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在含有0.7—1M盐酸的88％乙醇溶液中,Pb~(2+)与Sn~(4+)的峰电位分开100毫伏,峰高稳定,因此可同时测定。锡的浓度在20微克以下,铅的浓度在30微克以下,峰高与浓度成正比,且都通过零点。锡浓度五倍于铅,或铅浓度五倍与锡均不影响两者的测定。在上述溶液中,Zn~(2+),Ni~(2+),Co~(2+),Mn~(2+),In~(3+),Sb~(3+),Fe~(3+),Ga~(3+)和Ti~(4+)等均不产生波峰,Cd~(2+)虽出峰,但峰高比同浓度铅、锡低,峰电位比锡负150毫伏,不影响测定。铜浓度超过铅的两倍时,需考虑分离。
In 88% ethanol solution containing 0.7-1M hydrochloric acid, the peak potential of Pb 2+ and Sn 4+ is 100 mV apart and the peak height is stable. The concentration of tin is below 20 micrograms and the concentration of lead is below 30 micrograms. The peak height is proportional to the concentration, and both pass the zero point. Five times the tin concentration in lead, or five times the lead concentration and tin does not affect the determination of both. In the above solution, Zn2 +, Ni2 +, Co2 +, Mn2 +, In3 +, Sb3 +, Fe ~ () 3 +), Ga ~ (3+) and Ti ~ (4+) did not produce peaks. Although Cd ~ (2+) peaked, the peak height was lower than that of Pb and Sn Millivolt, does not affect the determination. When the copper concentration exceeds twice the lead, it is necessary to consider the separation.