【摘要】 在硫酸介质中，在非离子表面活性剂乳化剂ＯＰ和邻菲啉共同存在下，铁（Ⅲ）与硫氰酸钾形成红色配合物，其最大吸收波长为５２２ｎｍ，表观摩尔吸光系数为２．０７…１０￣４Ｌ／ｍｏｌ．ｃｍ，铁（Ⅲ）含量在０—５０μｇ／２５ｍｌ范围内符合比耳定律．该法操作简便、快速．选择性好，应用于土壤有效铁和植物中铁的测定．结果令人满意．更多还原

【Abstract】 Based on the formation of red complex of Fe(Ⅲ) with potassium thiocyanate in sulfuric acid medium and the presence of emulgent OP and 1, 10-phenanthroline, a sensitive spectrophotometric method for the determination of Fe(Ⅲ) bas been developed. Its maximum absorption wavelength of the complex is 522 nm. The apparent molar absorptivity is 2.07 × 10￣4 L/mol. cm. Beer’s law is obeyed for 0-50 μg/25 ml of Fe(Ⅲ). The proposed method is simple, rapid and selective. It was applied to the determination of available iron in soil and total iron in plant with satisfactory results.更多还原