Green chemistry as a tool for environmental management in testing laboratories: application in the determination of mercury in water by cold vapor atomic absorption spectrophotometry
La química verde como herramienta para la gestión ambiental en laboratorios de ensayo: aplicación en la determinación de mercurio en aguas por espectrofotometrìa de absorciòn atómica de vapor frío
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ABSTRACT:
Test laboratories that analyze parameters in environmental matrices usually use standard analysis methods that involve storage, handling of raw materials and management of the waste generated. In the case study laboratory, there is a problem due to the partial control in the generation and disposal of waste, use of raw materials and dangerous reagents, as well as methods that involve pretreatment and sample sizes that generate considerable volumes of waste. The objective is a diagnosis of the environmental performance of the methods used in the analysis of environmental matrices with main emphasis on the case study and respective comparison of two methodologies for the determination of mercury, followed by a multicriteria analysis (TOPSIS, RGB, HEXAGON) to assess the greenness of the analytical process. This article, as a product of the comparative analysis, proposes the implementation of an analytical method based on the EPA 7473 standard (Mercury) in aqueous matrices with a favorable impact on the greenness of the analytical method, a decrease in the carbon footprint and the generation of volumes of contaminated samples. with heavy metals as an alternative to conventional methodologies such as cold vapor atomic absorption spectrophotometry (CVAAS). RGB multicriteria evaluation showed good analytical performance. HEXAGON showed a high penalty for the use of dangerous reagents. Finally, TOPSIS was identified as the method with the greatest simplicity of operation.
Keywords: Analysis laboratory; Environment; green chemistry; Waste.
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