Development of a Spectrophotometric Sequential Injection Methodology for Online Monitoring of the Adsorption of Paraquat on Clay Mineral and Soil

Autor:	Jorge C. Masini, Carlos M. C. Infante
Rok vydání:	2007
Předmět:	Chromatography Vermiculite Dithionite Atomic and Molecular Physics and Optics Analytical Chemistry Sodium dithionite chemistry.chemical_compound Sequential injection Adsorption Paraquat chemistry Adsorption kinetics Environmental chemistry Clay minerals Spectroscopy
Zdroj:	Spectroscopy Letters. 40:3-14
ISSN:	1532-2289 0038-7010
DOI:	10.1080/00387010601089321
Popis:	The reduction of paraquat by sodium dithionite in alkaline solution was explored to develop an automated, spectrophotometric, sequential injection method for online determination of the herbicide in suspensions of solid adsorbents. A tangential filter was used for interfacing the suspension and the analyzer. The linear dynamic range was between 0.1 and 20 mg L−1, with detection and quantification limits of 0.039 and 0.10 mg L−1, respectively. Sampling throughput was 102 hr−1. Precision at the 5 mg L−1 paraquat concentration was 2.9%, with a consumption of dithionite of 1 mg per analysis. The method revealed that adsorption of paraquat onto vermiculite is faster and quantitative in comparison with a tropical soil. The authors were invited to contribute this paper to a special issue of the journal entitled “Spectroscopy and Automation”. This special issue was organized by Miguel de la Guardia, Professor of Analytical Chemistry at Valencia University, Spain. The special issue was published in volume...
Databáze:	OpenAIRE
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