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This paper discussed the determination of hexavalent chromium content in automobile materials and its uncertainty evaluation process based on colorimetric method. Hexavalent chromium in automobile materials was determined by UV spectrophotometry with a pretreatment method of lye digestion, and the uncertainty of measurement results was evaluated. A mathematical model is established to analyze and discuss the source of uncertainty measurement, calculation and result representation. The results show that the preparation process of standard solutions, measurement repeatability and calibration curve fitting quantification are the main contributors to the uncertainty of measurement results, which should be paid attention to in the testing process.
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探究基于比色法的汽车材料六价铬含量测定及其不确定度评定过程。试验中前处理方法为碱液消解法,测定汽车材料中的六价铬含量方法为紫外分光光度法,并对测量结果的不确定度进行评定。建立相关数学模型对该测试工作的测量不确定度来源、计算和结果表示等问题进行分析讨论。结果表明,测量结果不确定度的主要贡献者为标准溶液配置过程、测量重复性以及校准曲线拟合定量,测试过程中应予以关注。
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胡曼(1987—),女,高级工程师,硕士学位,研究方向为汽车材料及汽车环保性能。
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化学分析中不确定度的评估指南: CNAS-GL06[S]. 北京: 中国计量出版社,
2006: 13-21., articleTitle=null, refAbstract=null), Reference(id=1217498893605060707, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1217470734163689801, doi=null, pmid=null, pmcid=null, year=2012, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[6], rfOrder=5, authorNames=全国法制计量管理计量技术委员会, journalName=测量不确定度评定与表示: JJF 1059.1—2012, refType=null, unstructuredReference=全国法制计量管理计量技术委员会.
测量不确定度评定与表示: JJF 1059.1—2012[S]. 北京: 中国计量出版社,
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常用玻璃量器检定规程: JJG 196—2006[S]. 北京: 中国计量出版社,
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| 标准溶液浓度/mg·L-1 | 体积校准的相对标准不确定度/% |
| 0.5 | ur1(V) | 0.29 |
| 0.4 | ur3(V) | 0.29 |
| 0.3 | ur4(V) | 0.29 |
| 0.2 | ur5(V) | 0.29 |
| 0.1 | ur6(V) | 0.29 |
| 0 | ur7(V) | 0.02 |
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系列标准溶液浓度体积校准的相对标准不确定度
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| 标准溶液浓度/mg·L-1 | 体积校准的相对标准不确定度/% |
| 0.5 | ur1(V) | 0.29 |
| 0.4 | ur3(V) | 0.29 |
| 0.3 | ur4(V) | 0.29 |
| 0.2 | ur5(V) | 0.29 |
| 0.1 | ur6(V) | 0.29 |
| 0 | ur7(V) | 0.02 |
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质量浓度/ mg·L-1 | 吸光度/A |
| 第1次 | 第2次 | bxij+a |
| 0.0 | 0.000 0 | 0.0000 | -0.000 3 |
| 0.1 | 0.079 1 | 0.079 1 | 0.077 9 |
| 0.2 | 0.159 6 | 0.159 6 | 0.156 2 |
| 0.3 | 0.228 9 | 0.228 9 | 0.234 4 |
| 0.4 | 0.3075 | 0.307 5 | 0.312 7 |
| 0.5 | 0.396 8 | 0.396 8 | 0.390 9 |
| A=0.782 4x-0.000 3 R2=0.999 |
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六价铬浓度与吸光度对应表
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质量浓度/ mg·L-1 | 吸光度/A |
| 第1次 | 第2次 | bxij+a |
| 0.0 | 0.000 0 | 0.0000 | -0.000 3 |
| 0.1 | 0.079 1 | 0.079 1 | 0.077 9 |
| 0.2 | 0.159 6 | 0.159 6 | 0.156 2 |
| 0.3 | 0.228 9 | 0.228 9 | 0.234 4 |
| 0.4 | 0.3075 | 0.307 5 | 0.312 7 |
| 0.5 | 0.396 8 | 0.396 8 | 0.390 9 |
| A=0.782 4x-0.000 3 R2=0.999 |
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| 序号 | 测试结果/mg·kg-1 |
| 1 | 7.2 |
| 2 | 7.6 |
| 3 | 7.2 |
| 4 | 7.4 |
| 5 | 7.3 |
| 6 | 7.8 |
| x0(均值) | 7.4 |
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样品中六价铬含量测定结果
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| 序号 | 测试结果/mg·kg-1 |
| 1 | 7.2 |
| 2 | 7.6 |
| 3 | 7.2 |
| 4 | 7.4 |
| 5 | 7.3 |
| 6 | 7.8 |
| x0(均值) | 7.4 |
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| 序号 | 不确定度分量 | 不确定度 符号表示 | 不确定度 计算结果/% |
| 1 | 样品称量引入的 相对标准不确定度 | | 0.003 3 |
| 2 | 消解液定容引入的 相对标准不确定度 | | 0.055 0 |
| 3 | 样品溶液浓度测定引入的 相对标准不确定度 | | 1.970 0 |
| 4 | 样品重复性测量引入的相对标准不确定度 | | 2.290 0 |
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计算所得各不确定度分量
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| 序号 | 不确定度分量 | 不确定度 符号表示 | 不确定度 计算结果/% |
| 1 | 样品称量引入的 相对标准不确定度 | | 0.003 3 |
| 2 | 消解液定容引入的 相对标准不确定度 | | 0.055 0 |
| 3 | 样品溶液浓度测定引入的 相对标准不确定度 | | 1.970 0 |
| 4 | 样品重复性测量引入的相对标准不确定度 | | 2.290 0 |
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