Abstract
Nitrogen is an essential element in the environment. If excess nitrogen including is present in water, however, it can result in algae blooming and eventually the destruction of the aquatic ecosystem. Therefore, the determination of in streams, lakes, and effluents of the treatment facilities has long been carried out. The Nessler method is the most common spectrophotometric method to measure in water. However, the result of the method becomes inaccurate if there are interfering substances such as Cl2, Cl−, hardness‐causing compounds (e.g., Mg2+), and Fe2+ in target water samples. In this study, therefore, the traditional Nessler method has been modified to eliminate the effects of interfering substances; the so‐called MS was added to water samples. In addition, the polyvinyl alcohol reagent as a dispersing agent was added to water samples to increase the sensitivity and reproducibility of the method. The modified method could successfully analyze of water samples even with the interfering substance at high concentration.
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