期刊
TALANTA
卷 147, 期 -, 页码 322-327出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2015.09.074
关键词
Benzotriazoles; Benzothiazoles; Benzenesulfonamides; Emerging pollutants; Microwave-assisted extraction; Soil
Benzotriazoles (BTRs), benzothiazoles (BTs) and benzenesulfonamides (BSAs), compounds largely used in industrial and household applications, are ubiquitous emerging contaminants. In this work a novel, straightforward procedure for the simultaneous determination of two BTRs (1H-benzotriazole, 5-methyl-1H-benzotriazole), three BTs (benzothiazole, 2-hydroxybenzothiazole, 2-methylthiobenzothiazole) and two BSAs (benzenesulfonamide, toluenesulfonamide) in soil has been developed. The target analytes were extracted from soil by a single low-pressurized microwave-assisted extraction (MAE) cycle (120 degrees C, 10 min) and quantified by high-performance liquid chromatography with UV detection. For all the seven analytes, quantitative extraction yields (72-119%, n=4) were observed from recovery tests on soil samples (1 g) spiked with 5, 10 and 50 mg kg(-1), using 4 mL water-methanol (85:15) as extracting solution. For the lower concentrations levels (100, 250 and 500 mu g kg(-1)), the analytes were extracted from soil samples (2-3 g) using 6 mL methanol, and the extract was pre-concentrated by evaporation before analysis; recoveries in the range 70-117% were obtained (n=4). Suitable intra-day and inter-day precision were observed, with values of relative standard deviation generally below 6% and 11% (n=4), respectively. Linearity was evaluated in the concentration range 0.5-10 mg L-1 by matrix-matched standards, obtaining r(2) >0.9996. The experimental method quantification limit (MQL) was 100 mu g kg(-1). The entire procedure has been successfully applied to the analysis of real impacted soil samples. (C) 2015 Elsevier B.V. All rights reserved.
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