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中国科学院上海原子核研究所
纸质出版日期:1994-03-01
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[1]尹端沚,郑建,曹本红.DBN-偶氮胂在微量钍的分光光度测定中的应用[J].核技术,1994(03):168-171.
Spectrophotometric determination of trace thorium with DBN-arsenazo[J]. Nuclear techniques, 1994, (3).
以DBN-偶氮胂作为微量钍的分光光度测定的显色剂。结果表明,在1mol/LHCl溶液中,DBN-偶氮胂和钍的络合物在λ=630nm处的表观摩尔吸光系数为8.6×104L·mol-1·cm-1,并且可在高达90倍的铀存在下测定微克级的钍。在0—13μgTh/10ml范围内符合比耳定律,标准曲线线性良好,相关系数r=0.9991。在30%TBP-煤油溶液中采用互溶法,可用DBN-偶氮胂直接测定微量钍。采用乙二醇丁醚为互溶剂,显色剂和钍的络合物稳定性仍能满足要求,比耳定律适用范围不变,标准曲线线性良好。
The application of DBN-arsenazo in determination of trace thorium was described. In aqueous solution
the thorium DBN-arsenazo complex exhibited maximum absorbance at 630nm. Molar absorptivity in 1 mol/L HCl was calculated(εmax=8.6×104L·mol-1 cm-1).The uranium interference can be tole rated even if its intensity is 90 tabes higher than thorium itself. Beer’s law is obeyed in the concentration range of 0-13μg Th/10ml with correlation coefficient r=0.9991. In 30% TBP-kerosene solution
trace thorium can be directly determined by DBN-arsenazo using ethylene glycol monobutyl ether as intersolvent.The thorium DBN- arsenazo complex exhibited maximum absorbance at 620nm in the intersoluble system.Molar absorptivity was calculated(εmax = 4.9×104L·mol-1·cm-1). Beer’s law is obeyed in the concentration range of 0- 14μg Th/10ml.
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