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快速而且准确测定UO_2(NO_3)_2溶液中的HNO_3浓度,在铀化学特别是在铀工艺学中具有重要意义,尤其在常用酸度计达不到要求的情况下,寻求精确的测定方法就显得很必要。由于铀水解释放出H~+(U~(4+)在pH=2时水解,UO_2~(2+)在pH>3时水解),甚至随着pH升高会出现聚合物沉淀,因此在等当点附近有严重干扰,使测定出现很大误差。本法则比较合适地解决了上述问题。二、试剂与仪器试剂0.1N标准HNO_3;0.01N标准Na_2B_4O_7;N-二甲基甲酰胺(DMF)(pH_0=
The rapid and accurate determination of HNO3 concentration in UO_2 (NO_3) _2 solution is of great importance in uranium chemistry, especially in uranium technology. Especially when the commonly used acidity meters can not meet the requirements, it is very important to seek accurate determination methods necessary. Since U ~ (4 +) is hydrolyzed by uranium hydrolysis and UO_2 ~ (2+) is hydrolyzed at pH> 3, precipitation of the polymer occurs even with increasing pH, There is a serious interference near the point, so that the determination of a great error. This law is more appropriate to solve the above problems. Second, reagents and equipment reagents 0.1N standard HNO_3; 0.01N standard Na_2B_4O_7; N-dimethylformamide (DMF) (pH_0 =