CAJ | 학술논문

恒电流库仑分析是铀总量测量的准确度精度最高的方法之一，特别适用于纯铀样品中铀总量的测定。自行制备了 U3O8和铀标准溶液，开展了铀总量恒电流库仑法分析的全流程条件实验研究。考察了磷酸用量、亚铁还原剂用量、氧化剂用量、氧化温度、共存离子等的影响。采用优化流程条件，分析了不同含量的铀标准溶液的铀总量，对于50 mg量级铀总量，采用恒电流库仑分析的相对标准不确定度为0.12%。
항전류고륜분석시유총량측량적준학도정도최고적방법지일，특별괄용우순유양품중유총량적측정。자행제비료 U3O8화유표준용액，개전료유총량항전류고륜법분석적전류정조건실험연구。고찰료린산용량、아철환원제용량、양화제용량、양화온도、공존리자등적영향。채용우화류정조건，분석료불동함량적유표준용액적유총량，대우50 mg량급유총량，채용항전류고륜분석적상대표준불학정도위0.12%。
Background:Constant current coulometry is one of the most precise methods in total uranium measurement, especially for pure uranium sample.Purpose: This study aims at the whole experimental flow conditions for total uranium measurement using constant current coloumetry.Methods: U3O8and uranium standard solution were prepared. And various experimental conditions for phosphorus acid dosage, Fe(II) dosage, oxidizer dosage, oxidation temperature and coexisting ionsetc., were reviewed while measuring total uranium of samples with different weights of standard uranium solutions added in.Results: With optimized flow, total uranium weights in different uranium standard solutions were measured. For 50 mg total uranium added in, the combined uncertainty was 0.12% by constant current coulometry.Conclusions: This method can be used to measure total uranium content in pure uranium sample, and phosphorus acid plays a key role. When the concentration of phosphoric acid is more than 10 mol·L?1, the reduction reaction can be conducted at room temperature.