论文部分内容阅读
依来铬蓝黑B是一种金属指示剂,在pH1.95～12.20的Britton-Robinson缓冲溶液中产生一良好的还原波。在氨性缓冲溶液中,当溶液的pH在9.5～11.3时,依来铬蓝黑B也产生一明晰波。该波高与汞柱高的平方根成正比;波高随pH的变化不大;当pH为10.9时,E_(1/2)=-0.45V(相对汞池阳极);E_(1/2)随pH的增加而负移,?E_(1/2)/?pH=-61mV,平均极限电流与滴下时间的对数解析斜率?lg?/?lgt=0.17;经循环伏安法
Chromium Blue Black B is a metal indicator that produces a good reduction wave in a Britton-Robinson buffer at pH 1.95 to 12.20. In ammoniacal buffer solution, when the pH of the solution is 9.5 ~ 11.3, Elacium Blue Black B also produces a clear wave. The wave height is proportional to the square root of high mercury column; the wave height does not change much with pH; E 1/2 (1/2) = -0.45 V (relative to mercury anode); pH value is 10.9; (1/2) /? PH = -61mV, the slope of the logarithm of the average limiting current versus the dropping time was? Lg? /? Lgt = 0.17; and the cyclic voltammetry