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铜合金和铁矿石中的锡常采用极谱法测定。由于主体元素和共存元素对锡波的干扰,大都需要进行预处理分离,操作繁琐。我们根据锡(Ⅱ)可被硼氢化物还原生成锡化氢,而与溶液中的干扰组分相分离。锡化氢由载气携带流过电化池的一个多孔金膜电极的表面而被氧化。电化池所产生的电位响应与原始溶液中锡的含量有线性关系。我们在前文中把这种方法称为挥气电位法。利用这种方法可以测定许多物质如Hg、As、Sb、Sn,S,CN和Cl等等离子。本文测定了铜合金和铁矿石中的锡。方法的优点是:(1)利用锡化氢的挥发性与气敏电极测定相结合,既消除了共存元素的干扰,又免去了吸收气体的装置;(2)电化池响应快,灵敏度高;(3)取样少,溶样时间短,测定快速,设备简单。
Tin in copper alloys and iron ores is often determined by polarography. As the main elements and coexisting elements of the tin wave interference, most of the need for pretreatment separation, the operation cumbersome. According to tin (Ⅱ), borohydride can be reduced to form hydrogen cyanide, which is separated from the interfering components in the solution. Hydrogen hydrogen is oxidized by the carrier gas carrying through the surface of a porous gold membrane electrode of the electrochemical cell. The potential response generated by the electrochemical cell has a linear relationship with the tin content in the original solution. We referred to this method as the faucet potential method in the previous section. Using this method can be measured many substances such as Hg, As, Sb, Sn, S, CN and Cl and other ions. In this paper, the determination of tin in copper alloys and iron ore. The advantages of the method are as follows: (1) The combination of the volatility of hydrogen sulfide and the gas sensing electrode not only eliminates the interference of coexisting elements but also eliminates the gas absorption device. (2) The electrochemical cell has fast response and high sensitivity ; (3) less sampling, sampling time is short, rapid determination, the device is simple.