Abstract
Copper in sea-water was determined directly using a graphite furnace atomic absorption spectrometer (GFAAS) with a stabilized temperature platform and matrix modification through addition of ammonium nitrate. Both deuterium background correction and Zeeman effect background correction were used and compared. The detection limit was 0.3–0.4 μg l with injection of a 20 μl aliquot of sea-water sample. The matrix interference was removed completely, so that a calibration curve using deionized water could be used. The detection limit was further reduced to 0.07 μg l using multiple injection (injection of five 20 μl aliquots of sea-water). The accuracy and precision of the developed methods were confirmed by analysis of three kinds of certified reference sea-water.
Published Version
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