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前言目前,邻菲啰啉比色法被推荐为无机化工产品中三氧化二铁测定的通用方法,但尚未应用于磷矿中。磷矿国家标准中采用重铬酸钾法和EDTA容量法。最近,我们把邻菲啰啉法应用于磷矿中三氧化二铁的测定,证实此法比国标中的二种方法优越,重铬酸钾法准确度高,但它需用三氯化钛作为还原剂,而三氯化钛极易氧化,不易保存。EDTA法需要进行分离,手续较繁。邻菲啰啉比色法操作简单、快速、准确度高,若采用低浓度的标准曲线(即取标准系列含铁量在0～100微克范围内)。则可大大降低杂质的干扰。
Foreword At present, the phenanthroline colorimetric method is recommended as a general method for the determination of ferric oxide in inorganic chemical products, but has not been applied to phosphate rock. Phosphorus national standards using potassium dichromate method and EDTA volumetric method. Recently, we applied the phenanthroline method to the determination of ferric oxide in phosphate rock and confirmed that this method is superior to the two methods in the national standard. The potassium dichromate method has high accuracy, but it needs to use titanium trichloride As a reducing agent, and titanium trichloride easily oxidized, not easy to save. EDTA method needs to be separated, the procedure is complicated. Phenanthroline colorimetric method is simple, rapid and accurate. If the standard curve of low concentration is adopted (that is, the standard series iron content is within the range of 0-100 μg). You can greatly reduce the interference of impurities.