Preparation and Adding Methods of Nessler's Reagent Having Effects on Determination of Water Quality Ammonia Nitrogen

Abstract

Nessler's reagent spectrophotometry method is used for determination of water quality ammonia nitrogen. The method is affected by many factors, of which Nessler's reagent is the most critical factor. Preparation and adding methods of Nessler's reagent influence the results of determination , which is based on the determination of absorbance and recovery test. Experimental results show that in the strict control of the speed and the amount of HgCl 2 accession, we can get the best effect in the course of preparation of Nessler's reagent. Put a volume of standard solution into a 50mL colorimetric tube, add into Nessler's reagent when diluted with water to about 40mL and then add into water to the reticle (constant volume to 50mL). Determine the absorbance when colors are shown. Draw calibration curve with absorbance as ordinate and mass concentration of ammonia nitrogen as abscissa. The quality control effect of the determination of ammonia nitrogen can be improved by reducing uncertainties.