Development of a rapid evaluation system for fresh-water quality

Abstract

This paper describes a rapid evaluation system for fresh-water quality. In general, a Stiff diagram and a Trilinear diagram are used for a water quality evaluation, such as ground water. These methods can represent the characteristics of water, but it is difficult to make a diagram and to understand its chemical meaning. The proposed system is able to automatically calculate the necessary values for drawing a diagram from the dissolved ion concentration obtained by ion chromatography, after evaluating the reliability of the measured values. The characteristics of water quality can be instantaneously shown without any complicated process. Moreover, a rapid evaluation system that uses COD, pH, NH₄⁺ and hardness values is presented for the water quality, which enables intuitional indication by a graphical chart.