电位法测定茶园土壤pH值的不确定度评定  

Evaluation of Uncertainty in Determination of Tea Garden Soil pH by Potentiometry

作　　者：黄殿贵[1] 黄一帆[1] 龙智翔[1] 陈桂鸾[1] 陆云[1] 黄忠[1] Huang Diangui;Huang Yifan;Long Zhixiang;Chen Guiluan;Lu Yun;Huang Zhong(Guangxi Zhuang Autonomous Region Center for Analysis and Test Research,Nanning 530022,China)

机构地区：[1]广西壮族自治区分析测试研究中心,广西南宁530022

出　　处：《广东化工》2020年第8期156-157,169,共3页Guangdong Chemical Industry

基　　金：广西分析测试研究中心基本科研业务费项目(任务书编号:2019ACZ02)。

摘　　要：采用电位法对茶园土壤的pH值进行测量,评定测量不确定度。建立数学模型,分析不确定度来源,计算不确定度分量并合成。茶园土壤pH值不确定度评定结果为pH=4.06±0.09,p=95%,k=2。不确定度主要来源于水体积,其次为标准溶液和pH仪。使用高精密度的量器和仪器,选择高纯度的标准物质,增加重复测量次数,可减小不确定度。The pH value of tea garden soil was measured by potentiometric method and the uncertainty of measurement was evaluated.The mathematical model is established to analyze the source of uncertainty,calculate and synthesize the uncertainty components.The evaluation result of the uncertainty of the tea garden soil pH value were pH=4.06±0.09,p=95%,and k=2.It mainly comes from water volume,followed by standard buffer and pH meter.The uncertainty can be reduced by using high precision quantifiers and instruments,choosing high purity standard materials,increasing the number of repeated measurements.

关 键 词：茶园土壤 PH值 不确定度 

分 类 号：O65[理学—分析化学]