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: Vegetable -> ginseng

Citations 1

"Determination Of Trace And Ultratrace Amounts Of Germanium In Environmental Samples By Preconcentration In A Graphite Furnace Using A Flow Injection Hydride-generation Technique"
J. Anal. At. Spectrom. 1993 Volume 8, Issue 4 Pages 577-584
Guanhong Tao and Zhaolun Fang

Abstract: Trace and ultratrace levels of Ge were determined using flow injection (FI) hydride-generation followed by trapping and electrothermal atomization. Samples of garlic, tap water, ginseng and geochemical reference materials were pre-treated (details given) and diluted with 0.15 M or 3 M HCl then propelled into the FI system and merged with a tetrahydroborate reductant. This generated hydrides together with some H, which were separated in a gas - liquid separator, transferred to a Pd-coated graphite furnace pre-heated to 400°C and atomized by heating to 2500°C. Sensitivities and interference effects using different concentration. of HCl were compared. The use of high acidities and FI rather than batch collection led to reduced interference. Interference studies of 13 metals were performed (results given). Calibration graphs were rectilinear up to 0.5 µg L-1 of Ge for use of 0.15 M HCl and up to 2.5 µg L-1 for use of 3 M HCl with detection limits of 0.004 and 0.03 µg l-1, respectively, using 4.5 mL of sample. Coefficients of variation (n = 11) were 2.0% at 0.3 µg L-1 of Ge in 0.15 M HCl and 2.5% at 1.5 µg L-1 in 3 M HCl.
Germanium Spectrophotometry Phase separator Interferences Reference material Preconcentration Ultratrace