共查询到17条相似文献,搜索用时 171 毫秒
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对便携式余氯分析仪提出了计量性能要求及校准方法,并验证了方法的可行性,对计量检定机构开展校准工作及今后规程的制定有一定的指导意义. 相似文献
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对JJG 1002-2005旋转黏度计计量检定规程存在的问题进行探讨,指出该规程不适合血液黏度计的检定,应重新制订血液黏度计计量检定规程或计量校准规范,以适应医学临床需要. 相似文献
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JJG 395–1997《定碳定硫分析仪检定规程》中的部分技术要求和检定项目已不能满足现代碳硫分析仪器检定/校准的要求。对规程的适用性、称量稳定性、示值误差、标准物质、重复性、分析时间等进行了探讨,并给出了修订建议。探讨了评定仪器检测空白的可能性,提出了依据碳硫测定基准国标方法的仪器检定/校准方法,以评定不同用途的测试仪器,并扩展了仪器检定/校准的范围。为计量部门修订规程提供参考,同时也为实验室合理评价,验收碳硫分析仪,及时掌握仪器的运行状况,保证分析数据的准确性、一致性和溯源性提供借鉴。 相似文献
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《化学分析计量》2015,(6)
对冶金分析仪器检定/校准中若干问题进行了探讨,包括计量标准、示值误差异常值的判断、不确定度、检定/校准项目、元素和测量范围等。计量人员用标准物质检定/校准仪器可以保证仪器测量结果的溯源,而实验室"自检定/自校准"不具备溯源性;示值误差的测量次数和测量数据的一致性需要利用统计规则进行判断,而不能直接取平均值作为测量结果;进行检定/校准结果的不确定度评定时,重复性引入的不确定度分量可以预先评估,评定检出限不确定度意义不大,实验室在进行一次测量时,一定程度上可以直接引用校准证书上的不确定度。校准的项目、元素和范围超出检定规程或者校准规范的要求时,计量机构需要进行方法确认及不确定度的评定。 相似文献
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根据JJF1059-1999《测量不确定度评定与表示》,JJG376-1985《电导仪试行检定规程》,经过测量不确定度分析。探讨了在进行电计与电导池配套检定时,由不同级别的国家电导率指标物质及配套设备组成的检定装置所适合检定的电导率仪,以及检定装置的最佳配置。 相似文献
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能量色散X荧光光谱仪至今还没有形成统一的国家检定规程.因此,根据仪器的实际检定要求,参考相关仪器的检定规程,对能量色散X荧光光谱仪的检定方法进行了深入的研究和探讨,提出了能量色散X射线荧光光谱仪的检定方法. 相似文献
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通过大量的试验数据确认,玻璃量器的检定与校准有显著区别,混淆两者会严重影响容量分析中的测量量值。为了确保玻璃量器量值传递的准确一致,作者提出了四条切实可行的技术途径。实践证明,化学分析用玻璃量器校准规程能在化学计量领域中对量值传递的准确一致起到重要作用。 相似文献
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为进一步增强气相色谱仪检定规程的合理性,对JJG 700-1999规程的适用性进行了分析,明确了规程修订的目的和意义,并对需要修改的项目及内容进行了研讨. 相似文献
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The conditions for the hydrodynamic regulation of pH in disperse systems, which influence the surface charge of disperse particles, as well as the solubility of salts of heavy metals and their electrostatic adsorption and electromigration mobility are theoretically substantiated. Experimental verification of the developed theoretical model performed based on the example of a kaolinite dispersion confirmed the validity of the employed theoretical assumptions. The developed method makes it possible to remove cadmium ions almost completely over 24 h, which is, in principle, impossible without pH regulation even after a long-term treatment. 相似文献
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对RoHS检测用X荧光光谱仪提出了计量性能要求及校准方法,并验证了方法的可行性,为今后规程的制定提供参考。 相似文献
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Abstract The photoallergens bithionol (BT) and fentichlor (FT) generated free radical photoproducts upon UV photolysis which were observable by direct electron spin resonance (ESR). Both the yield and the type of free radical photoproducts were affected by pH, and to some extent, concentration of oxygen and concentrations of the photosensitizers. At pH 8.5, bithionol (0.9 mM) generated a semiquinone type free radical (BI) via a mechanism which probably involves substitution of the 4-chlorine by hydroxyl to form the corresponding hydroquinone followed by oxidation. The photolysis of 4-chlorophenol, 4-chlorocatechol and 2,2'-methylene-bis(4-chlorophenol) also generated the corresponding semiquinone radicals, suggesting that this mechanism is shared by other 4-chlorophenols. At pH 8.5, only photoproduct BI was observed during the irradiation of BT; FT related photoproducts were not observed at this pH. However, at higher pH values (pH 10.7 or pH 12), FT photoproducts were also observed in addition to BI upon prolonged irradiation. Moreover, the yield of BI increased drastically at higher pH. Oxygen did not play any role at pH 10.7, although it enhanced the yield of BI at pH 8.5. At pH 8.5, irradiated fentichlor generated, in roughly equal amounts, a semiquinone radical (Fla) and an unidentified species which contained two inequivalent protons (FII). At higher pH values (pH 10.7 and pH 12), at least four species were observed. All of the species are believed to be semiquinone radicals and two have been unambiguously identified. The yield of FI increased by a factor of 50 as the pH was increased from 8.5 to 12. Oxygen played only a minor role at pH 10.7 and above. However, at pH 8.5, it also enhanced the yield of FI. 相似文献