DETERMINATION OF LEAD IN WASTE WATER USING CYCLIC VOLTAMMETRY BY PLATINUM WIRE ELECTRODE

Abstract

ABSTRAK Telah dilakukan penentuan Pb pada air limbah menggunakan metode siklik voltammetri dengan elektroda batang Pt. Metode siklik voltammetri dilakukan dengan tiga elektroda yaitu elektroda batang Pt sebagai elektroda kerja, elektroda lempeng Pt sebagai elektroda pembanding dan Ag/AgCl (KCl jenuh) sebagai elektroda rujukan. Instrumen yang digunakan yaitu PGSTAT 100 N 100 V/250 mA type (Metrohm Autolab). Elektroanalisis dilakukan dalam larutan elektrolit 0.1 M KCl. Hasil penelitian menunjukkan bahwa analisis Pb dengan metode siklik voltammetri menghasilkan parameter analisis seperti koefisien korelasi R 2 = 0.999, LOD = 0.9029 mg/L, LOQ = 3.0098 mg/L dan recovery = 100,67%. Metode ini sangat sesuai untuk analisis Pb karena mempunyai parameter analisis yang sangat baik, selain itu metode ini sangat sederhana dan sedikit penggunaan bahan kimia. Kata-kata kunci: Pb, air limbah, siklik voltammetri, batang platinum. ABSTRACT Determination of lead in waste water using cyclic voltammetry by platinum wire electrode has been carried out. The cyclic voltammetry method was performed in a three electrodes system using platinum wire as a working electrode, an Ag/AgCl (saturated KCl) as reference electrode and platinum plate as the counter electrode. PGSTAT 100 N 100 V/250 mA type (Metrohm Autolab) was used for electroanalysis measurements. Electroanalysis of lead in waste water was performed in 0.1 M KCl as an electrolyte. From this research showed that the developed electroanalysis lead in waste water using platinum wire electrode are accurate, precise, reproducible and inexpensive with acceptable correlation of determination (R 2 = 0.999), LOD = 0.9029 mg/L , LOQ = 3.0098 mg/L and recovery = 100,67%. The methods can be used for the analysis of lead in waste water. This method is simplicity of sample preparation and use of low cost reagents are the additional benefit.