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本文根据资料探讨了煤中微量钒的极谱催化法测定。试验了酸熔样小体积快速法,发现钼和铁的干扰严重。通过实验选用铜试剂消除了500微克—1毫克以内钼的干扰;选用邻菲罗啉(1,10—二氮杂菲)掩蔽40毫克(相当40％Fe_2O_3)以内的铁,获得良好结果。根据煤中合铁高的特点(一般含Fe_2O_310—30％,少数煤样可5％)。为保证大批生产需要,试验拟定了碱熔样法,可消除高含量铁的干扰。本法灵敏度达10~(-7)—10~(-8)M。可测定
In this paper, based on the data to explore the determination of trace vanadium in coal by polarographic catalysis. A small volume rapid test of the acid melt was tested and it was found that the interference of molybdenum and iron was serious. The copper reagent was selected to eliminate the interference of molybdenum in the range of 500 micrograms to 1 microgram through the experiment. Good results were obtained by using phenanthroline (1,10-phenanthroline) to mask the iron in 40 micrograms (equivalent to 40% Fe 2 O 3). According to the characteristics of high iron in the coal (usually containing Fe_2O_310-30%, a small number of coal samples can be 5%). In order to ensure a large number of production needs, the trial developed an alkali fusion method to eliminate high levels of iron interference. The sensitivity of this method up to 10 ~ (-7) -10 ~ (-8) M. Measurable