The potential ammonium oxidation test provides information on the current activity of the respective microorganisms at the sampling time point, whereas the effect on nitrogen transformation is based on the total nitrate concentration per test concentration and sampling day.
Estimations were based on the mean nitrate contents between 1985 and 1989, in which distinction for some vegetables (e.g., endive, lettuce) was made between summer and winter.
Plasma nitrate levels were measured according to the method of Bories and Bories [ 11], using an enzymatic one step methodology based on the reduction of nitrate by nitrate reductase from Aspergillous species in the presence of β-NADPH and FAD.
Electrochemical biosensors for nitrate determination are developed based on the immobilization of nitrate reductase (NR) within two different redox matrixes, one being a pure organic polymer and the other a clay-polypyrrole composite.
Based on the production of nitrate reductase, 95 strains were attributed to the ovis biovar (nitrate reduction negative) and three to the equi biovar (nitrate reduction positive).
Modern agriculture is based on the notion that nitrate is the main source of nitrogen (N) for crops, but nitrate is also the most mobile form of N and easily lost from soil.
The results of model-based clustering showed that the bivariate normal mixture model, which was based on the covariance of nitrate and fluoride, was more robust than multivariate analysis, and provided better discrimination between the anthropogenic and natural groundwater groups.
The determination is based on the reaction of nitrate ions with benzoic acid derivates in the presence of sulfuric acid resulting in a red nitro compound that is determined photometrically.
