- 作者: Yogendu Sharma; C. C. Shivahare
- 作者服務機構: Department of Chemistry, Ganjdundwara College, Ganjdundwara, 207242-(INDIA)
- 中文摘要: Niobium (V) reacts with 5, 7-dinitro-8-hydroxyquinoline to form yellowish-orange coloured complex having maximum absorbance at 420 nm in citric acid medium. The reaction is slow at room temperate, it is complete in 15 minutes at temperate 40°. The colour is stable for at least 16 hours. Effects of heating temperate, time, pH, reagent concentration and other variables have been studied. The system confirms the Beer’s law over the concentration range investigated. Optimum condition range for measurement in 10mm cell is 1-12 μg of niobium. The molar absorptivity is 5.327×10.. litre moles¯1 cm¯1. The interference from foreign ions has been evaluated. The metal-ligand ratio of 1:2 was confirmed by Job’s continous variation and mole ratio methods.
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