Addendum zu Molybdän und seine Verbindungen [BAT value documentation in German language, 2019]

In 2018, the German Commission for the Investigation of Health Hazards of Chemical Compounds in the Work Area has re‐evaluated Molybdenum and its compounds. Available publications are described in detail. In recent publications since the last evaluation in 2005 some authors investigated Molybdenum concentrations in blood or urine with respect to occupational Molybdenum exposure, however, without a conclusive outcome: The results of the different studies were either contradictory or missed respective exposure data and/or quality control measures. Therefore, no BAT value (biological tolerance value) was derived. However, some studies reported background concentrations in men, women or children, most of them with sufficiently applied quality control. In these studies, it was found that nutrition is the most important contribution to Molybdenum in urine. Several studies with quality control means and with sufficient statistical power revealed similar concentration ranges between 34–50 µg/L urine and/or 95% percentiles around 150 µg/L urine. In conclusion, a BAR of 150 µg Molybdenum/L urine was derived.