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建立了高频红外碳硫分析仪测定硅锰合金中碳含量的相应数学模型,对数学模型中各个参数进行不确定度来源分析,分别对A类不确定度或B类不确定度进行评定。对各不确定度分量合成和扩展,得到碳质量分数的不确定度。结果表明:曲线的拟合是不确定度的主要来源。 相似文献
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曾杰 《中国石油和化工标准与质量》2018,(10)
文章应用红外碳硫分析仪,在选定的硅锰标样下建立了硅锰合金中测定硫量的方法。对硅锰合金试样分析条件、试样量、助熔剂的选择和配比进行了探讨,确定了最佳的分析条件,且进行了准确度和精密度实验,取得了满意结果,操作简单,方便公司日常工作。 相似文献
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对氟硅酸钾容量法测定硅锰合金中硅的条件进行研究,建立一种测定硅锰合金中硅含量的简单方法。通过氢氧化钾熔融分解,在硝酸介质中,沉淀硅酸根离子,经过过滤,洗涤,中和残余酸,水解,用氢氧化钠标准溶液滴定生成的氢氟酸,计算出硅的含量。方法应用于硅锰合金标准物质中硅的测定,测定值与标准值一致。对样品进行精密度试验,三种硅锰合金标准物质中硅含量测定结果的标准偏差(RSD)均不大于0. 6%(n=8)。 相似文献
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对过硫酸铵分光光度法测定合成水中锰过程中产生的不确定度进行评估。应用检测不确定度评定方法对测量结果进行不确定度分析与评定。该方法测定水中锰的扩展不确定度为Uc=0.0734mg/L。为提高测定结果的准确性,减小不确定度,建议在检测过程中采取一些技术改进措施。 相似文献
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利用电位滴定法测定镍钴锰酸锂(LiNixCoyMn1-x-yO2)中锰含量,分析测量不确定度来源,对主要不确定度分量进行了合理的评定,包括重复测定的不确定度,称量引入的不确定度,金属锰纯度引入的不确定度,锰摩尔质量的不确定度以及体积产生的不确定度。通过对各相对标准不确定度分量的计算,求出合成标准不确定度(Ue)和扩展不确定度(U)。结果表明,影响合成标准不确定度的主要因素是体积和测定的重复性。 相似文献
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探讨用分光光度法联合测定普碳钢及低合金钢中硅、锰、磷的含量。实验表明,该方法操作简便、快速、准确度高,重现性好。 相似文献
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M. Yano S. Fujitani K. Nishio Y. Akai M. Kurimura 《Journal of Applied Electrochemistry》1998,28(11):1221-1225
The amount and distribution of additive species in zinc alloy particles containing 0.025wt% bismuth modified with 0.10wt% indium for mercury-free alkaline manganese batteries were examined after storage at various discharging levels at 60°C. The amount of hydrogen gas evolution due to the self-discharging reactions of zinc and the internal cell impedance were also evaluated. The amount of additive species in the zinc alloy particles was found to increase with increasing depth of discharge. Indium was homogeneously distributed on the surface even after partial discharge and also after storage for 1200h at 60°C. This behaviour is considered to contribute to the suppression of hydrogen gas evolution and increase in the internal cell impedance to the same level as when mercury is employed. As a result, mercury-free alkaline manganese batteries showed the same storage characteristics as conventional batteries containing mercury. 相似文献
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本文建立了高锰酸钾电位滴定法测定铜镍锰钎料中锰的方法,研究了测定锰的条件。结果表明:在焦磷酸钠介质中,采用Pt指示电极和Ag参比电极指示滴定终点,用高锰酸钾溶液滴定Mn(Ⅱ)为Mn(Ⅲ),测定约30%锰含量,相对误差小于±0.14%,标准加入回收率在99.60%~100.50%之间。方法准确度高,重现性和选择性好,操作简便,重点敏锐,结果令人满意。 相似文献
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T. I. Litvinova T. F. Raichenko V. P. Pirozhkova 《Refractories and Industrial Ceramics》1969,10(3-4):250-253
Conclusions Metallic iron has a comparatively weak effect on the periclase constituent of a magnesite crucible. The new structures formed (magnesiowustite and magnesioferrite) develop from the periclase grains, which does not lead to breakdown of the refractory. The crucible fails as a result of the interaction between the iron oxides and the silica-containing constituent and of migration of the low-melting products of this interaction from the reaction zone.Metallic manganese modifies the structure of a magnesite crucible to a substantially greater extent, since it promotes formation of low-melting manganese- and magnesium-containing silicate phases such as monticellite, tephroite, etc.As a result of its high chemical activity, crystalline silicon has the most destructive effect on the structure of a magnesite crucible, apparently causing silicothermal reduction of the magnesium oxide and formation of metallic magnesium, some of the latter going into the vapor phase and being removed from the reaction zone of the crucible.The fact that iron and manganese are oxidized principally by atmospheric oxygen in the crucible pores, while silicon is oxidized mainly by oxygen from magnesium oxide, is of great practical interest, since silicon therefore breaks down a magnesite crucible very rapidly.Translated from Ogneupory, No.4, pp. 52–56, April, 1969. 相似文献
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周菊华 《化学工业与工程技术》2003,24(4):51-52
通过一次性称样、熔样,分别采用分光光度法测定普通钢中硅、锰、磷、镍、铬、铜的含量。实验表明,该法操作简单、快速、准确,试剂易得。 相似文献