铝还原碘量法测量复杂矿种中的锡

The Tin Iodometry of Complex Ore

铝片还原碘量法,样品经过氧化钠分解后,在盐酸介质中加入EDTA溶液,以铍为载体,再加入氨水使锡和铍共沉淀,达到分离干扰元素的目的,用铝片将Sn+4还原为Sn+2,以淀粉为指示剂,用标准碘液滴定,由此以消耗毫升数,计算出样品中锡的含量.

The sample has been resolved by peroxide-sodium, adds the EDTA solution in the hydrochloric acid medium,takes the beryllium as the loader, adds the ammonia water to cause tin and beryllium co-precipitation again, achieved the separation disturbance element the goal, with the help of aluminum sheet,the Sn^＋4 return to Sn^＋2,take the starch as the indicator, titration with the standard idodine solution, from this consumes a milliliter number, calculates the tin content in the sample.