硝酸铀酰溶液酸度的测定  

Determination of Uranyl Nitrate Solution Acidity

作　　者：郭国龙[1] 卢阳 龚明明[1] 应长帅 杜凯华 GUO Guolong;LU Yang;GONG Mingming;YING Changshuai;DU Kaihua(Beijing Research Institute of Chemical Engineering and Methallurgy,CNNC,Beijing 101149,China)

机构地区：[1]核工业北京化工冶金研究院,北京101149

出　　处：《湿法冶金》2021年第1期86-89,共4页Hydrometallurgy of China

摘　　要：建立了以草酸钾-氯化镁为掩蔽剂、以滴定法测定高浓度硝酸铀酰溶液酸度的方法,考察了掩蔽剂用量、指示剂种类对测定结果的影响。结果表明:以草酸钾-氯化镁为掩蔽剂,测定结果可靠;当草酸钾(50 g/L)用量10 mL、氯化镁(50 g/L)用量15 mL、以甲基红-溴甲酚绿为指示剂时,方法加标回收率为97%~102%,2个实际样品的测定结果相对标准偏差分别为0.81%、1.57%(n=6)。方法测定结果与自动电位滴定法测定结果一致,测定下限为0.01 mol/L,适合测定高浓度硝酸铀酰溶液酸度。A titration method for determination of uranyl nitrate solution acidity was established using K2C2O4-MgCl2 as masking reagents.The effects of masking reagents amount and indicators on determination were examined.The results show that using K2C2O4-MgCl2 as masking reagents and methyl red-bromocresol green as indicators,the adding standard recovery is 97%~102%,RSD is 0.81%and 1.57%for two real samples(n=6)when K2C2O4 solution(50 g/L)and MgCl2 solution(50 g/L)dosage are 10,15 mL,respectively.The results is in accordance with that of automatic potentiometric titration.The method detection limit is 0.01 mol/L,the determination results are accurate and reliable,and can be applied in determining the acidity of high concentrated uranyl nitrate solutions.

关 键 词：硝酸铀酰 酸度 掩蔽剂 滴定 

分 类 号：O655.2[理学—分析化学]