【摘要】 提出了Fe(-硫氰酸钾-甲基紫三元络合物光度法测定痕量Fe(的新方法。在pH 2的硫酸介质中及聚乙烯醇存在下,Fe(与硫氰酸钾和甲基紫生成组成为1∶4∶1的三元络合物,络合物的最大吸收波长在500 nm处,表观摩尔吸光系数ε=3.65×105L.mol-1.cm-1。在50 mL溶液中,铁量在0.027~6μg范围内符合比尔定律,测定2μg Fe(6次,RSD为2.48%,方法已用于水中痕量铁的测定。更多还原

【Abstract】 A new spectrophotometric method for the determination of trace iron? was developed.In the sulfuric acid medium of pH 2 and in the presence of polyvinyl alcohol,Fe? reacts with potassium thiocyanate and methyl violet to form a complex compound with the composition of 1∶4∶1.The maximum absorption wavelength of the complex is located at 500 nm and the apparent molar absorptivity is ε=3.65×10~5 L·mol~-1·cm~-1.Beer’s law is obeyed in the range of 0.027-6 μg /50 mL.RSD is 2.48% for 2 μg Fe?(n=6).The method has been used to the determination of trace iron in water.更多还原