Assessment of occupational exposure to hexavalent chromium – recommendations from HBM4EU chromate study

Introduction: Hexavalent chromium (Cr(VI)) is an important occupational carcinogen. In addition to air monitoring biomonitoring is commonly applied to monitor exposure to Cr(VI). Within the EU biomonitoring initiative, HBM4EU, we explored the applicability of different biomonitoring methods in the assessment of occupational exposure to Cr(VI) in welding and surface treatment activities. Materials and Methods: A multi-center cross-sectional study was performed in Belgium, Finland, France, Italy, Poland, Portugal, the Netherlands, Luxembourg and United Kingdom. Harmonized procedures were used to collect biological and industrial hygiene samples. Contextual information was collected using questionnaires. Altogether 602 exposed workers and controls were included in the study. Exposure biomarkers studied included urinary, red blood cell (RBC) and plasma Cr, and exhaled breath condensate (EBC) Cr(VI)/Cr(III). In addition, number of effect biomarkers were studied. Results: All exposure markers showed highest exposure levels among chrome plating workers. U-Cr showed a good correlation with air Cr(VI) in bath platers and welders. Observed low correlations between different exposure biomarkers suggest that these approaches are not interchangeable but rather complementary. Conclusions: U-Cr showed its value as the first approach for the assessment of internal exposure to Cr(VI). We recommend pre- and post-shift samples for low exposure levels. RBC/P-Cr and EBC-Cr(VI)/Cr(III) provide additional information when more specific information on exposure is needed. The current exposure levels require analytical methods with high sensitivity.

Description

The Study Group - Portugal: Susana Viegas, Carina Ladeira, Edna Ribeiro, Ana Sofia Simões Zeferino, Adriano Pereira, ESTeSL Maria João Silva, Henriqueta Louro, Célia Ventura, Ana Tavares, Bruno Gomes, Catarina Afonso, Hermínia Pinhal, Ana Nogueira, Sílvia Reis Santos, Rodrigo Moreira, INSA