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《Journal of Anhui Agricultural Sciences》 2008-33
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Simultaneous Determination of NO_3~- and NO_2~- by Means of Ultraviolet Derivative Spectrophotometry and Implementations of MATLAB and SAS for Its Data Treatment

FU Jin-xiang et al(Municipal and Environmental Engineering Faculty,Shenyang Jianzhu University,Shenyang,Liaoning 110168)  
The measurement of NO-3 and NO2-were carried out simultaneously by means of the ultraviolet two-wavelength first derivative spectrophotometry and its data analysis was implemented by the MATLAB and SAS.The results showed that measurement wavelength for NO-3 was 209 nm by means ultraviolet derivative spectrophotometry,however two-wavelength for NO2-were 210.5 and 222 nm respectively by means of the ultraviolet two-wavelength isoabsorption spectrophotometry.Asking for help of SAS,it was showed that the relation between the absolute value y of derivative absorbency and the logarithms of the content x for NO-3 was linear and its R-Square reached 0.965 3,which mathematical equation was y=0.023 55+0.018 34 ln(x).Meanwhile,it was also showed that the relation between y of derivative difference value absorbency and the logarithms of the content x for NO2-was linear and its R-Square reached 0.981 8,which mathematical equation was y=0.019 03+0.003 31 ln(x).The predicted result of the above two kinds of ion content through the analysis of BP algorithm illuminated that the absolute value range of relative error of content prediction for NO-3 and NO2-were 0.155%~2.040% and 0.952%~8.330% respectively.So the combination of MATLAB and SAS could enhance the accuracy and the reliability for data treatment.
【CateGory Index】: X132
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