摘要
本文研究了在吐温-20存在下,于硝酸介质中,铁(Ⅲ)与硫氰酸钾和邻菲啉的显色反应房件。结果表明,所形成的红色配合物的最大吸收波长为518nm,表观摩尔吸光系数为2.06×10~4L·mol-1·cm-1,铁(Ⅲ)含量在0~50μg范围内服从比耳定律。本法具有操作简便,选择性高,重复性好等优点,可不经分离和掩蔽,直接用于植物中铁的测定,结果满意。
It is reported that iron(Ⅲ) forms a red complex with potassium thiocyanate and 1,10-phenanthroilne in the presence of Tween-20 and in nitric acid solution. The absorption maximum wavelength of the complex is 518nm. and it's apparent mole absorptivity is 2. 06× 10~4 L· mol-1· cm^(-1). Beer's law is obeyed for iron in the range of 0-50μ g/25mL,correlation coefficient is 0. 9999. The advantages of this method are simple operation. less time-consuming. high selectivity and repeatability. It has been applied to determine iron in plant with satisfactory results, without the need for preliminary separation and masking steps.
出处
《植物营养与肥料学报》
CAS
CSCD
1997年第1期66-71,共6页
Journal of Plant Nutrition and Fertilizers
关键词
铁
测定
硫氰酸钾
邻菲罗啉
植物
分光光度法
Iron deterination Potassium thiocyanate 1,10-phenanthroline Tween-20 Plant Spectrophotometry