General Test Procedure For Oxidisable Substance

PROCEDURE 

To 100 ml of sample in 250 ml conical flask, add 10 ml of dilute sulfuric acid and 0.1 ml of 0.02M potassium permanganate and boil for 5 minutes. The solution remains faintly pink.

Preparation of Nitrate standard Solution (100ppm) for limit Test

PROCEDURE:
Dissolve and dilute 0.163 g of potassium nitrate to 100ml with water. Dilute 1 volume of above solution to 10 volumes with water.

Preparation of Nitrate Standard Solution (2ppm) for Limit Test

PROCEDURE:

Dissolve and dilute 0.163 g of potassium nitrate to 100ml with water. Dilute 1 volume of above solution to 10 volumes with water (100 ppm NO3). Dilute 1 Volume of nitrate standard solution (100 ppm NO3) to 50 Volumes with water.

Preparation of Lead Nitrate Stock Solution (1000ppm) for Limit Test

PROCEDURE:

Dissolve 0.4gm of Lead nitrate in water containing 2ml of nitric acid and add sufficient water to     produce 250.0ml.

Preparation of Iron Standard Solution (10ppm) for Limit Test

PROCEDURE:

Dissolve 7.022 g of ferrous ammonium sulphate in water containing 25 ml of 1M sulphuric acid and add sufficient water to produce 1000 ml. Dilute 1 volume to 100 volumes with water.

Preparation of Chloride Standard Solution (25ppm) for Limit Test

PROCEDURE:

Dilute 5 volumes of a 0.0824 % w/v solution of sodium chloride to 100 volumes with water.

Preaparation of Arsenic Standard Solution (10ppm) for Limit Test

PROCEDURE:

Dissolve 0.33 g of arsenic trioxide in 5 ml of 2M sodium hydroxide and dilute to 250.0ml with         water. Dilute 1 Volume of this solution to 100 volumes with water.

Preaparation of Ammonium standard Solution (1ppm) For Limit Test

PROCEDURE

Dilute 10.0 ml of a 0.0741% w/v solution of ammonium chloride to 25.0 ml with ammonia-free     water. Dilute 1 Volume of the resulting solution to 100 volumes with ammonia-free water, immediately before use.