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What is the method for water quality testing? Differences between simple tests and official methods [Basic Knowledge]

A quick method to observe using the color of the reagent and a method to measure according to the procedures set by the government. I will explain the differences between the two uses beyond just convenience.

The methods for water quality testing can be broadly divided into "official methods," which are measured according to standards set by the government, and "simple tests," which are quick ways to obtain values on-site. Rather than one being superior to the other, the choice depends on the purpose of the measurement. In this article, we will refer to quick measurement methods other than official methods as simple tests. ■ What are official methods? The values compared to the legal standards are determined by specific measurement methods. In the regulations that establish discharge standards, it is stipulated that the discharge standards are based on detection values obtained using methods specified by the Minister of the Environment. These notifications specify methods according to various standards, such as the Japanese Industrial Standard K0102. For drinking water, the regulations that set water quality standards also require that tests be conducted using methods established by the Minister of the Environment to ensure compliance with the standards. ■ What is the mechanism of simple tests? A commonly used method involves adding reagents to produce a color and comparing it with a color chart, known as colorimetry. For example, in the DPD method for residual chlorine, 10 mL of water sample is added to a colorimetric tube containing reagents, and the concentration is read by comparing it with a color chart. There is also a method to read the color development using a portable spectrophotometer. Please feel free to consult us for more information.