University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Classification: Reference Material -> NRCC -> NOAA-K -> Cod liver

Citations 1

"Comparison Of Sample Digestion Procedures For The Determination Of Arsenic In Certified Marine Samples Using The FI-HG-AAS-technique"
Fresenius J. Anal. Chem. 1997 Volume 357, Issue 7 Pages 817-821
G. Damkröger, M. Grote, E. Janßen

Abstract: For dry ashing, 0.2 g CRM (cod and mussel) were homogenized with 3 g MgO and 40 mL 0.75 M magnesium nitrate, evaporated at 130°C for ~3 h to near-dryness and ashed at 550°C overnight. The ash was dissolved by the dropwise addition of 25 mL 32% HCl and the solutions were diluted to 100 mL with water. For high-pressure ashing, 0.2 g mussel CRM and 0.16 g cod CRM were each mixed with 2 mL 65% HNO3 and 4 mL 30% H2O2 and then ashed with temperature programming from 50-70°C in 30 min, to 120°C in 30 min, then to 300°C (held for 80 min) in 15 min. The resulting clear solutions were diluted to 20 mL with water. For microwave digestion, 0.25 g mussel CRM and 0.2 g cod CRM were each mixed with 3 mL 65% HNO3, and 2 mL 30% H2O2 and irradiated at 250 W for 1 min, left to stand for 1 min, then irradiated at 250 W for 1.5 min, 450 W for 3 min, 850 W for 5 min and 250 W for 1 min. The resulting solutions were diluted to 25 mL with water. The solutions were analyzed for As by flow injection hydride-generation AAS (details given). Mean recoveries of As from mussel and cod were 13% and 2%, respectively, by microwave digestion and 56% and 25%, respectively, by high-pressure ashing. The dry ashing method gave quantitative recoveries from both CRM. Nitrite interference was overcome by the addition of an amino sulfuric acid (350 mM).
Arsenic Sample preparation Sample preparation Sample preparation Spectrophotometry Interferences Method comparison Reference material