Study on Determination of Tin in PVC Pipes and Pipe Pieces by Differential Potentiometric Stripping Analysis

ObjectiveTo establish a method of tin in PV Cpipes and pipe pieces.MethodsIn a medium of 0.03mol/L oxalic acid,the pre-electrolysis potential was-1.1V and time was 60s.The stripping peak is about -0.6V.ResultsT in and lead can be separated through selecting subsidiary electrolyte,increasing sensitivity of analysis by adding surface active agent.The method is suitable for deter mination of 0-400μg/L(r=0.996 0-0.999 0)tin.The lowest detecting limit、relative standard deviation and recovery rate of this method is 0.002mol/L、3.49 to 6.30 percent and 91.0 to 98.6 percent.ConclusionThis method is simple and can be applied in the examination of tin in PVC pipes and pipe pieces satisfactorily.