紫外分光光度法测定水溶液中的微量辛基羟肟酸
Determination of Trace Octanohydroxamic Acid in Water by UV Spectrophotometry
摘 要
研究发现在pH 11.02~11.39范围内,紫外吸收光谱中辛基羟肟酸在216 nm处有特征吸收峰,据此建立了测定水溶液中微量辛基羟肟酸的紫外分光光度法。在pH 11.2的Na2HPO4-NaOH缓冲溶液中,辛基羟肟酸在216 nm处的吸光度与其浓度在1.0×10-5~2.1×10-4mol·L-1范围内呈线性关系,检出限(3s)为1.4×10-6mol·L-1。摩尔吸光率为6.613×103L·mol-1·cm-1,是可见分光光度法中铁(Ⅲ)-辛基羟肟酸络合物在535 nm处的摩尔吸光率的10倍。采用此方法测定2个辛基羟肟酸样品,测定值的相对标准偏差(n=5)小于2.0%。
辛基羟肟酸
水
pH
UV spectrophotometry
Octanohydroxamic acid
Water
pH
Abstract
It was found that, at pH 11.02-11.39, the characteristic absorption peak of octanohydroxamic acid in UV adsorption spectra appeared at 216 nm. Based on this fact, UV spectrophotometry was developed for determination of trace octanohydroxamic acid in water. In Na2HPO4-NaOH buffer solution (pH 11.2), linear relationship was found between the absorbance at 216 nm with the concentration of octanohydroxamic acid ranging from 1.0×10-5 to 2.1×10-4mol·L-1, with detection limit (3s) of 1.4×10-6mol·L-1. The molar absorption coefficient was 6.613×103L·mol-1·cm-1, which was 10 times of the molar absorption coefficient of iron (Ⅲ)-octanohydroxamic acid complex at 535 nm in visible spectrophotometry. The proposed method was used to determine two octanohydroxamic acid samples, giving RSDs (n=5) less than 2.0%.
中图分类号 O657.32 DOI 10.11973/lhjy-hx201607007
所属栏目 工作简报
基金项目 国家“973”资助项目(2014CB643403)
收稿日期 2015/7/13
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备注郑 晓(1991-),男,河南驻马店人,硕士研究生,主 要从事化工冶金研究工作。
引用该论文: ZHENG Xiao,LIU Guang-yi,HUANG Yao-guo,LIU Sheng. Determination of Trace Octanohydroxamic Acid in Water by UV Spectrophotometry[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2016, 52(7): 774～777
郑 晓,刘广义,黄耀国,刘 胜. 紫外分光光度法测定水溶液中的微量辛基羟肟酸[J]. 理化检验－化学分册, 2016, 52(7): 774～777
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【3】MARABINI A M, CIRIACHI M, PLESCIA P, et al. Chelating reagents for flotation［J］. Minerals Engineering, 2007,20:1014-1025．
【4】余雪花.水溶液中羟肟酸测定方法的改进［J］.有色金属(选矿部分), 1990(1):23-24．
【5】ZHANG B, ZHONG H. Determination of hydroxamic acids by direct spectrophotometry of colored complex in acidic solution［J］. Res Chem Intermed, 2010,36(5):495-501．
【6】MELHUISH J H, Jr WILLIS R B, WRIGHT C S. Separation and identification of phenolic acids and related compounds by gas chromatography and Fourier transform infrared spectroscopy［J］. J Chem Ecol, 1987,13(2):317-323．
【7】KINCAID R L, MCMULLIN M M, SANDERS D, et al. Sensitive, selective detection and differentiation of salicylates and metabolites in urine by a simple HPTLC method［J］. J Anal Toxicol, 1991,15(5):270-271．
【8】GALLAI Z A, OLIFERENKO G L, SHEINA N M, et al. Quantitative voltammetric determination of hydroxamic acids: SU1097930A1［P］. 1984-06-15．
【9】ZHOU C S, XIONG X G, WU M J, et al. HPLC determination of collectors used for the flotation of heavy metal minerals［J］. Fresenius' J Anal Chem, 1997,357(7):894-896．
【10】PROSKURNIN M A, ORLOVA N V, PIKHTAR A V, et al. Determination of hydroxamic acids by thermal-lens spectrometry［J］. J Anal Chem, 2004,59(5):433-437．
【11】RERICHA R, BLECHTA V, SOUKUPOVA L, et al. On interpretation of a missing spectral band; IR spectra of acidic salts of benzohydroxamic acid［J］. Spectrochim Acta, Part A, 2005,61A(8):1899-1903．
【12】刘邦瑞.螯合捕收剂［M］.北京:冶金工业出版社, 1982:25-39．
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