Use of selective quenching of a photoluminescent probe based on a Eu(III) ß-diketonate complex for determination of methylmercury in produced water after liquid-liquid extraction.
Talanta
; 244: 123406, 2022 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-35364339
ABSTRACT
An Eu(III) ß-diketonate complex was produced and employed as a photoluminescent probe to determine methylmercury (CH3Hg+). To establish its molecular structure, the Eu(III) complex was characterized by elemental (CHNS) and thermogravimetric analyses and infrared spectroscopy. After establishing robust conditions to use the Eu(III) complex as an analytical probe, it was employed for the analysis of produced water (PW) samples with the analytical response based on the luminescence suppression proportional to the concentration of CH3Hg+ (a linear model after normalization of the response within the concentration range from 0.2 µg L-1 up to 2.0 µg L-1). Selectivity was guaranteed by a simple liquid-liquid extraction of the analyte in dichloromethane, which also allowed a 50 times pre-concentration factor. The instrumental limit of quantification of 0.2 µg L-1 is equal to the limit established in Brazilian resolution for total mercury content in waters, but pre-concentration (50 times factor) improved the overall method limit of quantification down to 4 ng L-1. Recovery results agreed with the ones achieved using cold vapor atomic absorption spectrometry.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Mercúrio
/
Compostos de Metilmercúrio
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Talanta
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Brasil