Influence Analysis of Interfering Substances in the Determination of Ammonia Nitrogen in Soil by Gas Phase Molecular Absorption Spectrometry
This paper discusses the influence of sulfide,volatile organic compounds,formaldehyde,acetochlor,ac-rylamide and urea on the determination of ammonia nitrogen in soil,and proposes the removal method of interfer-ing substances.Experimental results show that sulfide,volatile organic compounds,formaldehyde,acetochlor,ac-rylamide and urea all have negative interference on the determination of ammonia nitrogen.If the error of the de-termination value is more than+10％,the interference of sulfide and volatile organic compounds is obvious,while the interference of formaldehyde,acetochlor,acrylamide and urea is small.Adding 1ml(1+1)hydrochloric acid and 0.2ml anhydrous ethanol into the soil extract solution,heating and boiling for 2～3 min,can eliminate the interference of sulfides and volatile organic compounds.
gas phase molecular absorption spectroscopysoilammonia nitrogeninterferenceelimination
万方数据
维普
