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多元校正-多波长分光光度法同时测定水样中锌,镉和钴 预览 被引量:3

Application of Multivariate Calibration Methods to the Simul Speetrophotometrics Determination of Zn^2 + , Cd^2 + and Co^2 + in Water Samples
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摘要 提出在pH=8.98的硼砂-硼酸-氯化钠缓冲溶液中,利用锌、镉和钴与显色剂4-(2-吡啶偶氮)间苯二酚(PAR)发生显色反应时的光谱差别来对它们进行定量测定,测量波长范围为300~600nm。研究发现,各显色络合物在其特征峰处的吸光度与待测物浓度成线性,而且在PAR的特征峰处,吸光度也与待测物浓度成线性。本工作利用不同的测量波长范围(300~450,450~600和300~600nm)对这3种金属离子的合成样进行吸光度测量并采集数据,进而采用经典最小二乘法(CLS),主成分回归(PCR)和偏最小二乘(PLS)处理和分析,分析结果表明,波长范围为300~600nm时,用PLS对数据进行处理的结果最好。该方法被用于实际水样的测定,结果令人满意。 This paper developed a simple and sensitive method,based on multivariate calibration,for the simultaneous multiwavelength spectrophotometric determination of Zn^2+ , Cd^2+ and Co^2+ in surface water samples. The method relies on the spectral differences between their complexes with 4 - (2 - pyridylazo) - resorcinol (PAR). The absorbance data were measured and recorded in wavelength range of 300 -600 nm. It was found that both the absorbance of positive peak and negative valley are proportional to the concentration of each analyte. In addition, the results with the absorbance alterations at the two wavelengths analyzed showed that the linear ranges of each analyte at the two wavelengths were the same. Synthetic mixtures of the three metal ions were analyzed, and the data obtained with the three different wavelength ranges (i. e. ,300 -450 nm,450 - 600 nm and 300 -600 nm) were processed by classical least squares (CLS), principal component regression (PCR) and partial least squares (PLS). The prediction results showed that PLS method with the spectral data in the range of 300 - 600 nm gives better results than the two other methods (CLS and PCR) in the the two other different wavelength ranges (450 -600 nm and 300 -600 nm). Following the validation of the proposed method, it was successfully applied for the determination of the three metal ions in two surface water samples.
作者 王勇 倪永年 WANG Yong,NI Yong-nian ( Department of Chemistry, Nanchang University, Nanchang 330031, China)
机构地区 南昌大学化学系
出处 《南昌大学学报:理科版》 CAS 北大核心 2007年第1期 82-84,99,共4页 Journal of Nanchang University(Natural Science)
基金 国家自然科学基金资助项目(20365002 20562009) 江西省自然科学基金资助项目(0620041) 中科院长春应化所电分析化学重点实验室资助项目(SKLEAC2004-3) 长江学者及创新团队资助项目(IRT0540)
关键词 多波长分光光度法 多元校正 同时测定 4-(2-吡啶偶氮)-间苯二酚 Zn^2+ Cd^2+ Co^2+ multiwavelength spectrophotometry multivariate calibration simultaneous determination 4 - (2 - pyridylazo) - resorcinol
作者简介 王勇(1984-),男,硕士生. 通讯作者:倪永年(1945-),男,教授,博士生导师.E-mail:ynni@ncu.edu.cn
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