【摘要】 在pH5.80～6.70溶液中,紫外光照射下,二苯基碳酰二肼与Ag+作用生成红色的二苯卡巴腙,产物用三氯甲烷萃取后,于557nm波长处有一最大吸收值,Ag+浓度在0～1.12×10-3mol/L时符合比尔定律,据此建立了测定微量Ag+的分光光度法。当测定溶液中1.0×10-3mol/LAg+时,大量Al3+,Fe3+,Fe2+,K+,Na+,Ca2+,Co2+,Ni2+,Mn2+,Cu2+,Zn2+,V(Ⅴ),Ti(Ⅳ),SO42-没有干扰;Cr(Ⅵ)使实验结果偏高,测定前需予先除去。用本法测定显影液中Ag+,相对标准偏差为2.65%,加标回收率为103.6%。更多还原

【Abstract】 In the solution at pH5.80-6.70 and under the illumination of UV radiation,diphenylcarbazide can react with Ag+ to produce a red diphenylcarbazone,of which absorption maximum lies at 557nm when diphenylcarbazone is extracted into thrichloromethane.Beer’s law is obeyed in the concentration range of 0-1.12×10-3mol/L for Ag+.In view of the above,a spectrophotometry for the determination of Ag+ is founded.Larger quantities of Al3+,Fe3+,Fe2+,K+,Na+,Ca2+,Co2+,Ni2+,Mn2+,Cu2+,Zn2+,V(Ⅴ),Ti(Ⅳ)and SO2-4 do not interfere in the delermination.However,the presence of Cr(Ⅵ)enhances the determination results,so it is necessary to remove before the determination.This method is employed to the determination of Ag+ in developing waste liquor with the relative standard deviation of 2.65% and the recovery of 103.6%.更多还原