煤中氯含量测量不确定度评定
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摘要
基于对煤中氯含量测量产生的误差与不确定度进行评定具有重要的意义,针对GB/T3558—2014 《煤中氯的测定方法》中高温燃烧水解—电位滴定法测煤中氯含量结果进行相应的不确定度评定。按照A、B类不确定度来分析与量化,重点对氯含量重复性测量、质量称量、硝酸银标准溶液的浓度及用量、电位测量、氯化钠标准溶液加入量的不确定度进行阐述,提出高温燃烧水解等不确定度对总量不确定度的合成影响不大,经过分析、量化、合成不确定度求得煤中氯含量的扩展不确定度为0.002 2%。
Based on that the evaluation of errors and uncertainties in measurement of chlorine in coal has significant difference,and regarding to results of chlorine determination using high temperature combustion hydrolysis-potentiometric titration method in GB/T 3558—2014 Determination of chlorine in coal,the uncertainty evaluation was done.According to the A,B type uncertainties,the analysis and measurement were done,and aspects such as chlorine content repeatability measurement,weight weighing,concentration and dosage of silver nitrate standard solution,potential measurement and uncertainty of sodium chloride standard solution addition amount were demonstrated,it was proposed that the uncertainty of high temperature combustion hydrolysis did not has big influence on the synthesis of total amount uncertainty,through analysis,quantification and synthesis of uncertainty,it was obtained that the extended uncertainty of chlorine in coal was为0.002 2%.
Based on that the evaluation of errors and uncertainties in measurement of chlorine in coal has significant difference,and regarding to results of chlorine determination using high temperature combustion hydrolysis-potentiometric titration method in GB/T 3558—2014 Determination of chlorine in coal,the uncertainty evaluation was done.According to the A,B type uncertainties,the analysis and measurement were done,and aspects such as chlorine content repeatability measurement,weight weighing,concentration and dosage of silver nitrate standard solution,potential measurement and uncertainty of sodium chloride standard solution addition amount were demonstrated,it was proposed that the uncertainty of high temperature combustion hydrolysis did not has big influence on the synthesis of total amount uncertainty,through analysis,quantification and synthesis of uncertainty,it was obtained that the extended uncertainty of chlorine in coal was为0.002 2%.
引文
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[8]赵琰,魏宁.艾士卡法测定煤中氯含量不确定度评定[J].煤质技术,2015(4):29-33.
[2]马鑫.浅析煤质工业分析仪计量校准方法[J].计量与测试技术,2017(12):116-117.
[3]叶佳宇,苏征,田发亮,等.煤中氟和氯含量的快速测定[J].检验检疫学刊,2017(2):18-22.
[4]VP Ivanov.Rank assignment of coal in terms of its clinkering and coking properties[J].Coke&Chemistry,2016,59(3):74-78.
[5]全国煤炭标准化技术委员会.煤中氯的测定方法:GB/T 3558-2014[S].北京:中国标准出版社,2014:10.
[6]李英华.煤质分析应用技术指南[M].北京:中国标准出版社,2009:133.
[7]史英辉.煤中氯含量测定结果不确定度评定[J].化学分析计量,2004(4):9-12.
[8]赵琰,魏宁.艾士卡法测定煤中氯含量不确定度评定[J].煤质技术,2015(4):29-33.