ISSN:
1040-0397
Keywords:
Sequential injection
;
Ammonium
;
Gas diffusion
;
Preconcentration
;
Conductivity
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
A simple sequential injection method for the determination of ammonium with conductometric detection is described. The sample and alkaline solution are sequentially aspirated into a single tubular channel and mixed by flow reversal. The formed ammonia permeates through a gas permeable membrane and is collected on a static acceptor solution. The change in conductance of the acceptor solution is related to the concentration of ammonium ions in the sample. The use of flow reversal and influence of sample residence time on preconcentration are studied. The detection limit can be lowered from 1.5mg L-1 to 0.1 mg L-1 if preconcentration by successive sample flow reversal is used. The relative standard deviation is lower than 3%.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140080416
Permalink