This indicates the degree of turbidity of water, with the degree of turbidity being 1 degree (or 1 ppm) when 1 mg of white clay is contained in 1 liter of distilled water. Water turbidity can be caused by the inclusion of sediment or other suspended solids, chemical changes in dissolved substances, or improper purification methods. Water can be tested using either the turbidimetric method, which compares the water with a standard solution of each turbidity level, or the optical method (wherein light is shone on the liquid to be measured and the turbidity is measured based on the reaction). The water quality standards based on the Water Supply Act stipulate that the turbidity of tap water should be 2 degrees or less. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
水の濁りの程度を示すもので,蒸留水1l中に,白陶土 1mgを含む場合の濁りの度合いを1度 (または 1ppm) とする。水の濁りは土砂や,その他浮遊物の混入,溶存物質の化学的変化,あるいは浄化方法の不適当などによる。検水には各濁度の標準液と比較する比濁法と光学的方法 (測定しようとする液体に光線を当てて,その反応によって濁度を計測する) とがある。水道法に基づく水質基準では,水道水の濁度は2度以下と定められている。
出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
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