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有机化合物中氮元素的超微量测定,常用的有小杜马法、扩散法、封管法和氢化还原法。小杜马法快速简便,但由于高空白值而不适于100微克以下样品的分析。扩散法灵敏度较高,但操作繁复费时。氢化还原法准确而快速,适用于多种类型样品分析,但设备稍嫌复杂,且有一定的不安全性。封管法操作尚称简便,准确度也好,但对不同类型的样品要做特殊的预处理。从分解能力和测定的灵敏度考虑,氢化法是比较好的。我们曾设计并试验了氢化催化还原和比色测氨
Ultra-trace determination of nitrogen in organic compounds, commonly used small Duma, diffusion, sealing tube and hydrogenation reduction. The small Duma method is quick and easy, but not suitable for analysis below 100 micrograms for high blank values. Diffusion method of higher sensitivity, but the complicated operation time-consuming. Hydrogenation reduction method accurate and fast, suitable for many types of sample analysis, but the equipment is somewhat complicated, and there is some unsafe. Tube sealing method is still said to be simple, the accuracy is good, but for different types of samples to be special pretreatment. The hydrogenation method is preferable from the standpoint of the decomposing ability and the sensitivity of measurement. We have designed and tested hydrogenation catalytic reduction and colorimetric ammonia