Citation: Zong Ming LUO. HIGHLY SENSITIVE SPECTROPHOTOMETRY OF NIOBIUM[J]. Chinese Chemical Letters, ;1990, 1(2): 131-132. shu

HIGHLY SENSITIVE SPECTROPHOTOMETRY OF NIOBIUM

Zong Ming LUO

Department of Chemical Engineering, Guangdong Institute of Technology, Guangzhou 510090

Received Date: 24 February 1990

In pH 2.0-3.0 medium,niobium(v) forms molybdoniobic acid with sodium molybdate.A spectrophotometric method has been developed for the determination of niobium based on the formation of ion-associate compound of molybdoniobate with butyl Rhodamine B in aqueous solution in the presence of polyvinyl alcohol and 0.4-0.7 mol/L H₂SO₄.The molar absorptivity is 7.5×10⁵ L.mol^-1.cm^-1 for niobium at 585 nm.
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