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研究 Rh( )对 Lu- H2 O2 - Cu( )化学发光体系的抑制作用 ,提出在贵金属混合物中测定微量 Rh( )的新方法 :在 p H=1 2 .40～ 1 2 .6 0的碱性溶液中 ,微量 Rh( )可抑制 ( 2 .5～ 7.5)× 1 0 -3 mol/ L Lu- ( 1～ 4)× 1 0 -2 mol/ L H2 O2 - Cu( ) (与待测 Rh在同一数量级 )体系的化学发光 ,线性范围 0 .1～ 1 0μg/ m L Rh( ) ,相对标准偏差 2 % ,检出限 0 .0 4 μg/ m L Rh( ) ,已用于 7种贵金属人工混合试液和 Pt- Rh合金中 Rh的测定 .
A new method for the determination of trace amount of Rh () in a noble metal mixture was proposed based on the inhibition of Rh () on the chemiluminescence system of Lu - H 2 O 2 - Cu () (2 .5 ~ 7.5) × 10 -3 mol / L Lu- (1 ~ 4) × 10 -2 mol / L H 2 O 2 - Cu Rh in the same order of magnitude) system with a linear range of 0.1-1 0 μg / m L Rh () with a relative standard deviation of 2% and a detection limit of 0. 04 μg / m L Rh () for 7 Determination of Rh in Artificial Mixed Test Solution and Pt-Rh Alloy.