ppmレベルの亜鉛定量における空試験値変動の原因
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概要
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Improvements were made with regard to the precision in determination of microgram amounts of zinc in aluminum by the solvent extraction-atomic absorption spectrophotometry. Authors examined several causes for lowering the precision, which were due to zinc contamination by its desorption from the inner wall of separating funnels, dissolution of beaker or dehydrating materials, and impurities in reagents used. The major cause was contamination from zinc adsorbed on separating funnels. It could not be removed completely by the brush cleaning with sodium bicarbonate and liquid soaps, by shaking; with tri-n-octylamine methyl isobutyl ketone solution (2 v/v%) for 5 min or by immersiner in nitric acid (1+1) for 24 h. The complete decontamination was possible only by the ultrasonic washing (50 kHz and 35 W) for 10 min in hydrochloric acid (1+1) or nitric acid (1+1). Since rinsing with tapping water causes zinc contamination, it is necessary to rinse with distilled water: the main reason for zinc contamination is considered to be the use of tapping water. Other measures to eliminate the contamination in analysis of aluminum were to dissolve samples in beakers of quartz or polyethylene, but not borosilicate glass, to dehydrate with dry filter paper washed with 5ml of methyl isobutyl ketone and to use reagents selected so as to be lower in zinc impurities. These results will be very useful for the determination of microgram amounts of zinc by using solvent extraction methods in the field of environmental pollution.
- 社団法人日本分析化学会の論文
- 1978-09-05