Pustaka Ilmiah Universitas Padjadjaran

Abstrak

The Development Of Differential Pulse Anodic Stripping Voltammetry Method To Determine Of Ziram (Fungicide Ditiocarbamat) With Hanging Mercury Drop Electrode (Hmde)

A differential pulse anodic stripping voltammetric technique has been used previously for the determination of the pesticide, ziram, in rice samples using a static mercury drop electrode. Based on Mathew’s research, differential pulse anodic stripping voltammetric was developed to distinguish inorganic zinc and ziram zinc in sodium acetate-sodium chloride media using a hanging mercury drop electrode (HMDE). The determination of ziram using the HMDE was studied in various conditions of : supporting electrolytes, deposition potential, deposition time, scan rate and modulation amplitude. The result of the study indicated that zinc chloride (inorganic zinc) and ziram zinc could be differentiated as they give well-resolved peaks at -1.16 V and -1.00 V vs Ag/AgCl(KCl 3M) electrode in sodium acetate- sodium chloride media. The stripping signal attained a maximum at a deposisiion potensial of -1.3 V for 300 seconds and anodically scan the potential from -1.4 V to -0.8 V with a scan rate of 2 mV/s and a modulation amplitude of 25 mV. The analytical performance characteristics of the probe indicated : precision 0.1 – 1.4 %, sensitivity 1ìg/L/nA and the calibration plot is linear up to 305 ìg/L.