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一、概述:此法系从矿石中钨、钼的催化极谱测定简化、改进而来.即试样经碱熔后,利用钨、钼在硫酸——苦杏仁酸——氯酸钾介质中的催化反应,使钨在原点电位-0.5伏处出现较灵敏的导数波,其相对灵敏度为1微克/克;钼在0伏处出现常规波,其相对灵敏度为0.5微克/克.钨在0～6微克/25毫升、钼在0～8微克/25毫升范围内,均有较好的线性.按本法试验的测定范围,钨为1～60微克/克;钼为0.5～30微克/克.超出此量可调整取样量.此法经2166个试样的生产考验,钨、钼的合格率分别为98.18和99.55%,不存在系统误差.较熟练的操作人员,其生产效率为25个试样/工作日.
I. Overview: This method simplifies and improves the catalytic polarographic determination of tungsten and molybdenum in ore, ie, after alkali melting, the tungsten and molybdenum are catalyzed by sulfuric acid-mandelic acid-potassium chlorate Reaction, the tungsten at the origin potential of -0.5 volts appear more sensitive derivative wave, the relative sensitivity of 1 microgram / gram; molybdenum at 0 volts at the conventional wave, the relative sensitivity of 0.5 micrograms / gram tungsten in 0 to 6 Micrograms / 25 milliliters, molybdenum in the range of 0 to 8 micrograms / 25 milliliters, have good linearity.According to the law test range, tungsten is 1 ~ 60 micrograms / gram; molybdenum is 0.5 ~ 30 micrograms / gram. Exceeded this volume can adjust the sampling volume.This method after 2166 samples of production test, tungsten, molybdenum pass rates were 98.18 and 99.55%, there is no systematic error.More skilled operators, the production efficiency of 25 tests Sample / working day