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| 挥发性有机污染物标准物质使用的短期稳定性评价 | |
| 引用本文： | 刘玉龙,夏凡,张洪志.挥发性有机污染物标准物质使用的短期稳定性评价[J].岩矿测试,2012,31(4):647-652. |
| 作者姓名： | 刘玉龙 夏凡 张洪志 |
| 作者单位： | 1. 中国石油集团安全环保技术研究院,北京100083;中国地质大学(北京)水资源与环境工程北京市重点实验室,北京100083 2. 长江流域水环境监测中心,湖北武汉,430010 3. 黑龙江省水文地质工程地质勘察院,黑龙江哈尔滨,150030 |
| 基金项目： | 中国地质大调查项目(1212011016009); 水体污染控制与治理科技重大专项(2009ZX07420-008-02) |
| 摘 要： | 为对挥发性有机物标准物质的短期稳定性进行评价,选取美国ChemService公司生产的LVOC-1RPM(甲醇中54种挥发性有机污染物混合标准物质)和SS-524RPM(甲醇中4-溴氟苯和1,2-二氯苯-d4混合标准物质),将其开封后转移至2 mL带聚四氟乙烯衬盖的棕色螺口样品瓶中再密封,于-18℃避光贮存,采用气相色谱-质谱法测试各组分量值随贮存时间的变化。结果表明,在65 d内,两种标准物质各组分量值测量的标准偏差在12～60 mg/L范围内,最大相对标准偏差为2.97%(n=5),测量结果的相对不确定度小于5.39%。在置信度为95%时,χ2-检验和不确定度评定结果表明,评价方法满足标准物质稳定性检验的精密度和准确度要求;标准物质各组分量值在(2000±128)mg/L范围内时,测量的偏差不显著。在不超过标准物质的有效期内,开封后再密封的LVOC-1RPM标准物质至多可保存65 d,而SS-524RPM标准物质至少可保存65 d。 |
| 关 键 词： | 挥发性有机物 标准物质 保存时限 短期稳定性 |
| 收稿时间： | 2012/1/28 0:00:00 |
The Evaluation of Short-term Stability of Opened Stocks of Certified Reference Materials in the Analysis of Volatile Organic Compounds |
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| LIU Yu-long,XIA Fan and ZHANG Hong-zhi.The Evaluation of Short-term Stability of Opened Stocks of Certified Reference Materials in the Analysis of Volatile Organic Compounds[J].Rock and Mineral Analysis,2012,31(4):647-652. | |
| Authors: | LIU Yu-long XIA Fan and ZHANG Hong-zhi |
| Institution: | Research Institute of Safety and Environment Technology, China National Petroleum Corporation, Beijing 100083, China;Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences (Beijing), Beijing 100083, China;Yangtze Valley Water Environment Monitoring Center, Wuhan 430010, China;Hydrogeology and Engineering Geology Prospecting Institute of Heilongjiang Province, Harbin 150030, China |
| Abstract: | In order to evaluate short-term stability of opened stocks of certified reference materials(CRMs) in the analysis of volatile organic compounds(VOCs),CRMs LVOC-1RPM and SS-524RPM(including 54 VOCs and 2 surrogates in methanol,respectively,manufactured by ChemService Inc.,USA) the stocks were transferred into 2 mL brown bottles equipped with Teflon-lined screw-caps,stored at-18℃ and protected from light.The variation of the CRMs’ compounds with storage time was tested by Gas Chromatography-Mass Spectrometry(GC-MS).The results showed that the standard deviations of all the compounds of the 2 CRMs ranged from 12-60 mg/L,the maximum relative standard deviation is 2.97%(n=5) and the maximum relative uncertainty is below 5.39%.In the 95% confidence interval,the chi-squared test(χ2-test) and uncertainty estimation show that precision and accuracy of the measurements is acceptable.In addition,the measurement deviation is not significant when the range of compounds of the CRMs are within(2000±128) mg/L.The experimental data also shows that the preservation period of the opened stocks of LVOC-1RPM CRMs is not more than 65 days and that of the opened stocks of SS-524RPM CRMs is not less than 65 days within the period of validity of the CRMs. |
| Keywords: | volatile organic compounds (VOCs) certified reference material (CRMs) storage duration short-term stability |
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