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ABSTRACT
On-line in-tube solid phase microextraction (in-tube SPME) coupled to high performance liquid chromatography and tandem mass spectrometry (HPLC-MS/MS) was successfully applied to the determination of selected triazines in water samples. The method based on the employment of a packed column containing graphene oxide (GO) supported on aminopropyl silica (Si) showed that the extraction phase has a high potential for triazines extraction aiming to its physical-chemical properties including ultrahigh specific surface area, good mechanical and thermal stability and high fracture strength. Injection volume and loading time were both investigated and optimized. The method validation using Si-GO to extract and concentrate the analytes showed satisfactory results, good sensitivity, good linearity (0.2–4.0 µg L−1) and low detection limits (1.1–2.9 ng L−1). The high extraction efficiency was determined with enrichment factors ranging from 1.2–2.9 for the lowest level, 1.3–4.9 intermediate level and 1.2–3.0 highest level (n = 3). Although the analytes were not detected in the real samples evaluated, the method has demonstrated to be efficient through its application in the analysis of spiked triazines in ground and mineral water samples.
Acknowledgments
The authors would like to thank Brazilian Federal Agency for the Support and Evaluation of Graduate Education (CAPES) by grant and scholarship (1480653/2015). Likewise financial support grants (2015/15462-5 and 2014/07347-9) from São Paulo Research Foundation (FAPESP) and from the Brazilian National Council for Scientific and Technological Development (CNPq) are acknowledged by the authors (Proc. 307293/2014-9)