Roll of acetic acid in limit test for heavy metals
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Limit Test of Heavy Metals ... Adjust the pH between 3 to 4 by adding dilute acetic acid ' Sp' or dilute ammonia solution 'Sp', Adjust the pH
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Limit test of heavy metals is based on the reaction of metallic impurities with hydrogen sulfide in acidic medium to form brownish colour solution. Metals that response to this test are lead, mercury, bismuth, arsenic, antimony, tin, cadmium, silver, copper, and molybdenum. The metallic impurities in substances are expressed as parts of lead per million parts of the substance. The usual limit as per Indian Pharmacopoeia is 20 ppm
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