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一、概述 鋅焙燒粉中镉的含量,根據以往數據,變動很大,从十万分之幾到千分之幾,但一般在万分之一至万分之三間,最適宜与極譜分析。由於干擾元素之存在,因此必需对基底液作適当之选取。因铟鎘合波,在酸性基底液中测定镉是困难的,或是不可能的。铁与銅在酸性基底液中,其半波電位处於鎘之前,鋅焙燒粉中含铁常在10％上下,含銅雖然不高,然而对镉來說,其比較值亦很高,因此二者均有干擾作用。
First, an overview of zinc roasted powder in the content of cadmium, based on past data, changes, from a few thousandths to a few thousandths, but generally one ten thousandths to three ten thousandths, the most suitable and Polarographic analysis. Due to the presence of interfering elements, it is therefore essential that the base fluid be properly chosen. Due to the indium-cadmium complex, it is difficult or impossible to measure cadmium in an acidic substrate solution. Iron and copper in the acidic substrate solution, the half-wave potential in the cadmium before the zinc roasting powder containing iron often 10% up and down, although the copper is not high, but for cadmium, the comparative value is also high, therefore Both have disturbing effects.