| 环境土壤标准物质的研究与制备 |
| 摘要点击 865 全文点击 672 修订日期：1993-05-02 |
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| 中文关键词 环境土壤标准物质 均匀度 稳定性 精度比较 定值分析 |
| 英文关键词 environmental soils standard referencematerial stability minimal amount of sampling comparison of precision certified values analysis four central values |
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| 中文摘要 |
| 用高铝陶瓷球磨机加工在120℃下烘干30h的风砂土、黑土和暗棕壤土壤样品。用X-射线荧光光谱法等分析样品中Cu、Fe、Ti等元素,做均匀度检验,结果表明样品均匀。定值分析采用NA、ICP-MS等18种不同原理的分析技术。在1年多时间里,用X-射线荧光光谱法做稳定性实验,表明样品稳定。在IBM计算机上处理获取的全部数据。用Grubbs、多重比较S法等剔除离群值,求出最佳估计值。以最佳估计值按定值原则确定标准值。 |
| 英文摘要 |
| he samples of sandy soil, dark soil and dark brown podzolitic soil were collected, dried at 120℃ for 30 hours, and then ground in a high-aluming ceramic ball mill. X-ray fluorecence spectrometry was used to test the homogeneity of Cu,Zn, Fe, Mn, Ti, Sr, V, Zr,etc. A two-level nested variance analysis and coparison, F-test and t-test were carried out. The results showed that the samples were homogeneous.Eighteen different techniques were used for certification, including plasma spectrometry, atomic absorption spectrometry, plasma mass spectrometry,X-ray fluorescence, neutron activation, etc. For each of moot elements, two or more different,reliable analytic methods were adopted. A computer was used to process the data obtained by statistical method. Any group-outliers were rejected by usingGrubbs, T, Dixon, Multi-level comparative S method, average geometric variation-Grubbs test.The best estimated values were obtained by taking the averages of preferred averages of all the data and analytic data as the four central values. The best estimated values thus calculated and complied with the certified values rule are taken as standardvalues. An evaluation of stability of the samples was made by X-ray fluorescence spectrometry during one year period. The results indicated that the storage stability of this standard reference material was satisfactory. |
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