2-Aminoethanol [MAK Value Documentation in German language, 2016]†

MAK Value Documentation for 2-Aminoethanol The German Commission for the Investigation of Health Hazards of Chemical Compounds in the Work Area has re-evaluated the maximum concentration at the work place (MAK value) of 2-aminoethanol, considering the endpoints respiratory tract irritation, developmental toxicity, and skin absorption. Available unpublished study reports are described in detail. Critical effect of 2-aminoethanol is the local respiratory tract irritation. New 5-day and 28-day-guideline-studies with rats show time- and dose-dependent effects in larynx (squamous metaplasia, inflammation, necrosis), trachea (squamous metaplasia, inflammation), and lung (hyperplasia of mucous and goblet cells). The NOAEC is 10 mg/m3 (3,95 ml/m3). Since 2014, the Commission uses an empirical approach to set MAK values for substances with critical effects on the upper respiratory tract or the eyes. Based on this approach, a concentration of 0.22 ml/m3 for the work place air can be calculated from this study, resulting in a MAK value of 0.2 ml/m3. Since the critical effect is irritation, Peak Limitation Category I is retained with an excursion factor of 1 as the substance is corrosive. After scaling the oral NOAEL for developmental toxicity of 75, 225, and 500 mg/kg body weight and day for rabbits (dermal) and rats (dermal, oral), respectively, to an inhalation concentration at the work place, the differences to the MAK value, are considered sufficient, and damage to the embryo or foetus is unlikely when the MAK value is observed. Therefore, classification in Pregnancy Risk Group C is confirmed. Absorption via skin does not contribute significantly to the systemic toxicity of 2-aminoethanol. Keywords: 2-Aminoethanol; 2-Ethanolamin; Monoethanolamin; Toxikokinetik; Metabolismus; (sub)akute Toxizitat; (sub)chronische Toxizitat; Reizwirkung; Arbeitsstoff; maximale Arbeitsplatzkonzentration; MAK-Wert; Spitzenbegrenzung; fruchtschadigende Wirkung; Hautresorption; Toxizitat; Gefahrstoff