Sono-Electroanalysis: Application to the Detection of Lead in Petrol

摘要: The quantitative detection of lead in petrol is shown to be possible by anodic stripping voltammetry aqueous media under conditions insonation-induced emulsification. An immersion horn probe introduced into a thermostatted conventional three-electrode cell opposite mercury plated platinum disk working electrode. Under ultrasonic emulsification the sample, preconcentrated as an amalgam on Hg/Pt electrode surface via reduction at –1.0 V (vs. SCE). large mass transport associated with power ultrasound makes this step highly efficient. Subsequently quantified applying linear sweep potential from –0.15 V SCE) so oxidize Pb(0) Pb(II). area peak gives measure formed during initial step. By use standard microaddition solution system can calibrated give total amount present sample. Experiments using samples 4 star leaded gave content 380±40 mgL–1. This value was agreement that obtained independent laboratory atomic absorption spectroscopy (AAS). In addition high and insonation offers crucial benefits first activation cleaning, helping prevent fouling organic components second complete extraction water-insoluble target phase.