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Aim: To perform the limit test for heavy metals for the given sample. Requirements: Nessler cylinders, 1ml bulb pipette, dilute acetic acid, dilute ammonia solution, hydrogen sulphide solution, pH paper: 3-4 range, lead standard solution (20 ppm Pb), glass rods. Principle: In this experiment, the test color obtained by the reaction of heavy metal impurities …

Aim: To perform the limit test for iron for the given sample. Requirements: Nessler cylinder, 2ml bulb pipette, 20% w/v iron-free citric acid, thioglycolic acid, ammonia solution, iron standard solution (20 ppm Fe), glass rods, red-litmus paper. Principle: In this experiment, the test color (purple) obtained by the reaction of iron impurities with mercaptoacetic acid …