Goto K, Taguchi S, Fukue Y, Ohta K, Watanabe H
Department of Chemistry, Faculty of Science, Toyama University, Toyama, 930, Japan.
Talanta. 1977 Dec;24(12):752-3. doi: 10.1016/0039-9140(77)80206-3.
A spectrophotometric method for the determination of trace amounts of manganese with 1-(2-pyridylazo)-2-naphthol (PAN) is described. The method is based on the measurement of absorbance of the manganese-PAN chelate solubilized with a non-ionic surfactant, Triton X-100. No extraction procedure is required in the method proposed. High concentrations of calcium, aluminium and magnesium do not interfere. The presence of up to 10 ppm of lead can be tolerated. Iron, cadmium, zinc, cobalt and nickel can be effectively masked with potassium cyanide. Beer's law is obeyed up to 2 ppm of manganese. The molar absorptivity of the manganese-PAN chelate found was 4.4 x 10(4) l. mole (-1). cm(-1) at 562 nm. The overall stability constant of Mn(PAN)(2) in 0.4% Triton X-100 medium is 10(16.8).
描述了一种用1-（2-吡啶偶氮）-2-萘酚（PAN）测定痕量锰的分光光度法。该方法基于测量用非离子表面活性剂Triton X-100增溶的锰-PAN螯合物的吸光度。所提出的方法无需萃取步骤。高浓度的钙、铝和镁不产生干扰。铅含量高达10 ppm时仍可耐受。铁、镉、锌、钴和镍可用氰化钾有效掩蔽。锰含量高达2 ppm时符合比尔定律。在562 nm处测得锰-PAN螯合物的摩尔吸光系数为4.4×10⁴ l·mol⁻¹·cm⁻¹。Mn（PAN）₂在0.4% Triton X-100介质中的总稳定常数为10¹⁶·⁸。
