Assessment of the metabolite of chlororganic pollutants content in urine of workers of polyvinychloride production

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Abstract

Introduction. The control and study of changes in the composition of biomedical samples under the influence of toxicants makes it possible to carry out early diagnostics, to reveal occupationally caused diseases. Vinyl chloride (VC) is a compound widely used in the chemical industry, the production of which is continuously growing all over the world, as well as the number of workers employed in it. Thiodiacetic acid (TDAA) is the main metabolite of vinyl chloride and its urinary excretion is associated with its level of exposure.

Material and methods. The study was conducted in a linked sample of 19 workers in the dynamics of two-day 12-hour shifts after a three-day weekend. For 10 workers from this group, a more in-depth study of the dynamics of TDАА excretion before and after the shift was carried out: three 12-hour shifts. The analysis of TDAA in urine was carried out by chromatography-mass spectrometry using an Agilent 7890A gas chromatograph with an Agilent 5975C mass-selective detector. To find the optimal parameters for temperature, reaction time, catalyst type, mathematical planning of the 3-factor experiment was carried out. The identification of the TDAА derivative on mass chromatograms was carried out by the absolute retention time (10.36 min) and the intensity ratio of the peaks of the detected ions (146, 178).

Results. Studies have shown average levels of TDAA in the urine of professional groups of workers (apparatchiks, cleaners) to be significantly higher before the next shift (12 hours after the end of the previous shift) than at the end of the previous shift and 1.99 times for operators (p = 0.004) and 2.61 times for cleaners (p = 0.002). Further, there was a significant decrease in the average level of TDAA in the urine relative to the beginning of the shift: 1.72 times for operators (p = 0.006) and 1.62 times for cleaners (p = 0.003).

Conclusion. This analyte can be considered as an informative indicator of the presence of the production effect of VC from the point of view of evidence-based medicine, further confirmation of the need for studies of markers in persons in contact with this toxicant.

About the authors

Olga M. Zhurba

East-Siberian Institute of Medical and Ecological Research

Author for correspondence.
Email: zhurba99@gmail.com
ORCID iD: 0000-0002-9961-6408

PhD, head of laboratory of analytical ecotoxicology and biomonitoring of the East-Siberian Institution of Medical and Ecological Research, Angarsk, 665827, Russian Federation.

e-mail: zhurba99@gmail.com

Russian Federation

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