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本文研究了利用多波长最小二乘回归－分光光度法同时测定环境水中的NO3－和NO2－离子含量的方法。通过选择合适的测试条件，利用多波长最小二乘回归计算水中NO3－和NO2－离子的含量，并与最大吸收峰值法进行比较，结果表明，多波长最小二乘回归法优于后者。
In this paper, the method of simultaneous determination of NO3- and NO2- in environmental water by multiwavelength least squares regression-spectrophotometry was studied. By selecting the appropriate test conditions, the content of NO3- and NO2- in water was calculated by using multi-wavelength least squares regression and compared with the maximum absorption peak method. The results show that the multi-wavelength least squares regression method is superior to the latter.