts by flame atomic absorption spectroscopy. Detection limits in ng/g salt were 0.2 for Cd, 0.7 for Cu, and 10.0 for Pb. The coefficients of variation of 12 independent analyses were 13% for Cd (at a level of 0.4 ppb), 18% for Cu (1.6 ppb), and 5% for Pb (40 ppb). The recoveries were 100 ± 0% for Cd, 115 ± 14% for Cu, and 100 ± 13% for Pb.

Automated determination of copper in undiluted serum by atomic absorption spectroscopy.

1981 ◽  
Vol 27 (8) ◽  
pp. 1438-1440 ◽  
Author(s):  
N Weinstock ◽  
M Uhlemann
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Capillary Tube ◽  
Sample Volume ◽  
Dilution Method ◽  
Flame Atomic Absorption ◽  
Undiluted Serum ◽  
Determination Of Copper

Abstract An injection method has been adapted for the determination of copper concentration in untreated, undiluted serum by flame atomic absorption spectroscopy. Serum, 50 or 100 microliter, is automatically injected by a commercial microprobe system into a plastic cone connected to the capillary tube of the burner, at a rate of 240 samples per hour. The required sample volume is considerably decreased, and sensitivity is increased 20- to 40-fold. After 500 measurements we observed no memory effects, carryover, or clogging of the burner. We discuss common difficulties with calibration standards due to viscosity and other physicochemical interferences, and suggest the use of pooled human serum as a secondary standard. Within-run CV was 1.8%, the day-to-day CV 2.2%. Comparison with a dilution method gave a correlation coefficient exceeding 0.98.

Determination of Trace Elements in Foods by HCl-HNO3 Leaching and Flame Atomic Absorption Spectroscopy

1986 ◽  
Vol 69 (5) ◽  
pp. 868-870
Author(s):  
Richard F Puchyr ◽  
Rubin Shapiro
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Flame Atomic Absorption Spectroscopy ◽  
Flame Atomic Absorption ◽  
Nickel Copper ◽  
Aluminum Iron ◽  
Calcium Magnesium ◽  
Whatman Paper

Abstract Aluminum, iron, tin, zinc, calcium, magnesium, nickel, copper, chromium, cadmium, and potassium in foods can be extracted by HC1- HN03 leaching and determined quantitatively using flame atomic absorption spectroscopy (AAS), with recoveries ranging from 90 to 110%. Thirty to 40 samples of almost any type of food sample can be analyzed routinely for 2 elements in 4-5 h. In contrast, one or 2 days are required when a wet-ash or dry-ash technique is used. Extraction consists of weighing 2-10 g samples into 125 mL Erlenmeyer flasks, adding 20 mL concentrated HCI-HNO3 (9 + 1), then heating in a 82- 93°C water bath for 30 min. After cooling, samples are diluted to volume in 50 mL Nessler tubes and then filtered through No. 541 or 540 Whatman paper. The filtrate is analyzed directly by AAS.

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