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DETERMINATION OF CADMIUM, LEAD AND COPPER IN WATER SAMPLES BY FLAME ATOMIC-ABSORPTION SPECTROMETRY WITH PRECONCENTRATION BY FLOW-INJECTION ONLINE SORBENT EXTRACTION
被引:139
作者:
FANG, ZL
[1
]
GUO, TZ
[1
]
WELZ, B
[1
]
机构:
[1] BODENSEEWERK PERKIN ELMER & CO GMBH,DEPT APPL RES,W-7770 UBERLINGEN,GERMANY
来源:
关键词:
D O I:
10.1016/0039-9140(91)80144-O
中图分类号:
O65 [分析化学];
学科分类号:
070302 ;
081704 ;
摘要:
Cadmium, lead and copper were determined in synthetic sea-water, drinking water and the NBS 1643b Trace Elements in Water standard reference material at mu-g/l. levels by flame atomic-absorption spectrometry after on-line preconcentration by sorbent extraction with a flow-injection system. Bonded silica with octadecyl functional groups packed in a micro column of 100-mu-l capacity was used to collect diethylammonium diethyldithiocarbamate complexes of the heavy metals in the aqueous samples. The sample loading time was 20 sec at a flow-rate of 3.3 ml/min. Ethanol or methanol was used to elute the adsorbed analytes into the spectrometer. The sample loading rate, elution rate and pH were optimized. Enrichment factors of 19-25 for Cd, Pb and Cu were achieved at sampling frequencies of 120/hr with precisions of 1.4 1.0 and 1.3% rsd (n = 11), respectively. The detection limits (3-sigma) for Cd, Pb and Cu were 0.3, 3 and 0.2-mu-g/l., respectively. Determination of Cd, Pb and Cu in NBS SRM 1643b showed good agreement with the certified values. Recoveries of Cd and Pb added to sea-water were 95 and 102%, respectively.
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页码:613 / 619
页数:7
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