标准加入原子吸收光谱法测定造币液中微量铁

用标准加入火焰原子吸收法测定造币液中微量铁,极高含量的镍的化学干扰的影响被消除,利用塞曼效应扣背景,镍等基体的背景影响亦被扣除。镍量在50g/L以下时,11mg/L以下铁的标准曲线具有良好的线性,且都经过坐标原点。方法检出限(3S)为0.14mg/L,最大加标量为6mg/L时,测定范围为0.28-5mg/L。样品分析的加标曲线的相关系数为0.99956～0.99994,相对标准偏差为0.94～2.23％,方法准确可靠。

Standard Addition-Flame Atomic Absorption Spectrometry forDetermination of Iron in Plating Solution of Making Coin

A standard addition method for the determination of iron in plating solution of making coin by flame atomic absorption spectrometry is reported. Chemical interference of more large amounts of nickel is eliminated. And the background interfere of nickel and other ions is completely deducted with Zeemen effect. The linearity of standard curve of tron(0-11mg/L) in the presence of below 50g/L nickel is very good. And the curve passes the central point coordinate. The limit of detection (3s) is 0. 14mg/L. And determination range is 0 . 2 8 - 5 mg / L for the largestamount of standard addition is 6 mg / L . The interrelation coefficient of adding standard curve is 0. 99956-0. 99994 and the relative standard deviation is 0. 94-2. 23% for samples analysis. This method is accurate and reliable.