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．
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.
关键词
土壤
有效铁
植物
硫氰酸钾
邻菲LUO啉
available iron in soil, total iron in plant, potassium thiocyanate, 1, 10-phenanthroline, emulgent OP, spectrophotometry
