铬天青S分光光度法测定贮氢合金中的铝

采用铬天青S分光光度法测定贮氢合金中的铝。最大吸收波长为548nm,表观摩尔吸光系数为5.24×104L/(mol·cm),铝含量在0～0.3μg/ml时有良好的线性关系,绘制标准曲线时加入的镍的含量与样品相近,可消除镍的干扰。本方法简单、快速、准确、精密度高,用于贮氢合金中铝含量的测定,结果满意,RSD1.4%,回收率为98%～102%。

Determine Al in hydrogen storage alloy by chrome azurol S spectrophotometry

Chrome azurol S spectrophotometry was used to determine aluminum(Al)in hydrogen storage alloy.The absorption maxima lay at 548 nm and its apparent molar absorptivity was 5．24×104 L/(mol·cm)．There was a good linear relation within the Al content of 0～0.3 μg/ml.When drawing the standard curve,close amount of nickel(Ni)to the sample was added to eliminate the interference of Ni.The method was simple,rapid,accurate and high precision,the satisfactory resdts was achieved when this method was used to determine the content of Al of hydrogen storage alloys,the BSD was less than 1.4%,the recovery was 98%～102%.