Читать книгу History of the Water Supply of the World онлайн

8 страница из 18

C. Every liquid which, when placed in a white porcelain vessel to the depth of one inch, exhibits under daylight distinct color.

D. Every liquid which contains in solution, in every 100,000 parts by weight, more than two parts of any metal, except calcium, magnesium, potassium and sodium.

E. Every liquid which in every 100,000 parts by weight contains in solution, suspension, chemical combination or otherwise, more than 0.5 metallic arsenic.

F. Every liquid which, after the addition of sulphuric acid, contains in every 100,000 parts by weight more than one part of free chlorine.

G. Every liquid which in every 100,000 parts by weight contains more than one part of sulphur, in the state of sulphuretted hydrogen or of a soluble sulphuret.

H. Every liquid having an acidity superior to that produced by adding two parts by weight of hydrochloric acid to 1000 parts of distilled water.

I. Every liquid having an alkalinity greater than that produced by adding one part by weight of caustic soda to 1000 parts of distilled water.