A device that measures the degree of cloudiness of water, that is, turbidity. It is also called a turbidity meter or nephelometer. The unit of turbidity is defined as 1° when 1 mg of kaolin (white china clay) is suspended in 1 liter of distilled water (kaolin degree). Another more accurate unit is the formazin degree measured using a formazin standard solution (aqueous solutions of hydrazinium sulfate and hexamethylenetetramine at specified concentrations, mixed well, and left to stand for 24 hours at approximately 25°C). Measurements are generally performed by preparing several standard solutions with turbidities close to the turbidity of the sample liquid and comparing them with these. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
水の濁りの程度,すなわち濁度を測定する装置。濁り度計,比濁計などとも呼ばれる。濁度の単位はカオリン(白陶土)1mgが蒸留水1l中に懸濁しているときを濁度1゜と定めている(カオリン度)。ほかにより高精度の単位としてはホルマジン標準液(硫酸ヒドラジニウムおよびヘキサメチレンテトラミンをそれぞれ所定の濃度の水溶液にし,よく混合したのち約25℃で24時間放置したもの)によるホルマジン度も用いられている。測定は試料液の濁度に近いいくつかの濁度をもつ標準液を調製しておき,これらとの比較によって行うのが一般である。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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