硅铁中铝的测定,一般采用EDTA容量法,但操作手续冗长,且因铝含量不高(2％左右)往往不能得到满意的分析结果。 CAS比色法测定钢铁中的铝早有报导,而用来测定硅铁中铝的资利甚少(我们尚未见报导)。鉴于硅铁中除铁量较高外,其它杂质含量均较低,故采用Zn—EDTA掩蔽铁等杂质,CAS显色直接比色测定硅铁中铝是比较理想的,为此,我们着重对试样的分解及酸度的控制等进 Ferrosilicon aluminum determination, the general use of EDTA volumetric method, but the lengthy operating procedures, and because the aluminum content is not high (about 2%) often can not get satisfactory results. CAS colorimetric determination of aluminum in steel has long been reported, and used to determine the ferrosilicon in ferroalloy little (we have not yet reported). In view of high iron content in ferrosilicon, other impurities are low, so the use of Zn-EDTA to mask impurities such as iron, CAS chromogenic direct colorimetric determination of ferrosilicon is ideal, therefore, we focus on Decomposition of the sample and the control of acidity into