TEKNIK VOLTAMETRI PELUCUTAN ANODIK GELOMBANG PERSEGI UNTUK PENENTUAN KADAR LOGAM Cu DALAM KANGKUNG AIR

Heavy metal analysis of Cu (II) was measured by square wave anodic stripping voltammetry method.The aim of this research is to know the validity of square wave anodic stripping voltammetry method for determination of Cu (II) in water spinach from the estuary of Badung river.Glassy carbon, Ag/AgCl, and Pt wire electrodes were used as working electrode, reference electrode and counter electrode, respectively. Optimized parameter involved the deposition time and scan rate in standard solution Cu (II) 500 ppb. Furthermore, the validation method was examined by determination of linear concentration range, limit of detection, repetition of measurement, and percent of recovery. Moreover, the result of validation was used for observing of heavy metal Cu (II) content in water spinach. The result of optimum deposition time is 60 s. Meanwhile, the scan rate optimum is10 mV/s. Measurement for standard solution 50 – 500 ppb on linear concentration range, with correlation coefficient 0,9983. Limit of detection is 35 ppb, repetition of measurement for metal has Horwitz ratio less than 2, and percent recovery of Cu (II) measurement is 99,35% ± 0,45. The measurement of Cu (II) content in the water spinach sample contain Cu(II) 4,0 ppm (accepted value).