Procedure:

• i) Take 10 ml, of sample in test jar. (Sample to be passed through ion exchange column as per given procedure).
• ii) Add 40 ml. ethyl alcohol (or methyl alcohol).
• iii) Add 5 drops of reagent S-1 and mix. Water will turn light yellow
• iv) Add reagent S-2 drop wise and mix (add slowly, one drop at a time. avoid rapid addition) until color just changes to orange.
• v) Add reagent S-3 drop wise as above. Until color just changes to yellow.
• vi) Add reagent S- 5 drop wise and mix gently until color changes to orange.
• vii) Count the no. of drops of reagent S-5 required calculate sulph ate content (as S04, ppm) as follows. For color change.
• viii) One drop of reagent S-5= 5ppm.

Note : use suitable dilution of sample with distilled water if sulphate content is more than 150 ppm.

Uses : This test is used for to find the sulphates of water in ppm.