2. Academic Validation
  3. A direct injection liquid chromatography tandem mass spectrometry method for the kinetic study on iodinated contrast media (ICMs) removal in natural water

A direct injection liquid chromatography tandem mass spectrometry method for the kinetic study on iodinated contrast media (ICMs) removal in natural water

  • Chemosphere. 2020 Mar;243:125311. doi: 10.1016/j.chemosphere.2019.125311.
Israel J Lopez-Prieto 1,  Shimin Wu 2,  Weikang Ji 1,  Kevin D Daniels 3,  Shane A Snyder 4
Affiliations

Affiliations

  • 1 University of Arizona, Department of Chemical & Environmental Engineering, 1133 E. James E Rogers Way, Harshbarger 108, Tucson, AZ, 85721-0011, United States.
  • 2 University of Arizona, Department of Chemical & Environmental Engineering, 1133 E. James E Rogers Way, Harshbarger 108, Tucson, AZ, 85721-0011, United States; ER Environmental Protection Engineering TechnologyCo., Ltd., Shenzhen, 518071, China.
  • 3 University of Arizona, Department of Chemical & Environmental Engineering, 1133 E. James E Rogers Way, Harshbarger 108, Tucson, AZ, 85721-0011, United States; Hazen and Sawyer, 1400 E. Southern Avenue, Suite 340, Tempe, AZ, 85282, United States.
  • 4 University of Arizona, Department of Chemical & Environmental Engineering, 1133 E. James E Rogers Way, Harshbarger 108, Tucson, AZ, 85721-0011, United States; Nanyang Technological University, Nanyang Environment & Water Research Institute, Clean Tech One, 1 Cleantech Loop, #06-08, Singapore, 637141, Singapore. Electronic address: ssnyder@ntu.edu.sg.
PMID: 31759215 DOI: 10.1016/j.chemosphere.2019.125311
Abstract

Iodinated contrast media (ICMs) are a class of X-ray contrast media worldwide utilized for radiographic procedures. Since they cannot be removed efficiently during water treatment, they can be found in surface and groundwater. In this work, a rapid and sensitive direct injection liquid chromatography-tandem (LC-MS/MS) method for the simultaneous analysis of seven ICMs media (iopamidol, ioxitalamic acid, diatrizoic acid, iothalamic acid, iohexol, iomeprol and iopromide) in complex aqueous matrices has been developed and validated. The MDLs for the analytes ranged from 0.7 to 21 ng L-1 in ultrapure water, and recoveries ranged from 86 to 100% in drinking water, 85-103% in groundwater and 84-105% in WWTP effluent. A stereo-isomer for iopromide was separated. This analytic method was applied to investigate the removal of target ICMs by low pressure ultra violet LIGHT (LPUV) advanced oxidation processes with three oxidants, hydrogen peroxide, free chlorine and monochloramine in groundwater. Results showed that the addition of oxidants did not enhance attenuation of ICMs, since fluence-based decay apparent rate constants were similar (KUV = 3.2 × 10-3, KUV-Cl2 = 3.6 × 10-3 and KUV-NH2 = 3.4 × 10-3 10-3 cm2 mJ-1). This yielded direct photolysis is the main mechanism to attenuate target ICMs.

Keywords

Complex aqueous matrices; Direct injection; Iodinated contrast media; Liquid chromatography-tandem mass spectrometry; UV-Based oxidation processes.

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