摘要
探讨了利用连续流动分析仪测定水溶肥料中的硝态氮的方法。选择含腐植酸、有机、微量元素、大量元素等4类水溶肥料样品,采用水振荡浸提试样,利用连续流动分析仪对浸提液中硝态氮的含量进行测定,并与紫外分光光度计测定数据进行对比,探讨利用连续流动分析仪测定化学肥料中硝态氮含量可行性。结果表明,流动分析仪法的方法检出限为0.008 g/kg;加标回收率在93.2%~101%;测定结果的相对标准偏差在1.7%~8.3%;所得数据与紫外分光光度计测定结果对比分析,t检验结果表明两种方法无显著差异;两种方法测定数据之间拟合方程为y=0.9782x+0.0768,R^(2)=0.9966。结果表明,连续流动分析仪测试速度快,试剂消耗量少,精密度和准确度满足要求,可用于水溶肥料硝态氮含量的分析测定。
The objective is to study the method for determining nitrate nitrogen in water-soluble fertilizers using a continuous flow analyzer(CFA).Four types of water-soluble fertilizer samples containing humic acid,organic,trace-element and macro-element were selected.Samples were extracted using hot water with a shaker and then nitrate concentration of extracted samples was measured using AA3 CFA.Moreover the detected results were compared with the data obtained by the method of ultraviolet(UV)spectrophotometry.The results showed that the detection limit of the method detection limit is 0.008 g/kg.The recovery was 93.2%to 101%.The relative standard deviation of the determination results is between 1.7%and 8.3%.The t-test results showed that there was no significant difference of the measured data between the two methods of UV spectrophotometry and the CFA.The fitting equation between the two methods was y=0.9782x+0.0768,R^(2)=0.9966.The results suggested that this developed CFA method had high precision and accuracy that could meet the requirements for determination of nitrate content in water-soluble fertilizers.
作者
李亚丽
孔令娥
刘蜜
汪洪
苏志明
LI Yali;KONG Ling′e;LIU Mi;WANG Hong;SU Zhiming(Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China;China National Center forQuality Supervision and Test of Chemical Fertilizers(Beijing),Beijing 100081,China;Laboratory of Quality and Safety Risk Assessment forAgricultural Products from Fertilizer Sources,Ministry of Agriculture and Rural Affairs (Beijing),Beijing 100081,China;China National Accreditation Service for Conformity Assessment,Beijing 100081,China)
出处
《中国无机分析化学》
CAS
北大核心
2022年第1期121-126,共6页
Chinese Journal of Inorganic Analytical Chemistry
基金
国家重点研发计划项目(2018YFD0201203)
国家农产品质量安全风险评估项目(GJFP2019035,GJFP2019037)
中央级公益性科研院所基本科研业务费专项资助项目(Y2019PT20-04,1610132019018)。
关键词
连续流动分析仪
紫外分光光度计
水溶肥料
硝态氮
continuous flow analyzer
UV spectrophotometer
water-soluble fertilizer
nitrate nitrogen
