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球墨铸铁中镁的测定,我们曾用过铬黑T光度法,铬变酸2R光度法,该法都需要用铜试剂分离干扰元素,且曲线容易变动,重现性差.本文试验了偶氮氯膦-1光度法测定镁,投产两年来普遍反映操作简便、容易掌握、重现性好,曲线稳定.一、试剂与仪器硝硫混合酸:每升含8毫升硝酸,50毫升硫酸;缓冲溶液(pH10.5):50克硼砂,10克氢氧化钠溶于水中稀释至1升;
The determination of magnesium in ductile iron, we have used chromium black T luminosity method, chromogenic acid 2R photometric method, which requires the use of copper reagent separation of interfering elements, and the curve is easy to change, poor reproducibility.This paper tested azo chlorine Phosphine-1 spectrophotometric determination of magnesium, put into operation two years generally reflect the simple, easy to grasp, reproducible, stable curve. A reagent and equipment Nitric acid mixed acid: containing 8 ml of nitric acid per liter, 50 ml of sulfuric acid; buffer solution (pH 10.5): 50 g borax, 10 g sodium hydroxide dissolved in water and diluted to 1 liter;