Kato Jun, Higuchi Tetsuo, Kubota Toshio, Igarashi Shukuro
Department of Biomolecular Functional Engineering, Faculty of Engineering, Ibaraki University, Nakanarusawa 4-12-1, Hitachi, Ibaraki 316-8511, Japan.
Anal Chim Acta. 2007 May 8;590(2):245-52. doi: 10.1016/j.aca.2007.03.046. Epub 2007 Mar 25.
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).
痕量的镍（II）可在与亚硫酸钠/过氧化氢体系的自催化反应中作为引发剂（即反应起始物）。基于这一发现，通过使用自催化反应进行时间测量来测定亚微克每升水平的镍（II）。使用上述方法的检测范围为10⁻⁹ - 10⁻⁵ M，检测限（3σ）为8.1×10⁻¹⁰ M（0.047微克每升），在镍（II）浓度为10⁻⁷ M时相对标准偏差为2.66%（n = 7）。该方法应用于长度检测 - 流动注射分析。流动注射分析的检测范围为2×10⁻⁹ - 2×10⁻³ M。检测限（3σ）为1.4×10⁻⁹ M（0.082微克每升），在初始镍（II）浓度为10⁻⁶ M时相对标准偏差为1.86（n = 7）。
