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《化学分析计量》 2021年第11期
DOI:10.3969/j.issn.1008-6145.2021.11.013
全自动定氮仪碱解蒸馏法测定植物营养液中硝态氮和铵态氮
高飞,陈素贤,李昌伟,刘瑜,张春红
北京市土肥工作站,北京 100029 
Determination of nitrate nitrogen and ammonium nitrogen in nutrient solution by alkali-hydrolyzed distillation method with automatic nitrogen analyzer
Gao Fei, Chen Suxian, Lin Changwei, Liu Yu, Zhang Chunhong
Beijing Soil Fertilizer Extension Service Station, Beijing 100029, China 
摘要:建立凯氏定氮仪法测定植物营养液中铵态氮和硝态氮的方法。将10 mL植物营养液置于凯氏定氮管中,加入4.5 mol/L氢氧化钠溶液10 mL,利用锌-硫酸亚铁还原剂将营养液中硝态氮(NO3--N)转化为铵态氮(NH4+-N),经蒸馏后被定量吸收在硼酸溶液中,用标准酸进行滴定,计算营养液中总氮含量;不加锌-硫酸亚铁还原剂时,测定营养液中的NH4+-N含量,采用差减法计算出营养液中NO3--N含量。方法的检出限(以铵态氮计)为0.15 mg/L,硝态氮和铵态氮测定结果的相对标准偏差分别为1.23%~2.75%、0.83%~2.84%(n=5),加标回收率为98.7%~100.8%。该方法满足LY/T 1228—2015 《森林土壤氮的测定》标准要求。 
Abstract:The method of determination of nitrate nitrogen and ammonium nitrogen in nutrient solution with automatic nitrogen analyzer after alkali-hydrolyzed distillation was established. 10 mL plant nutrient solution was put into a Kjeldahl tube, added 10 mL 4.5 mol/L sodium hydroxide solution, the nitrate nitrogen (NO3--N) in nutrient solution was converted into ammonium nitrogen (NH4+-N) with zinc-ferrous sulfate reducing agent, which was absorbed quantitatively in boric acid solution after distillation. The total nitrogen content in nutrient solution was calculated with standard acid titration. When no zinc-ferrous sulfate reducing agent was added, the content of NH4+-N-N in nutrient solution was determined, and the content of NO3--N in nutrient solution was calculated by difference subtraction method. The detection limit of the method was 0.15 mg/L(In terms of ammonium nitrogen). The relative standard deviations of determination results were 1.23%-2.75% and 0.83%-2.84%(n=5) for nitrate nitrogen and ammonium nitrogen, respectively, the recoveries ranged from 98.7% to 100.8%. The method meet the requirements of LY/T 1228-2015 Nitrogen Determination Methods of Forest Soils. 
关键词:营养液;铵态氮;硝态氮;全自动定氮仪 
Keywords:nutrient solution; ammonium nitrogen; nitrate nitrogen; automatic nitrogen analyzer 
本文引用格式:
高飞,陈素贤,李昌伟,等.全自动定氮仪碱解蒸馏法测定植物营养液中硝态氮和铵态氮[J].化学分析计量,2021,30(11):59.
Gao Fei,Chen Suxian,Lin Changwei,et al. Determination of nitrate nitrogen and ammonium nitrogen in nutrient solution by alkali-hydrolyzed distillation method with automatic nitrogen analyzer[J]. Chemical Analysis and Meterage,2021,30(11):59. 

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