Abstract
Dispersive liquid−liquid microextraction solidified floating organic drop (SFOD−DLLME) technique was used for sample treatment and extraction of hexavalent chromium from spiked and real samples of workplace ambient air and urine of chromium electroplating workers. Validation of the SFOD−DLLME technique with three solvents, namely, 1-undecanol, 2-dodecanol and n-hexadecane, showed that pH 4, stirring rates of 600 rpm for 1-undecanol and 2-dodecanol and 800 rpm for n-hexadecane, extraction times of 10 min for 1-undecanol and 2-dodecanol and 15 min for n-hexadecane were the conditions allowing to reach the highest extraction efficiency. The maximum acquired enrichment factor was 211 and LODs were in the range of 0.015–0.05 µg/L, and the calibration curves were linear in the range of 0.5–30 µg/L. The results showed that SFOD−DLLME coupled with atomic absorption spectroscopy is a precise and sensitive technique for the determination of hexavalent chromium for biological monitoring of occupational/environmental samples.
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Support of this research by the vice chancellor of research and technology of Guilan University of Medical Sciences (grant no. 93121903) is gratefully acknowledged.
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Pourbakhshi, Y., Heidari, M., Yahaei, E. et al. Dispersive Liquid–Liquid Microextraction Followed by Solidified Floating Organic Drop for Hexavalent Chromium Determination: a Method for Occupational and Environmental Exposure Monitoring for Heavy Metals. J Anal Chem 76, 714–720 (2021). https://doi.org/10.1134/S1061934821060083
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DOI: https://doi.org/10.1134/S1061934821060083