【摘要】 分析总氮测定过程中影响空白值的一些因素及控制方法。总氮测定过程中,试剂选用和存放时间、蒸馏水纯度、消解温度和时间、环境清洁和操作规范度等均会影响实验空白吸光值。选用分析纯试剂,试剂存放时间小于7d,使用蒸馏水、消解温度控制在12～124℃,操作要无氨、无交叉污染等措施可以有效控制实验空白值。更多还原

【Abstract】 Some factors and control methods affecting the blank value during the determination of total nitrogen are analyzed.During the determination of total nitrogen,reagent selection and storage time,distilled water purity,digestion temperature and time,environmental cleaning and operational specifications,etc.,all affect the experimental blank absorbance.The author proposes that the analysis of pure reagents,reagent storage time less than 7 d,distilled water purity,digestion temperature control at 120-124℃,operation without ammonia,no cross-contamination and other measures can effectively control the experimental blank value.更多还原