Standard methods for the examination of water and sewage

by American Public Health Association. Laboratory Section; American Chemical Society; Association of Official Agricultural Chemists

7. Potassium sulfide. An alkaline solution of potassium sulfide made by mixing equal volumes of 10 per cent potassium hydroxide and a saturated aqueous solution of hydrogen sulfide.

8. Potassium oxalate. Crystals.

9. Potassium sulfate. Crystals.

10. Alcohol. Ninety-five per cent.

11. Alcohol. Fifty per cent.

12. Acetic acid. Fifty per cent.

13. Nitric acid. Concentrated acid (Sp. gr. 1.42).

14. Nitric acid. Dilute 1 part of the concentrated acid to 10 parts with distilled water.

15. Hydrochloric acid. (Sp. gr. 1.20.)

16. Sulfuric acid. Concentrated acid (Sp. gr. 1.84).