Author: Pharma Tutor

Limit test for Lead

Lead is a most undesirable impurity in medical compounds and comes through the use of sulphuric acid, lead-lined apparatus and glass bottles use for storage of chemicals.

Principle:

The limit test of lead is based on the reaction of lead and diphenylthiocabazone (dithizone) in alkaline solution to form lead dithizone complex which is read in color. Dithizone is green in color in chloroform and leaddithizone complex is violet in color, so the resulting color at the end of the process is red.

Semester 4 Semester 4 || B.pharm Semester 4 Simplified Notes    Subjects in SEMESTER IV:-  BP401T – Pharmaceutical Organic Chemistry III–TheoryBP402T- Medicinal Chemistry I–Theory BP403T- Physical Pharmaceutics II–TheoryBP404T- Pharmacology I–TheoryBP405T- Pharmacognosy and Phytochemistry I–TheoryBP406P- Medicinal Chemistry I–PracticalBP407P- Physical Pharmaceutics II–Practical BP408P- Pharmacology I–PracticalBP409P- Pharmacognosy…