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当微量Ag~1、Hg~(2+)(10~(-7)M～10~(-9)M)共存于溶液(用HCl调pH为2的0.1MKSCN)中时,用普通极谱仪在-1.5V(VS、Ag/AgCl、盐桥联接),电解沉积2～10分钟,-0.3V～+0.2V溶出,在+0.12V出现一个很好的Ag-Hg金属间化合物溶出峰,它比Ag~+或Hg~(2+)单独存在时的溶出峰灵敏得多,并与两者的峰高、峰形、峰电位都有显著不同。当Hg~(2+)浓度一定时、峰高与Ag~+浓度呈正比,反之亦然。用标准加入外推法外延工作曲线至横轴,便能直接读出被测液中Ag~+浓度。
When trace amounts of Ag ~ 1, Hg ~ (2 +) (10 ~ (-7) M ~ 10 ~ (-9) M) coexist in the solution (0.1MKSCN adjusted to pH 2 with HCl) The instrument was eluted at -0.5 V (VS, Ag / AgCl, salt bridge), electrolytically deposited for 2 to 10 minutes, and eluted at -0.3 V to +0.2 V with a good Ag-Hg intermetallic compound eluted peak at +0.12 V , Which is much more sensitive than the dissolution peak when Ag + or Hg 2+ exists alone, and has significant difference with the peak height, peak shape and peak potential. When the concentration of Hg ~ (2+) is constant, the peak height is proportional to the Ag ~ + concentration and vice versa. With the standard addition of extrapolation extension of the working curve to the horizontal axis, you can directly read out the measured Ag ~ + concentration.