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1 MAK值及其制定程序除美国政府工业卫生师协会(ACGIH)推荐的阈限值-时间加权平均浓度(TLV-TWA值)外,德国工作场所化学物质最高容许浓度(maximum workplace concentration,MAK)值也是我国制定职业接触限值时的主要参考依据。MAK定义为工作场所空气中化学物质(以气体、蒸气或颗粒物形式存在)的最高容许浓度,根据现有认知水平,该浓度对反复、长期接触(通常为每天8 h、每周平均工作40 h)该物质的作业工人通常不造成健康损害和不适。其含义与美国ACGIH的TLVTWA值一致,都是一个工作日或工作班的平均值。MAK值的制修订工作由德国科学基金会(DFG)下属的
1 MAK values and their formulation procedures In addition to the maximum limit concentration-time-weighted average concentration (TLV-TWA) recommended by the ACGIH, the maximum workplace concentration (MAK) Value is also the main reference when setting the occupational exposure limit in our country. MAK is defined as the maximum allowable concentration of chemical (as a gas, vapor or particulate) present in the air of a workplace and based on current levels of cognition, this concentration is indicated for repeated, prolonged exposure (usually 8 hours per day, 40 per week on average h) Workers of the substance normally do not cause health damage and discomfort. Its meaning and the United States ACGIH TLVTWA values are consistent, are the average of a weekday or work class. MAK value revision work by the German Science Foundation (DFG) under the