Drugs and Poisons in Humans - A Handbook of Practical Analysis (Part 49)

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Drugs and Poisons in Humans - A Handbook of Practical Analysis (Part 49)

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Introduction: Nowadays, p-dichlorobenzene (paradichlorobenzene, 1,4-dichlorobenzene) is becoming more popular than naphthalene as a moth repellant (insecticide) worldwide. The discrimination between p-dichlorobenzene and naphthalene is usually difficult only by their smells and their appearances. However, specific gravities of their crystals are different; they are 1.152 and 1.5 for naphthalene and p-dichlorobenzene, respectively. Therefore, when the crystals sink in NaCl-saturated water, it is estimated to be p-dichlorobenzene; while when they float in the same solution, it may be naphthalene [1]. Camphor also gives a similar aromatic smell and appearance, but its discrimination is even easier, because its specific gravity is only 0.99;...

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