凯氏定氮的交叉污染对^(15)N测定值的影响  

CROSS-CONTAMINATION OF NITROGEN IN DISTILLATION UNIT

作　　者：高占锋[1] 王红云[1] 付才[1] 黄志国[1] 常志强[1] 

机构地区：[1]河北省农林科学院遗传生理研究所,河北石家庄050051

出　　处：《核农学报》2013年第1期99-107,共9页Journal of Nuclear Agricultural Sciences

基　　金：河北省农林科学院"高层次人才创新工程"基金(2011055001)

摘　　要：通过标记硫酸铵的对天然硫酸铵的交叉污染,研究K氏定氮仪冷凝器对NH3的吸附解吸附规律,并比较了不同表面积冷凝器的吸附解吸附规律。结果表明:K氏定氮仪对NH3的吸附量主要取决于冷凝器的表面积,表面积愈大吸附量愈高;吸附于冷凝器表面NH3的解吸附量和解吸附率随蒸馏次数的增加而逐渐减少,其中第1次的解吸率最高,为36.88%～37.91%。The objective of this study paper was to investigate adsorption and desorption of NH3 in condenser of distillation unti by cross-contamination between labeled ammonia sulphate and natural ammonia sulphate,and compare effect of surface area of condenser on the adsorption and desorption of NH3.Results showed that the adsorped amount of NH3 on the condenser mainly depended on increasing of its surface area and the desorption amount and ratio of NH3 from condenser decreased as distillating times increased,the top desorption rate was 36.88%-37.91% at first distillation.

关 键 词：K氏定氮 交叉污染 吸附 解吸附 

分 类 号：S132[农业科学—农业基础科学]