Time measurement-visual analysis of nickel(II) using autocatalytic reaction with sodium sulfite/hydrogen peroxide system and its application to the length detection-flow analysis.
Trace amounts of nickel(II) can function as a trigger (= reaction initiator) in an autocatalytic reaction with the sodium sulfite/hydrogen peroxide system. Based on this finding, sub-microg L(-1) levels of nickel(II) were determined by a time measurement using the autocatalytic reaction. The detection range using the above method was 10(-9)-10(-5) M, the detection limit (3sigma) was 8.1x10(-10) M (0.047 microg L(-1)), and the relative standard deviation was 2.66% at nickel(II) concentration of 10(-7) M (n = 7). This method was applied to length detection-flow injection analysis. The detection range for the flow injection analysis was 2x10(-9)-2x10(-3) M. The detection limit (3sigma) was 1.4x10(-9) M (0.082 microg L(-1)), and the relative standard deviation was 1.86 at initial nickel(II) concentration of 10(-6) M (n = 7).
Kato
Jun
J
Department of Biomolecular Functional Engineering, Faculty of Engineering, Ibaraki University, Nakanarusawa 4-12-1, Hitachi, Ibaraki 316-8511, Japan.
Higuchi
Tetsuo
T
Kubota
Toshio
T
Igarashi
Shukuro
S
D002138:Calibration; D002384:Catalysis; D017022:Flow Injection Analysis / Q000379:methods*; D006861:Hydrogen Peroxide / Q000737:chemistry; D009532:Nickel / Q000032:analysis*; D013447:Sulfites / Q000737:chemistry; D013662:Tea / Q000737:chemistry; D013696:Temperature; D013997:Time Factors
D013447:Sulfites; D013662:Tea; D009532:Nickel; D006861:Hydrogen Peroxide; C025026:sodium sulfite