烟草总氮分析消化装置的改进

为提高流动分析法测量烟草及烟草制品中总氮消化的效率,根据消化时压力越大,效率越高及蒸汽冷凝回流原理,改进消化管,使样品在较高压力下消化,酸性蒸汽能够得到及时有效的回流.结果表明:同等情况下,改进后的消化管里面的消化液量增加了8.2%,消化液稀释到50 mL时的pH由0.94降低到0.88;使用改进后的消化管,H2SO4、K2SO4和CuSO4的使用量降低10%时,经150 ℃下0.5 h,250 ℃下1 h,350 ℃下1.5 h的消化,比原来消化程序减少2 h,对检测结果无显著性差异,加标回收率在96.92%到103.51%之间.因此,该改进起到了节能、减排、提高工作效率的作用.

Improvement of Digestion Device for Analysis of Total Nitrogen in Tobacco

In order to improve the digestion efficiency to determinate the total nitrogen in tobacco and tobacco products by continuous flow analyzer, the digestive tube was improved by the theory of "the higher the digestive pressure, the higher the efficiency" and "the reflux condensation principle",which made the samples to be digested under high pressure,and the acid steam return timely and effectively. The results showed that the volume of digestive fluid increased 8.2% in the digestive tube after the improvement; the pH decreased from 0.94 to 0.88 when the digestive liquid was diluted to 50 mL under the same condition; when using the improved digestive tube, reducing 10% of the amount of H2SO4, K2SO4and CuSO4, and under the digestion procedure of "150 ℃ for 0.5 h, 250 ℃ for 1 h, 350 ℃ for 1.5 h", there was no significant difference on the determination results, the recovery of standard addition ranged from 96.92% to 103.51%. Therefore, the improvement of the digestion tube could play the role of energy saving, emission reduction and high efficiency .