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在 p H 4.1的乙酸盐缓冲底液中 ,钒能与 5-溴水杨基荧光酮形成络合物 ,并吸附在汞电极上 ,在氯酸盐存在下 ,在 V( )的电极还原过程中形成催化波。用单扫二阶导数极谱法测定时 ,钒浓度在 1 .0× 1 0 -8～ 1 .0× 1 0 -6mol·L-1范围内与峰高成正比关系 ,检出限为 5.0× 1 0 -9mol·L-1。测得电活性络合物的组成为 V( )∶ 5- Br- SAF=1∶ 1。平行催化反应的速率常数 k=1 .9× 1 0 3(mol· L-1) -1· s-1。
Vanadium can form a complex with 5-bromosalicylalkenylfluorone in an acetate buffer bottoms solution of pH4.1 and adsorbed on the mercury electrode in the presence of chlorate at the electrode of V () The formation of a catalytic wave process. The vanadium concentration in the range of 1.0 × 10 -8 ~ 1 .0 × 10 6 mol·L-1 was proportional to the peak height when the single-sweep second derivative polarographic method was used. The detection limit was 5.0 × 10 -9 mol·L -1. The composition of the electroactive complex was measured as V (): 5-Br-SAF = 1: 1. The rate constant of parallel catalysis k = 1.9 × 103 (mol · L -1) -1 · s -1.