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A STUDY OF SPECTROPHOTOMETRIC DETERMINATION OF MICROGRAM AMOUNTS OF NIOBIUM BY 2-(5’-BROMOPYRIDYL-2’-AZO) -5-DIETHYLAMINOPHENOL
ZHU YU-RUI, WEI FU-SHENG, QU PEI-HUA, SHEN NAI-KUI
Acta Chimica Sinica . 1981, (
5
): 461 -465 .
