Stripping potentiometry for organolead compounds: application to the determination of total lead in gasoline
| Autor: | Daniel Jagner, Yudong Wang, Lars Renman |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Detection limit
Stripping (chemistry) Chemistry Tetraethyllead Analytical chemistry Biochemistry Analytical Chemistry law.invention Matrix (chemical analysis) Anodic stripping voltammetry chemistry.chemical_compound Nitric acid law Environmental Chemistry Sample preparation Atomic absorption spectroscopy Spectroscopy |
| Zdroj: | Analytica Chimica Acta. 267:165-169 |
| ISSN: | 0003-2670 |
| DOI: | 10.1016/0003-2670(92)85019-3 |
| Popis: | A 10-pi gasoline sample is added 10590 pi of a modifying matrix composed of 15 g 1 mercuuy(II), 050 M nitric acid and 1% (v,/v) Triton X-100 in 90% ethanol Tetraethyl- andlor tetramethyllead (TEL and TML, respectively) are reduced and simultaneously amalgamated on a glassy carbon electrode employing a pulsed electrolysis sequence, and the amalgamated lead is re-oxidized by means of a constant current One analysis, which us performed automatically under computer control with a commercial potentuometruc stnpping analyser, takes approximately 5 min including the time for sample preparation and result evaluation The system us calibrated by means of a single-point calibration using a standard prepared in usooctane and containing 15 mg I u of lead, half from TEL and half from TML The relative difference in sensitivity between TEL and TML is 8%, un accordance with theory The method us best suited for unleaded gasoline with total lead concentrations in the range 0 1u30 mg l of total lead The results obtained agree well with those obtained by atomic absorption spectrometry The estimated precision is 4u8% (R S D) and the detection limit 007 mg Iu1 of total lead |
| Databáze: | OpenAIRE |
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