"Application Of Photoacoustic Spectrometry To Flow Injection Analysis"
Anal. Chim. Acta
1995 Volume 308, Issue 1-3 Pages 20-27
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I. Carrer, P. Cusmai, E. Zanzotter, W. Martinotti,* and F. Realini
Abstract:
The cited method was used to determine nitrite, nitrate, Fe, NH3 and phosphate ions in water. Excitation was performed with a Q-switched Nd:YAG laser equipped with a 2nd harmonic generator for the determination of nitrite, nitrate and Fe at 532 nm. The same laser was used to pump the dye laser for the detection of NH3 at 632 nm and phosphate at 810 nm. The generated acoustic wave was detected by an acoustic transducer. The FIA manifold allowed the sample solution to be injected into a water carrier stream which was merged sequentially with two reagent streams (R1 and R2) before passing to the detector cell. For the determination of nitrite, R1 and R2 were NH3 buffer and α-naphthylethylenediamine dihydrochloride. The same reagents were used for the determination of nitrate by incorporating a copperized Cd reduction column to reduce nitrate to nitrite. R1 and R2 were hydroxylamine hydrochloride and 1,10-phenanthroline, respectively, for the determination of Fe and ammonium molybdate and antimony potassium tartrate, respectively, for the determination of orthophosphate. The Berthelot reaction was used for the detection of NH3. The detection limits (tabulated) were comparable with those obtained by FIA with spectrophotometric detection for Fe, NH3 and phosphate. For nitrite and nitrate poorer detection limits were obtained.
Ammonia
Iron
Nitrate
Nitrite
Phosphate
Environmental
Laser
Reduction column
Method comparison
