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本文介绍了鱼类样品中总汞的快速测定方法。称取1.0 g鱼样于放有2～3颗沸石的250ml磨口锥形瓶中,加1.0 ml 2%钼酸钠溶液和50ml浓硝酸,在60℃水浴上加热2～3分钟,并随时搅拌,使样品迅速溶解,要防止加热过猛,以免产生大量二氧化氮引起汞的损失。当样品溶解后,加10ml浓硫酸和10ml 6%高锰酸钾溶液,将锥形瓶放在调到中等温度的电热板上,连接导气管及抽气装置,并使溶液至刚沸腾,在消化过程中滴加高锰酸钾溶液使消化液保持品红色和强
This article describes the rapid determination of total mercury in fish samples. Weigh 1.0 g fish samples in 250 ml mill Erlenmeyer flask containing 2 to 3 zeolite, add 1.0 ml 2% sodium molybdate solution and 50 ml of concentrated nitric acid, heated in a water bath at 60 ℃ for 2 to 3 minutes, and at any time Stir so that the sample quickly dissolved, to prevent excessive heating, so as to avoid large amounts of nitrogen dioxide caused by the loss of mercury. When the sample is dissolved, add 10ml of concentrated sulfuric acid and 10ml of 6% potassium permanganate solution, place the conical flask on a hot plate transferred to a moderate temperature, connect the airway and the extraction device, and the solution to just boil, at Digestion during the digestion of potassium permanganate solution to keep the digestive juice magenta and strong