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比色法测定硅,将硅钼黄还原成硅钼蓝,常用的还原剂有硫酸亚铁铵、氯化亚锡、抗坏血酸和1-氨基2-荼酚4-磺酸等。这些试剂各有优劣,共同的缺点是稳定性差,保存时间短,分析大批量试样时配制试剂很不方便。本文提供了一种比较理想的混合还原剂。其优点是还原速度快,化学稳定性好,可以长时间保存。一,混合还原剂的配制方法取4000mL蒸馏水于5000mL试剂瓶中,缓慢加入150mL浓硫酸(分析纯,以下试剂均为分析纯),边加边搅拌。待溶液冷却至室温后,依次加入50g硫酸亚铁铵,5g乙二胺四乙酸二钠盐和10g抗坏血酸
Colorimetric determination of silicon, silicon molybdenum yellow reduced to silicon molybdenum blue, commonly used reductants ammonium ferrous sulfate, stannous chloride, ascorbic acid and 1-amino-2-catechol 4-sulfonic acid. The advantages and disadvantages of each of these reagents, the common drawback is poor stability, short storage time, the preparation of reagents when analyzing large quantities of the sample is not convenient. This article provides an ideal mixture of reducing agents. The advantage is the reduction speed, good chemical stability, you can save for a long time. First, the mixed reductant preparation method Take 4000mL distilled water in 5000mL reagent bottle, slowly add 150mL of concentrated sulfuric acid (analytical grade, the following reagents were of analytical grade), while stirring. After the solution was cooled to room temperature, 50g of ammonium ferrous sulfate, 5g of ethylenediaminetetraacetic acid disodium salt and 10g of ascorbic acid