Chinese Journal of Applied Chemistry ›› 2021, Vol. 38 ›› Issue (2): 236-244.DOI: 10.19894/j.issn.1000-0518.200365

• Full Papers • Previous Articles    

Determination of Two Sulfonamides in Environmental Water Based on Dispersivesolid-Phase Extraction with MIL-101(Cr) Metal-Organic Framework

ZHANG Ming-Shan, LI Teng-Ya, LEI Yu, WU Yan, HE Shu-Hai*   

  1. Hainan Ecological Environment Monitoring Center, Haikou 571126, China
  • Received:2020-12-07 Accepted:2021-01-12 Online:2021-02-01 Published:2021-04-10

Abstract: Three metal-organic frameworks (MIL-101(Cr), MIL-101(Cr)-SO3H, MIL-101(Cr)-NH2) were used as adsorbents, and the adsorption properties of sulfadiazine and sulfadiazine were compared in environment water under different pH conditions by solid phase dispersion extraction. With MIL-101(Cr) as the best adsorbent, the main factors affecting the efficiency of adsorption and desorption, such as the amount of adsorbent used, adsorption time, type and amount of desorption solvent, and desorption time were investigated. The optimized extraction conditions were as follows: 10.0 mL of sample solution (pH=9.0) was extracted with 6.0 mg of MIL-101(Cr) adsorbent for 4.0 min, the supernatant was removed by centrifugation, and the sample was resolved with 1.5 mL of 2% (volume fraction) formic acid-methanol solution for 10.0 min. The results show that the linear range of two sulfonamides are 5.0~8000 μg/L, and r>0.9990. The detection limits of the method are 0.05 μg/L to 0.08 μg/L. The recoveries of the three spiked concentrations are from 71.2% to 91.9%. The relative standard deviations (RSDs) are in the range of 3.1%~8.5%.

Key words: Metal-organic frameworks, Dispersive solid-phase extraction, Sulfonamides, Environmental water

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