卡尔曼滤波-分光光度法同时分析长江和嘉陵江地表水中的微量铜、镉和锌

Simultaneous Analysis of Trace Cu^(2+),Ca^(2+) and Zn^(2+) in Surface Water from Yangtze and Jialing River with Kalman Filter-Spectrophotometry

1-(2-吡啶偶氮)-2-萘酚(PAN)是一种用于测定微量金属离子浓度的显色试剂,利用PAN研究了这种显色剂与微量金属离子Cu2+,Cd2+和Zn2+形成螯合物的分析条件,即与这三种金属离子形成螯合物的最大吸收光谱性质、pH值影响和螯合反应时间等,并结合卡尔曼滤波算法和可见光度计同时联机的定量测定技术,定量分析了实验室水样、长江和嘉陵江地表水样中微量Cu2+,Cd2+和Zn2+金属离子的浓度。实验室三种金属离子的定量分析回收率在90.2%~106.2%之间,与长江、嘉陵江国控点例行监测数据的比较则表明:该方法的分析结果具有较好的可比性和可靠性。因此,该方法可以方便和直接应用于实际江河流域金属离子污染水样的定量分析。

1-（2-pyridine azo）-2-naphthol（PAN） is one of color reagent to determine the concentration of many trace metal ions. The analyzing conditions of PAN chelating reaction with three metal ions such as Cu^2＋ , Cd^2＋ and Zn^2＋ , the spectral properties at maximum absorption wavelength of these chelate compounds, pH effect and reaction time and so on were studied. Combining with Kalman filter algorithm and spectrophotometric simultaneously determining on-line technology the water samples containing the three metal ion compounds chelated with PAN from our laboratory, Yangtze Rive and Jialing River were analyzed quantitatively under optimal analysis condition, and the recovery is between 90.2%-106% for samples of laboratory. The analysis results for real samples from Yangtze Rive and Jialing River by the Kalman filtering algorithm compared with the corresponding pollution data from the governmental water quality monitoring sites at same sampling sites have well consistency so that the method could be directly, conveniently used for monitoring quantificationally real samples containing multimetal ions in various surface water of rivers simultaneously.