ICP-AES法测定有机-无机复混肥中有效磷不确定度的评定  

Uncertainty evaluation of determination of available phosphorus in organic-inorganic compound fertilizer by ICP-AES.

作　　者：王微芝 赵枝刚 刘宏 程金莲 胡发霞 王兴权 Wang Weizhi;Zhao Zhigang;Liu Hong;Cheng Jinlian;Hu Faxia;Wang Xingquan(Qinghai Salt Chemical Products Quality and Technical Supervision Inspection Center,Ge’ermu 816099,China)

机构地区：[1]青海省盐化工产品质量监督检验中心,格尔木816099

出　　处：《分析仪器》2021年第4期95-101,共7页Analytical Instrumentation

摘　　要：采用电感耦合等离子体发射光谱法测定有机-无机复混肥中有效磷,参照CNAS-CL006《化学分析中不确定度的评估指南》和JJF1059.1-2012《测量不确定度的评定与表示》建立数学模型,对有效磷的精密度、回收率进行验证,同时对试验过程中带来的不确定度分量来源进行了分析和评定。结果表明:当样品中有效磷含量为12.64%时,有效磷在95%的置信区间下扩展不确定度为0.42%,对测量过程中的不确定度影响比较大的是配制标准溶液、拟合曲线、测量重复性和加标回收率这四个步骤。Refering to CNAS-CL006 Evaluation Guide for Uncertainty in Chemical Analysis and JJF1059.1-2012 Evaluation and Expression of Uncertainty in Measurement,a mathematical model is established to verify the precision and recovery efficiency of available phosphorus in organic-inorganic compound fertilizer.At the same time,the sources of uncertainty components in the test process are analyzed and evaluated.The results show that when the content of available phosphorus in the sample is 12.64%,the extended uncertainty is 0.42%under the 95%confidence interval.The main sources of uncertainty in the measurement process are standard solution preparation,calibration curve fitting,sample repeatability and spike recovery efficiency.

关 键 词：有机-无机复混肥 有效磷 电感耦合等离子体原子发射光谱 不确定度 

分 类 号：O657.31[理学—分析化学] TQ440.72[理学—化学]