Discussion on Interference of Soil Nitrite Nitrogen Determination by GPMAS
The paper discussed the possible interference and removal methods of sulfide,formaldehyde,VOCs,acetochlor,acrylamide,urea and other substances in the determination of nitrite nitrogen in soil using gas phase molecular absorption spectroscopy.The experimental results show that sulfide and VOCs have a positive interference on the determination of nitrite nitrogen.When a mixed solution of zinc acetate and sodium acetate is added to the soil extraction solution and the solution is ad-justed to weak alkalinity(pH 10～11),sulfide interference can be eliminated.Heating and boiling the soil extract for 3～5 min-utes can eliminate the interference of VOCs.Formaldehyde,acetochlor,acrylamide,and urea have basically no interference.
gas phase molecular absorption spectroscopysoilnitrogeninterferenceelimination
NETL
NSTL
万方数据
