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微量氨态氮的测定,应用最广、研究最多的是奈氏法,该法灵敏、准确。对于钢中氮的测定,因共存元素的干扰,钢样酸溶后,往往采用水蒸气蒸馏法分离后发色,较为费时。本文以强碱分离,提高了分析速度,准确度也能符合要求。 一、仪器与试剂 581型光电比色计; 电动离心机(六孔,400转/分); 刻度离心管(10ml); 标准氯化铵溶液:准确称取3.818g分析
Determination of trace ammonia nitrogen, the most widely used, most studied is the Najib method, the method is sensitive and accurate. For the determination of nitrogen in steel, due to the interference of co-existing elements, steel samples acid-soluble, often after the separation by steam distillation color, more time-consuming. In this paper, the separation of strong alkali to improve the speed of analysis, the accuracy can also meet the requirements. First, the instrument and reagent 581 photoelectric colorimeter; electric centrifuge (six holes, 400 r / min); graduated centrifuge tube (10ml); standard ammonium chloride solution: Weigh accurately 3.818g analysis