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DOI:
食品研究与开发:2016,37(16):-
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氯酚红探针吸收光谱法快速测定面制食品中的Fe
(长江师范学院化学化工学院,重庆408100)
Fast Determination of Iron in Flour Food by Absorption Spectrometry with Chlorophenol Red as Probe
(1.chlorophenol red;2.iron;3.flour food;4.absorption spectrometry)
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投稿时间:2015-09-03    
中文摘要: 建立准确测定面制食品中Fe的吸收光谱法。在酸性Tris-HCl缓冲介质中,氯酚红与适量的Fe(Ⅲ)反应生成具有明显正、负吸收峰的离子缔合物,最大正吸收波长和最大负吸收波长分别位于430 nm和572 nm,表观摩尔吸光系数(κ)分别为6.93×104L/(mol·cm)(正吸收)和1.90×105L/(mol·cm)(负吸收)。Fe(Ⅲ)的质量浓度在0~1.40 mg/L范围内遵从比尔定律。
Abstract:A new and accurate absorption spectrometry for quantifying of iron in flour food was developed.In an acidic Tris-HCl buffer medium,an appropriate amount of iron(Ⅲ)was reacted with chlorophenol red,to form a ion association complexes with obvious positive absorption peak and negative absorption peak.The maximum positive absorption wavelength and maximum negative absorption wavelength were at 430 nm and 572 nm respectively.The apparent molar absorptivity(κ)were 6.93×104L/(mol·cm)(positive absorption)and 1.90×105L/(mol·cm)(negative absorption)respectively.Beer's law was obeyed in the range of 0~1.40 mg/L for iron(Ⅲ)mass concentration.
文章编号:201616034     中图分类号:    文献标志码:
基金项目:长江师范学院科技基金资助项目(2016CXX079)
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