| 摘要 |
PURPOSE:To accurately calculate nitrogen content, by calculating wavelengths absorb ing specific ultraviolet rays with respect to two kinds of standard specimens respective ly indivisually containing nitrate nitrogen and nitrite nitrogen and measuring the ultraviolet absorption of a specimen to be measured on the basis of the calculated wavelengths. CONSTITUTION:Ultraviolet abosorption spectra A, B are measured with respect to standard specimens respectively indivusually containing nitrate nitrogen and nitrite nitrogen, for example, in an amount of 0.1ppm and wavelengths lambda2, lambda3 wherein the differences (E21-E22). (E31-E32) of respective absorbancies of the spectra A, B become equal, are calculated. For example, the difference E2-E3 of absorbancies at lambda2=223nm and lambda2=232nm comes to 0.14. Absorbancies at wavelengths lambda2, lambda3 are measured with respect to a specimen to be measured to calculate the difference E2'-E3' of absorbancies. The difference E2'-E3' of absorbancies and the difference E2-E3 of absorbancies are proportional to nitrogen content. Therefore, the total nitrogen content in a solution mixture containing nitrate nitrogen and nitrite nitrogen can be accurately calculated from the absorbancy measurement of the wavelengths lambda2, lambda3 and this method is useful for the monitoring of environmental contamination. |
