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在需同时测定植株或有机肥料的氮、磷、钾时,若用克氏法消化液,虽可减少操作手续,但若用亚硝酸钴钠法测定钾,有几个问题需加注意。一、不能采用常温沉淀: 常温沉淀即在17-20℃的室温下进行沉淀。这时,影响亚硝酸钴钠钾沉淀的主要因素有二:一是沉淀温度;二是沉淀时溶液的钠钾比值。在用克氏法消解植株样品时,由于各样品消化时间不同,硫酸的分解量亦不同;过去我室推荐的在500毫升三角瓶中消化的方法,需用硫酸冲洗瓶壁上的残渣,这些都会使各瓶中最后的硫酸量不等。在沉淀前,用氢氧化
In the simultaneous determination of nitrogen, phosphorus and potassium in plants or organic fertilizers, the use of Kjeldahl’s digestion solution may reduce the number of operating procedures. However, there are several issues to be aware of when using potassium nitrite for potassium determination. First, can not be used at room temperature precipitation: room temperature precipitation that is precipitation at room temperature 17-20 ℃. At this time, the main factors affecting the precipitation of potassium cobaltous nitrite are two: one is the precipitation temperature; the other is the sodium-potassium ratio of the precipitation solution. In the Klebsiella digestion of plant samples, due to the different sample digestion time, the decomposition of sulfuric acid is also different; room I recommended in the past 500ml flask digestion method, the need to use sulfuric acid to wash the bottle wall residue, these All bottles will make the final amount of sulfuric acid vary. Before precipitation, with hydrogen