锡、钛、锗、钼及亚铁等元素的常量测定,普遍采用隔绝空气加热还原的办法,防止已还原的低价离子重新被空气氧化,然后用氧化还原容量法进行测定。隔绝空气还原的方法主要有两种,一种是用盛封闭液的盖氏漏斗;另一种是用气普发生器产生二氧化碳通入试液瓶。前一种方法比较简单,但在试液冷却时,由于虹吸作用,使封闭液倒流入锥形瓶,增大了试液的体积,改变了试液的酸度,从而影响滴定终点的观察。后一种虽不影响,但仪器复杂不利于操作。作者吸取了这两种方法的优点,设计出双球式还原漏斗 Tin, titanium, germanium, molybdenum and ferrous and other elements of the constant determination, the general use of isolated air heating reduction approach to prevent the reduced low-cost ions re-air oxidation, and then measured by the oxidation-reduction capacity. Isolated from the air there are two main ways to reduce, one is closed with a closed lid Giemsa funnel; the other is the use of gas generator generated carbon dioxide into the test solution bottle. The former method is relatively simple, but when the test solution is cooled, due to the siphon effect, the blocking solution is poured back into the conical flask to increase the volume of the test solution and change the acidity of the test solution, thereby affecting the observation of the titration end point. Although the latter does not affect, but the instrument is not conducive to operation of the complex. The author learned the advantages of these two methods to design a double ball reduction funnel