摘要
建立了测定大量元素水溶肥料中硝态氮(NO_3^--N)的抑制电导离子色谱分析方法。在优化的色谱条件下,NO_3^-与水溶肥料中常见的其他阴离子实现了很好的分离。在0~20 mg/L范围内,NO_3^-的峰面积与其浓度线性关系良好(R^2=0.999 9),相对标准偏差为0.54%(n=7),方法检出限为0.007 mg/L,加标回收率为98.52%~102.10%。样品测定结果与行业标准NY/T 1116-2014进行了比较,结果表明,两种方法的测定结果无显著差异。本方法稳定、可靠、省时且干扰小,适合大量元素水溶肥料中硝态氮含量的批量测定。
An ion chromatography method with suppressed conductivity for determination of nitrate nitrogen（ NO_3^--N） in water-soluble fertilizers containing nitrogen,phosphorus and potassium was developed. Under optimized chromatographic conditions,NO_3^- was well separated from other anions commonly found in water-soluble fertilizers. The result showed that the calibration curve was linear in the range of 0 ～ 20 mg/L（ R2= 0. 999 9）. The limit of detection（ LOD） was 0. 007 mg/L. The recoveries were ranged from 98. 52% to 102. 10%（ RSD = 0. 54%,n = 7）. The results were compared with those by the standard NY/T 1116-2014. It showed that there was no significant difference between the two methods. The established method with no interference is stable,reliable and efficient,and can be applied to the analysis of large batches of water-soluble fertilizer samples.
作者
毛红祥
桂素萍
肖植特
李玉兰
陈萌
MAO Hong-xiang, GUI Su-ping, XIAO Zhi-te, LI Yu-lan, CHEN Meng(Chemical Product Supervision ＆ Inspection Station of Yunnan Province, Yunnan Kunming 65022)
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2018年第2期176-178,共3页
Soil and Fertilizer Sciences in China
关键词
离子色谱法
抑制电导
大量元素水溶肥料
硝态氮
ion chromatography
suppressed conductivity
water-soluble fertilizers containing nitrogen, phosphorus and potassium
nitrate nitrogen
