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13.
Evaluation of diffusion for inorganic-nitrogen analysis of natural water and wastewater
Khan, S.A. ...
Public concern that agricultural use of N fertilizers may have adverse effectson environmental quality and human health has led to a growing need forreliable data concerning the concentration of ...inorganic N in ground and surface water. A study was conducted to compare the accuracy and precision of simple Mason-jar diffusion methods for quantitative determination of NH+4 and NO-3, in a wide variety of water and wastewater, relative to colorimetry, ion-selective potentiometry, and steam distillation. Good agreement among methods was generally obtained with standard solutions prepared using deionized water; however, substantial differences often were observed with natural and anthropogenic samples, because of either Cl- interference in measurements with the NO-3 electrode or CO2-3 interference in distillation. Analytical accuracy also was evaluated by measuring recovery of N added as (NH4)2SO4 or KNO3, (6 mg N L-1). With most of the samples studied, quantitative recovery (97-103%) was not achieved by potentiometry or distillation. Quantitative recoveries usually were achieved by a manual Berthelot method for colorimetric determination of NH+4, whereas recovery was often incomplete when NO-3 analyses were performed with an automated flow-injection system using Cd2+ reduction. Regardless of the sample matrix, diffusion was always accurate in measuring recovery of NH+4 or NO-3.
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