10.0的Na2B4O7 -NaOH介质中 ,痕量Co(Ⅱ)催化H2O2 氧化桑色素
为7.6×10 -2 μg/L ,Co(Ⅱ)质量浓度
Trace Co(Ⅱ)catalyzes fading reaction of morin oxidized by hydrogen peroxide in the medium of NaB4O7-NaOH buffer of pH 10.0, and its fading extent is linearly related to the concentration of Co(Ⅱ). A new spectrophotometric method for determining trace Co(Ⅱ)was developed in view of the above with a detection limit of 7.6×10-2 μg/L for Co(Ⅱ) at 415 nm. Beer's law is obeyed in the range of 0.0～50 μg/L for Co(Ⅱ). Combined with solvent extraction separation, the method has been applied to the determination of tr...