供应美国NIST可追溯铁金属标准物质SRM 937

供应美国NIST可追溯铁金属标准物质SRM 937

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This Standard Reference Material (SRM) is a material of known purity intended for use as an assay standard for iron.SRM 937 consists of electrolytic grade iron to be used primarily for the calibration of instrumentation and standardization of procedures and for the routine evaluation of daily working standards used in these procedures. A unit of SRM 937 consists of 50 g of iron metal in the form of chips sized between 0.5 mm and 1.8 mm mesh. 美国NIST可追溯

The certified value shown is based on dissolution of representative samples in hydrochloric acid followed by reduction of the iron with stannous chloride and oxidation of the excess stannous chloride with mercuric chloride. Most of the iron was oxidized with a known mass of potassium dichromate and the remaining iron was titrated with potassium dichromate solution. The estimated uncertainty shown is based on judgement and includes allowances for known sources of possible error. 可追溯铁金属标准物质

Chemical analyses made on representative samples showed the presence of the following elements at the indicated mass fraction (expressed as %): nickel, 0.041 %; silicon, 0.008 %; carbon, chromium, and cobalt, each 0.007 %;copper, manganese, oxygen, and sulfur, each 0.006 %; molybdenum, 0.005 %; phosphorus, 0.003 %; germanium and nitrogen, each 0.001 %; total of all other elements, < 0.003 %.

The iron mass fraction (expressed as %), by difference, is 99.89 + %. This is in agreement with the certified value

本标准参考物质（SRM）是一种已知纯度的材料，旨在用作铁的分析标准。SRM 937由电解级铁组成，主要用于仪器校准和程序标准化，以及对这些程序中使用的日常工作标准进行常规评估。SRM 937的一个单元由50克铁金属组成，其为尺寸在0.5毫米至1.8毫米筛网之间的碎屑形式。

所示的认证值是基于代表性样品在盐酸中的溶解，然后用氯化亚锡还原铁，并用氯化汞氧化过量的氯化亚锡。大部分铁用已知质量的重铬酸钾氧化，剩余的铁用重铬酸钾溶液滴定。所示的估计不确定性是基于判断的，包括已知可能误差源的裕度。

对代表性样品进行的化学分析显示，在指示的质量分数（以%表示）下，存在以下元素：镍，0.041%；硅，0.008%；碳、铬和钴，每种含量为0.007%；铜、锰、氧和硫，每种含量为0.006%；钼，0.005%；磷，0.003%；锗和氮，各自为0.001%；所有其他元素的总和，<0.003%。

铁的质量分数（以%表示），按差值计算，为99.89+%。这与认证值一致

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