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邻菲绕啉光度法测定低含量铁是成熟方法,我们在此法基础上运用于全差示光度法测定高含量铁,取得与重铬酸钾容量法相当的精密度,可消除汞、铬的危害。在拟定条件下,毫克量的常见元素不干扰;铜允许量虽少,但控制pH1.7显色可允许高达5毫克。显色试剂采取混合加入以简化操作。方法快速、准确、经济,适用于多种试样中低或高含量铁的测定。仪器和试剂配制771型双光路全差示比色计(浙江新安江分析仪器厂),440nm滤光片。混酸—磷酸:
Phenanthroline spectrophotometric determination of low levels of iron is a mature method, we use this method based on the full differential spectrophotometric determination of high levels of iron, obtained with potassium dichromate volumetric method of precision, to eliminate mercury, chromium The harm. Under the proposed conditions, milligram quantities of the common elements do not interfere; the amount of copper allowed is small, but the control of pH1.7 color development may allow up to 5 mg. Color reagents are mixed to simplify handling. The method is rapid, accurate and economical and is suitable for the determination of low or high iron in a variety of samples. Instruments and reagents Preparation 771 dual optical full colorimeter (Zhejiang Xinanjiang Analytical Instrument Factory), 440nm filter. Mixed acid - phosphoric acid: