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一、试液的制备。 1.烧灰溶解法: 取市售干品海带100克,将其充分燃烧成灰,倒入盛50毫升蒸馏水的烧杯中,用玻璃棒搅拌一些时候,挤压出灰汁经过滤,把得到的透明海带灰浸出液装入试剂瓶备用。 2.盐酸浸出法: 取市售干品海带200克,稍加洗净(注意不能较长时间浸泡,以防止海带中碘以I~-形式流失)泥沙和杂质,切细放入预先盛有250毫升0.1N盐酸溶液的烧杯中,浸泡30小时左右(最好能经常翻动搅拌),然后过滤,把得到的透明海带的盐酸浸出液装在试剂瓶中备用。
First, the preparation of test solution. 1. Burning ash dissolution method: Take 100g of dried kelp from the market and burn it into ash. Pour it into a beaker containing 50ml of distilled water. Stir it with a glass rod and squeeze out the ash juice. Transparent kelp leaching solution is loaded into the reagent bottle. 2. Hydrochloric acid leaching method: Take 200g of dried kelp from the market and wash it slightly (note that it cannot be soaked for a long time to prevent the iodine in the kelp from being lost in the I~- form) Sediment and impurities. The beaker with 250 ml of 0.1N hydrochloric acid solution is soaked for 30 hours or so (preferably can be stirred frequently), then filtered, and the obtained transparent kelp hydrochloric acid leaching solution is placed in a reagent bottle for use.