Muhammad Ayyaz Khan
Not Available
T.H. Flower
Not Available
ABSTRACT
The development of a gas dialysis system proved that ammonium-N recovery was inversely proportion to acceptor flow rate. The relationship between amonia trapping and acceptor flow rate was considered a crucial parameter and the best flow rate for donor and acceptor streams was chosen for the analysis of water and extract samples. The Technicon silicon gas dialysis membrane showed very low ammonia transference. Polytetrafluoroethene (PTFE) membranes allowed higher amounts of ammonia to be transferred through them. Recovery of ammonia using the standard 6 inch dialyser was 56.7 percent. Analysis at 20 samples per hour showed adequate peak separation and good peak shapes. The standard deviation of the results was between 0.002 and 0.004 for a 1 mg l-1 ammonium-N solution. Calibration curves were linear (y=4.14+15.7x, r2=0.99 and y=5.11+42.82x, r2=0.98). Hence, the developed system was sufficiently precise and reliable for its use in NH4-N determination.
PDF Citation
How to cite this article
Muhammad Ayyaz Khan and T.H. Flower, 1999. Development of a Gas Dialysis System for NH4-N Determination . Pakistan Journal of Biological Sciences, 2: 829-833.
DOI: 10.3923/pjbs.1999.829.833
URL: https://scialert.net/abstract/?doi=pjbs.1999.829.833
DOI: 10.3923/pjbs.1999.829.833
URL: https://scialert.net/abstract/?doi=pjbs.1999.829.833
REFERENCES
- Brown, M.W., 1973. A highly sensitive automated technique for the determination of ammonium nitrogen. J. Sci. Food Agric., 24: 1119-1123.
CrossRefDirect Link - Crowther, J. and J. Evans, 1980. Automated distillation-spectrophotometry procedure for determining ammonia in water. Analyst, 105: 841-848.
CrossRefDirect Link - Martin, G.B. and M.E. Meyerhoff, 1986. Membrane-dialzer injection loop for enhancing the selectivity of anion-responsive liquid-membrane electrodes in flow systems: Part 1. A sensing system for NOx and nitrite. Analytica Chimica Acta, 186: 71-80.
CrossRefDirect Link - Schulze, G., C.Y. Liu, M. Brodowski, O. Elsholz, W. Frenzel and J. Moller, 1988. Different approaches to the determination of ammonium ions at low levels by flow injection analysis. Analytica Chimica Acta, 214: 121-136.
CrossRefDirect Link - Van der Linden, W.E., 1983. Membrane separation in flow injection analysis: Gas diffusion. Anal. Chim. Acta, 151: 359-369.
Direct Link - Van Staden, J.F. and A. Rensburg, 1990. Experimental evaluation of commercially available semi-permeable membranes for use with parallel-plate dialysers in flow injection systems. Analyst, 115: 1049-1054.
CrossRefDirect Link - Willason, S.W. and K.S. Johnson, 1986. A rapid, highly sensitive technique for the determination of ammonia in seawater. Mar. Biol., 91: 285-290.
CrossRefDirect Link