中文摘要：

目的研究姜黄素与铁（Ⅲ）的络舍反应，并建立铁的测定方法。方法采用分光光度法。结果在10^-5～10^3moL／L范围内，姜黄素有不同的吸收光谱；其与铁络合物的吸收波长由430nm红移至496nm，呈增色反应。在pH5．60，浓度为6．51×10^-4mol／L姜黄素液中，络合物为酒红色，λmax=496nm，ε=3．86×10^4L／mol·cm，铁（Ⅲ）的线性范围为0．20—2．00μg／mL。结论在较高浓度下自动聚合的姜黄素与铁（Ⅲ）反应更灵敏。在此基础上，建立的姜黄素测定铁的分光光度法操作简单，选择性较好，灵敏度高，用于自来水中铁（Ⅲ）的测定，结果满意。

英文摘要：

Aim To study the curcumin＇s complex reaction with Fe （Ⅲ） and develop a spectrophotometric method of determination of Iron （Ⅲ）. Methods Spectrophotometry was used. Results In the range of 10^ -5 - 10^-3 mol/ L, curcumin had different absorption spectrograms. The absorption wavelength of the curcumin-Fe （Ⅲ） complex was red shift from 430 nm to 496 nm and its absorbance increased. In the pH 5.6 solution containing 6. 51 ^ 10 ^-4 mol/L curcumin, the complex is claret-red and the molar absorptivity is 3.86 × 10^4 L/mol · cm at λmax = 496 rim. The calibration curve is linear in the range 0. 20 - 2. 00 μg/mL for Fe （Ⅲ）. Conclusion At the higher concentration, polymerized curcumin is more sensitive to react with Fe （Ⅲ）. Based on this, a simple, selective and sensitive spectrophotometric method has been developed and applied satisfactorily to determine Fe（ Ⅲ） in tap water.