【摘要】 对可能造成总氮测定空白值过高的各项原因进行了系统分析和试验,发现造成空白值过高的原因主要为过硫酸钾试剂纯度不够,含有的总氮杂质过高所致,采用二次重结晶的方法对过硫酸钾试剂提纯后使用,可大幅度地降低空白值。更多还原

【Abstract】 It is analyzed the all kinds of factors that could cause high blank value in measuring the total nitrogen and then test them in turn,the paper indicates that the reason for the high blank value is impure potassium persulfate,if uses the secondary recrystallization of potassium persulfate to measure,the blank value will be reduced to a larger extent.更多还原