利用全自动定氮仪测定硝化棉的含氮量

Determination of Nitrogen Content in Nitrocellulose by Fully Automatic Nitrogen Determination Analyzer

采用自行研制的全自动定氮仪测定硝化棉的含氮量,研究了样品前处理条件、全自动定氮仪实验参数对检测结果的影响;讨论了实验的准确性与重复性,对全自动定氮仪法与传统合金还原法进行了比较。结果表明,样品前处理采用石墨炉加热,梯度升温的皂化模式;最佳实验参数为:蒸汽体积分数80%、预热30s、还原反应7min、硼酸体积35mL、蒸馏时间8min;与传统合金还原法相比,采用全自动定氮仪检测硝化棉含氮量的方法用时少、操作简单,自动化程度高,减少了人为误差的影响,可保证结果的精度和准确性。

Nitrogen content in nitrocellulose was determined by self-developed fully automatic nitrogen determination analyzer. The effects of sample pretreatment conditions and experimental parameters of fully automatic nitrogen de-termination analyzer on the results were studied. The accuracy and repeatability of test were discussed. Comparison of fully automatic nitrogen determination analyzer method and traditional alloy reduction method was performed. The results show that the sample pretreatment is carried out by graphite oven heating and temperature gradient mode of saponification, the optimum experimental parameters are determined as steam volume fraction of 80% ？ preheating time of 30s,reduction reaction time of 7min, boric acid solution volume of 35mL, distillation time of 8 min, indica-ting that the method of nitrogen content in nitrocellulose detected by fully automatic nitrogen determination analyzer is easy to operate with less time and can ensure the precision and accuracy of the results.