Dual-Wavelength Spectrophotometric Determination of Nitrate and Nitrite with 2.6-Xvlenol
Zhang Youxian, Pan Liying, Zhao Min and Gao Waling (Department of Chemistry, Shanxi University, Taiyuan)
Nitrate and nitrite react with 2,6-xylenol in H2SO4 solution. On the basis of this fact we simutaneously determined nitrate and nitrite with dual-wavelength at 318nm-290.5nm and 305.5nm-332.5nm. Beer's law is obeyed in the range 0.00-19.03μg NO3--N/25ml and 0.00-12. 00μg NO2--N/25ml and △ε318;390.5nm is 2.3×103 and △ε305,332.5nm is 4.74×103. After neutralization of solution with NaOH, spectra took place bathochromic shift and nitrate and nitrite can be determined with dual-wavelength at 417.5nm-359nm and 384nm-463.5nm. Beer's law is obeyed in the range 0.00-7.61μg NO3--N/25ml and 0.00-4.8μg NO3--N/25ml and △ε417.5,359nm is 1.13×104 and △ε384,463.5nm is 1.29×104 This methed was applied to determine of nitrate and nitrite in water.