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差示脉冲极谱法(硝酸盐催化还原)测定痕量铀,是一种十分灵敏的分析方法。但这一方法仅在排除一系列干扰离子及底液组成保持恒定的条件下才有可能进行。为此,制定了一个以三苯基氧化胂的氯仿溶液萃取铀的简单、快速且选择性良好的分离方法。采用0.02N Na_2CO,反萃取,加入硝酸调至确定的酸度,可将铀转入适于用差示脉冲极谱法测定且重现性良好的底液。已研究过的60余种阳离子和20余种阴离子在很大浓度范围内几乎无干扰,从而提供了多方面应用的可能性。这一方法的检测下限为1 ppb 铀(水溶液),对100ppb 铀的相对标准偏差为±2%。
Differential pulse polarography (nitrate catalytic reduction) Determination of trace uranium, is a very sensitive analytical method. However, this method is only possible to exclude a series of interfering ions and the composition of the bottom fluid remains constant. For this purpose, a simple, rapid and well-selective method for the extraction of uranium from a chloroform solution of triphenylarsenoxide has been developed. Using 0.02 N Na 2 CO, back extraction and nitric acid adjusted to a defined acidity, uranium can be transferred to a bottom liquid suitable for determination by differential pulse polarography and with good reproducibility. More than 60 cations and 20 anions have been studied with little to no interference over a wide range of concentrations, thus offering the possibility of many applications. The lower limit of detection for this method is 1 ppb of uranium (aqueous solution) with a relative standard deviation of ± 2% for 100 ppb uranium.