University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Irrigation Solution

Classification: Agricultural -> irrigation solution

Citations 2

"Simultaneous Determination Of Ammonia And Urea With An Asymmetric Merging Zones Flow Injection Configuration"
Anal. Chim. Acta 1989 Volume 221, Issue 1 Pages 173-177
J. S. Cosano, J. L. Calle, J. L. Pinillos, P. Linares and M. D. Luque de Castro

Abstract: The system described includes a dual injection valve and parallel reaction loops for the reaction of NH3 with Nessler`s reagent (1.2 mL min-1) in the presence of 0.1 M NaCl (0.5 mL min-) and of urea with immobilized urease (bound to controlled pore glass). The reaction streams were merged and the urea reaction was terminated by the alkalinity of the medium (0.1 M KH2PO4 at pH 8). Total and free NH3 was determined by absorbance measurement at 380 nm. The coefficient of variation at 2 µg mL-1 were 2.3 and 1.9% for NH3 and urea, respectively, with corresponding determination ranges of 1.0 to 5.0 and 1.0 to 6.0 µg mL-1. The method was applied to the determination of NH3 and urea in agricultural irrigation water.
Ammonia Urea Spectrophotometry Merging zones Dual injection Valve Controlled pore glass Immobilized enzyme

"Determination Of Sodium Carbonate In A Three Component Irrigation Solution System By Kinetic Flow Injection Analysis"
Fenxi Huaxue 1995 Volume 23, Issue 2 Pages 239-239
Li, Y.M.;Chen, L.R.;Nie, X.B.;Han, W.

Abstract: The method was based on the formation of the color complex of Cr3+-EDTA in the presence of carbonate. For determination of sodium carbonate in irrigation solution, the carrier stream (0.2 ml/min) of acetic acid/sodium acetate buffer of pH 5.5 containing CrCl3 (35 mM) and the same carrier stream (0.2 ml/min) containing EDTA (35 mM) were mixed in a mixing coil (50 cm length). A 10 µL portion of the sample was injected into the mixed solution, reacted in a reaction coil (950 cm length) and the absorbance was measured at 520 nm. The calibration graph was linear from 50 µg/ml to 5 mg/ml of carbonate. The detection limit was 5 µg/ml. The RSD (n = 7) was 4.3%. There was no interference from polyacrylamide, sulfonate, sulfate, Ca2+, Mg2+ and NaCl.
Carbonate Spectrophotometry Indirect Interferences Kinetic