Solvent-Floatation-Indirect Photometric Determination of Ascorbic Acid
摘 要
于pH 7.0的磷酸盐缓冲介质中,CTMAB+及I-3离子间借静电引力形成离子缔合物,可将其浮选入5.0 mL苯中,此缔合物在溶剂中,于365 nm处有吸收峰,较简单的I-3离子在相同条件下的吸收峰(350 nm)红移了15 nm.在此溶液体系中存在抗坏血酸时使离子缔合物产生褪色反应,且在抗坏血酸浓度在25 μg/50 mL以内时与吸光度的降低值(ΔA)间呈线性关系.在抗坏血酸浓度为6.0 μg/50 mL时连续测定6次,所得结果的RSD为1.2%,回收率在96%~101%之间.
Abstract
In a phosphate buffer medium of pH 7.0,an associated compound was formed between CTMAB+ and I-3,which was floated into 5.0 mL of benzene.The compound CTMAB+-I-3 showed an absorption maxima at 365 nm,with red-shift of 15 nm from the absorption maxima of I-3 (λmax=350 nm).Color-fading of the associated compound was observed by the presence of ascorbic acid in the reaction system,and linear relationship between the magnitude of decrease in absorbance (ΔA) and the concentration of ascorbic acid was found in the range within 6.0 μg per 50 mL of solution.Test for precision was made at concentration level of 6.0 μg for 6 determination,RSD found was 1.2%,values of recovery found were in the range 96%-101%.
中图分类号 O657.31
所属栏目 工作简报
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收稿日期 2006/1/18
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备注陈会利(1963-),男,辽宁抚顺人,高级工程师,主要从事石油及其产品分析.
引用该论文: CHENG Hui-li,Lv PENG-Fei,YAN Yong-sheng. Solvent-Floatation-Indirect Photometric Determination of Ascorbic Acid[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2007, 43(6): 476~478
陈会利,吕鹏飞,闫永胜. 溶剂浮选-间接光度法测定抗坏血酸[J]. 理化检验-化学分册, 2007, 43(6): 476~478
被引情况:
【1】张爱菊,戴兴德,张小林, "碘-淀粉显色液褪色光度法测定药剂中的维生素C",理化检验-化学分册 52, 339-341(2016)
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参考文献
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【3】Li Qunamin.Indirect Determination of Thiocyanate with Ammonium Sulfate and Ethanol by Entraction Flotation[J].The Analyst,2000,125:1885.
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【5】罗庆尧,邓延倬,蔡汝秀,等.分光光度分析[M].北京:科学出版社,1992:184-186.
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【8】闫永胜,陆晓华.溶剂浮选三元配合物光度法测定痕量铅的研究[J].分析科学学报,2000,16(3):227-229.
【9】闫永胜.溶剂浮选光度法测定痕量铜的研究[J].分析试验室,1999,18(3):93-95.
【10】闫永胜,陆晓华.溶剂浮选光度法间接测定烟草中尼古丁[J].理化检验-化学分册,2001,37(2):78-79.
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【12】张义民,闫永胜,陆晓华.N2-苯浮选光度法测定天然水中痕量碘的研究[J].冶金分析,2002,22(3):13-15.
【13】王庭坚,闫永胜,冯桂荷,等.N2-苯浮选光度法测定碘的研究[J].光谱实验室,2001,18(5):647-650.
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