A simple method for the determination of methyl-triclosan in water samples

MAC LOUGHLIN TOMÁS MARIANO; PELUSO, LETICIA; FERNANDO DE LA TORRE; EMANUEL SAGER; MARINO, DAMIÁN J. G.

Waco, TX

Congreso; 9 TH YOUNG ENVIRONMENTAL SCIENTISTS MEETING; 2020

Triclosan (TCS) is a bactericide widely used in personal care products such as shampoo, deodorants, and toothpaste.Along with its metabolite, methyl-triclosan (MeTCS), they can reach surface water through wastewaters, as they arenot removed in traditional wastewater treatment plants. Although TCS is easily degraded by photolysis, MeTCS ismuch more persistent. While TCS can be directly analyzed by LC-ESI-MS, MeTCS must be analyzed by GC-ECD/MS,given low ionization by ESI and thus undesirable limits of detection. A fast and simple extraction method wasdeveloped using low temperature partitioning for waste and bioassay water samples, the later where fish wereexposed to TCS. A 1-mL aliquot was placed in a 2-mL vial, followed by 200 uL of a 10% NaCl solution and 100 uL oftoluene. The vial was shaken in a vortex mixer for 30 seconds, allowed to stand for 2 minutes and placed in a freezer,here the organic solvent (top layer) did not freeze. A volume of 3 μL was injected in a GC-uECD. Recovery on spikedsamples was 82% ± 2%. Method was linear in the range tested (1 to 500 ug.L-1), with a Relative Standard Deviation-RSD