INDUCED KINETIC SPECTROPHOTOMETRIC DETERMINATION OF MICRO AMOUNTS OF MANGANESE

Based on the induced redox reaction system of Mn(Ⅶ)-Cl--Fe(Ⅱ)-SCN-,a sensitive kinetic spectrophotometric method for determination of microamounts of manganese(Ⅱ) was proposed.The absorption maxima of this reaction system was found at the wavelength of 468 nm,and Beer′s law was obeyed in the range of 0 to 20 μg of Mn(Ⅶ) per 25 mL of solution,with a detection limit of 1.39×10-5g·L-1.In the application to analysis of human hair,tooth paste,and water samples,values of RSD (n=6) obtained were less than 3.5%,and recoveries were in the range of 98.7% to 102.0%.