原子吸收光谱法测定钌掺杂聚吡咯催化剂中高含量镍

The Determination of High Concentation of Ni in the Catalyst Ru Doped Polypyrrole by AAS

提出了原子吸收光谱法测定钌掺杂聚吡咯催化剂中高含量镍的方法。确定了硝酸高氯酸为混合溶剂，考查了２５种金属离子的干扰情况。镍的最灵敏吸收线波长为２３２．０ｍｍ，用空气乙炔火焰测定高浓度镍时，用波长为３４１．５ｍｍ的次灵敏线，可提高测定精密度，又能使工作曲线的线性范围变宽，镍量在０～１５０μｇｍｌ－１范围内符合比尔定律，此方法测定镍的检测限为０．１４μｇｍｌ－１，其加标回收率在１００．６％～１０３．７％之间，相对标准偏差小于３．１６％。

This paper proposed a new method for the determination of high concentration of Nickel in the cafalyst of Ru doped polymer by AAS, with the mixture of HClO4 and HNO3 as the selvent to resolve the samples, the interference of 25 kinds of metal ions were studied. The most sensitive absorbance Line for Ni is 232.0 mm, but when using air-acetylene the most suitable line for high concentration Ni is 341.5mm, thus this not only eliminate chemistry interference, but also broadens the straight line range of the method. When the concentration of Ni is in 0～150 μgml-1 the Beer' law was obeged. The lowest detection limit is 0.14 μgml-1 for the proposed method. The standard recovery is between 100.6%～103.7%. The relative standard deviation is less than 3.16%. The method can be directly used for the determination of Ni in the above catalyst.