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钢铁中有时硼含量极低(0.0005%以下),原来使用的姜黄素直接光度法,分析下限为0.001%已不够灵敏,因之需要在原有方法的基础上进行萃取比色,以提高灵敏度。后藤秀弘等用甲基异丁基酮-氯仿-酚混合液萃取硼-姜黄素络合物,在预先萃取分离铁基后,可以测定0.0001%硼,但此法试剂空白较高,测微量硼时误差较大,线性也不甚理想.后人认为可用氯仿单独萃取。本法利用原来姜黄素直接显色的条件,在形成硼-姜黄素络合物后,不加缓冲溶液,代以丙酮,同时加入大体积水以降低试液的酸度;丙酮的加入主要系协助硼的萃出:在保温显色后,有时在瓶底有盐类析出,用丙酮清洗瓶子可以加
Sometimes the boron content of steel is very low (0.0005% or less), the original direct use of curcumin spectrophotometric analysis of the lower limit of 0.001% is not sensitive enough, which requires the original method based on the extraction colorimetric to increase the sensitivity. Goto Hidehiro and other methyl isobutyl ketone - chloroform - phenol mixture of boron - curcumin complex extraction, after pre-extraction of iron-based separation, you can determine the 0.0001% boron, but the reagent blank higher, the measured trace Boron when the error is larger, the linear is not very satisfactory. Descendants that chloroform alone can be extracted. This method uses the original direct curcumin conditions, the formation of boron - curcumin complex, without buffer solution, replaced by acetone, while adding a large volume of water to reduce the acidity of the test solution; acetone was added mainly to assist Boron extraction: After the insulation color, sometimes salt precipitation in the bottom of the bottle, acetone can be added to clean the bottle