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[Determination of trace gold by on-line enrichment flow injection flame atomic absorption spectrometry with N1923 levextrel resin].

A new method for the determination of micro amount of gold with N1923 levextrel resin by flow injection on-line separation and flame atomic absorption spectrometry is described. Au (III) absorbed on the resin can be eluted quantitatively using sulphuric-urea solution. The absorption is carried out in 1.0 mol.L-1 HCl medium and the enhancement factor of 32 is achieved for a loading period of 90 s. The detection limit is 0.001 microgram.mL-1. The flow rate of sample injection, the time of extraction, the flow rate of enrichment, the concentration and acidity of eluting and the effect of coexistence element are studied by flame atomic absorption spectrometry. The recoveries of Au are 98.3%-101%. The developed method has been applied to the determination of trace gold in water samples with satisfactory results.