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一、防挥发: 1.油封:氨水,浓盐酸,浓硝酸等易挥发无机液体,在液面上滴10-20滴矿物油,可以防止挥发(不可用植物油)。 2.水封:二硫化碳中加5毫升水,便可长期保存。汞上加水,可防汞蒸气进入空气。汞旁放些硫粉,一但失落,散布硫粉使遗汞消灭于化学反应中。 3.腊封:乙醚、乙醇、甲酸等比水轻的或易溶性挥发液体,以及萘、碘等易挥及固体,紧密瓶塞,瓶口涂腊。溴除进行原瓶腊封外,应将原瓶置于具有活性炭的塑料筒内,筒口进行腊封。
First, anti-volatilization: 1. Oil seal: ammonia, concentrated hydrochloric acid, concentrated nitric acid and other volatile inorganic liquid, 10-20 drops of mineral oil on the surface of the liquid, can prevent volatilization (not available vegetable oil). 2. Water seal: Add 5 ml of water to carbon disulfide to preserve it for a long time. Add water to mercury to prevent mercury vapor from entering the air. Some sulfur powder was placed next to the mercury and once it was lost, sulfur powder was dispersed to destroy the mercury in the chemical reaction. 3. Wax seal: Ether, ethanol, formic acid and other lighter than water or volatile liquid, and naphthalene, iodine and other volatile and solid, tight cork, bottle mouth wax. In addition to the original bottle wax seal, the bromine bottle should be placed in a plastic cylinder with activated carbon, and the cylinder mouth should be sealed with wax.