[Simultaneous determination of cobalt and nickel in catalyst by microwave digestion-dual wavelength equal absorption spectrophotometry].
Catalyst samples are digested in a microwave digestion system. The optimum parameters for microwave digestion are selected. Cobalt and nickel in the mixture of Co2+ and Ni2+ with 4-(2-pyridylazo) resorcinol (PAR) can be determined simultaneously by dual-wavelength equal absorption spectrophotometry. By means of the combination of two methods, Co2+ and Ni2+ in catalyst can be determined rapidly, accurately, and contamination problems avoided. The linear ranges are 0-30 micrograms.25 mL-1 for Co2+ and 0-25 micrograms.25 mL-1 for Ni2+. The recoveries of Co2+ and Ni2+ in synthetic samples are between 98.2%-103.6% and between 97.9%-103.7%, respectively. The relative standard deviations of analytical results in catalyst samples are less than 2.2% for Co2+ and less than 1.8% for Ni2+, and relative errors are less than +/- 2.5% for Co2+ and Ni2+.
Li
L
L
Department of Applied Chemistry, Fushun Petroleum Institute, Fushun 113001.
Zhang
J
J
Gao
C
C
D002384:Catalysis; D003035:Cobalt / Q000737:chemistry*; D008872:Microwaves; D009532:Nickel / Q000737:chemistry*; D012118:Resorcinols / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods
D012118:Resorcinols; D003035:Cobalt; D009532:Nickel; C028398:4-(2-pyridylazo)resorcinol