铁是人体必需的元素,具有重要的生理功能。除血红蛋白、肌红蛋白中含有多量铁外,血浆中亦含有微量铁,测定血浆铁含量有助于贫血的诊断,但因其含量甚微,在测定上存在一定困难,以往所用血清铁测定法都存在着灵敏度差、用血量大、操作复杂等问题。近年来虽有原子吸收法、离子选择电极法等,但又不适于临床常规应用,因此很需要一种灵敏、特 Iron is an essential element of the human body and has important physiological functions. In addition to hemoglobin, myoglobin contains large amounts of iron, the plasma also contains traces of iron, determination of plasma iron content is conducive to the diagnosis of anemia, but because of its content is very small, there are some difficulties in the determination of serum iron assay There are problems such as poor sensitivity, large amount of blood, complicated operation and so on. Although in recent years, atomic absorption method, ion-selective electrode method, but not suitable for clinical routine applications, it is necessary for a sensitive, special