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Determination of copper in water and rice samples by flame atomic absorption spectrometry with flow-injection on-line adsorption preconcentration using a knotted reactor

✍ Scribed by Hengwu Chen; Shukun Xu; Zhaolun Fang

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 756 KB
Volume: 298
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(94)00248-7

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✦ Synopsis

A flow-injection on-I& adsorption precontentration flame atomic absorption spectrometric system for the detenninatian of copper was developed. The copper d~eth~ldith~~arba~ate chefate was adsorbed on the walls of a PTFE knotted reactor. The sorbed species was eluted by isobutyl methyl ketone at a flow-rate of 4.1 ml. mix-I. Air ~gmentation between sample and eluent was employed to avoid mixing of the neighbouring phases under fast dution rates. An enhancement factor of 120 and a detection limit of 0.2 fig 1-I Cu were achieved for a 60 s loading period (sample throughput 46 h-'). The relative standard deviations were 1.7% and 3.6% at the 20 pg I-' and 2 pg 1-l Cu levels, respectively, Interference from at least 50 pg 1-l Fe(III) was eliminated by adding ascorbic acid. The method has been applied successfully to determine pg 1-l amounts of copper in drinking water and sea water and JL~ g-l amounts of copper in rice.

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