当取100—250mg 铀作测定时,NBL(新布鲁斯成克实验所)滴定铀的方法,得到合适的精密度和准确度。但是,经常要分析铀浓度为1—2 mg/ml 的样品。用 NBL 基本方法样品体积限制在15ml,而用它测定10mg 铀的可靠性,还是不知道。虽然此种样品能用“50ml 步骤”分析,或者将此种样品蒸发浓缩后(当可以采用蒸发办法时采用),再用基本方法分 When taking 100-250 mg of uranium for determination, the NBL (New Brunswick Laboratory) method of titration of uranium gives the proper precision and accuracy. However, samples with uranium concentrations of 1-2 mg / ml are frequently analyzed. With the NBL basic method, the sample volume is limited to 15ml, and it is still unknown whether to use it to determine the reliability of 10mg uranium. Although such a sample can be analyzed using the “50ml step” method or the sample can be evaporated and concentrated (when the evaporation method can be used), the basic method