AN EFFICIENT FLOW-INJECTION SYSTEM WITH ONLINE GAS-DIFFUSION PRECONCENTRATION FOR THE DETERMINATION OF TRACE AMOUNTS OF AMMONIUM NITROGEN AT MU-G L LEVELS BY SPECTROPHOTOMETRY/

Authors
FAN SH MULLER H SCHWEIZER B BOHME W
Citation
Sh. Fan et al., AN EFFICIENT FLOW-INJECTION SYSTEM WITH ONLINE GAS-DIFFUSION PRECONCENTRATION FOR THE DETERMINATION OF TRACE AMOUNTS OF AMMONIUM NITROGEN AT MU-G L LEVELS BY SPECTROPHOTOMETRY/, Fresenius' journal of analytical chemistry, 347(3-4), 1993, pp. 103-106
Citations number
12
Categorie Soggetti
Chemistry Analytical
Journal title
Fresenius' journal of analytical chemistry → ACNP
ISSN journal
09370633
Volume
347
Issue
3-4
Year of publication
1993
Pages
103 - 106
Database
ISI
SICI code
0937-0633(1993)347:3-4<103:AEFSWO>2.0.ZU;2-I
Abstract
An improvement of a flow injection system involving on-line separation and preconcentration by gas diffusion is described for the determinat ion of trace amounts of ammonium nitrogen at mug/L levels by spectroph otometry. A manifold for the concentration step is proposed. The sampl ing frequency is between 60 to 80 samples/h. The detection limit is 0. 8 mug/L. The relative standard deviations of the method are 2.8-1.8% a t 10-15 mug/L levels.