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Framework for Human Health Risk Assessment of Noncancer Effects Resulting from Short-duration and Intermittent Exposures to Chemicals

机译:短期和间歇性接触化学品导致的非癌症影响的人类健康风险评估框架

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Durations of exposure to chemicals for single, repeated or intermittent periods, often vary from those upon which most guidance values are based. Since it is not feasible to conduct toxicity studies or develop Toxicity Reference Values (TRVs) specific to each scenario of interest, a framework was developed to improve the scientific basis for the evaluation of short-duration and intermittent exposures in a variety of settings, drawing as much as possible on existing TRVs. The framework incorporates the use of TRVs based on exposure periods as similar as possible to the 'actual' exposure periods and an integrated, tiered approach that addresses the potential for non-cancer effects resulting from continuous short-duration and intermittent exposures. Higher tiers entail more effort and consideration of additional information. The framework outlines considerations relevant to identifying when existing TRVs can be applied directly (in lower tiers), or appropriately adapted to assess the acceptability of short-duration or intermittent exposure scenarios, taking into account toxicokinetic and toxicodynamic considerations. The framework is illustrated by a number of case studies and based on the outlined approach, recommends application of dose averaging only under limited, specified conditions.
机译:一次,重复或间歇性暴露于化学品的持续时间通常与大多数指导值所依据的持续时间有所不同。由于进行毒性研究或开发针对每种关注情景的特定毒性参考值(TRV)是不可行的,因此开发了一个框架来改善各种环境下短期和间歇性暴露评估的科学基础,尽可能在现有的TRV上使用。该框架结合了基于与“实际”暴露期尽可能相似的暴露期的TRV的使用,以及一种集成的,分层的方法,该方法解决了由于持续时间短和间歇性暴露而产生非癌效应的可能性。更高的层需要付出更多的努力并考虑其他信息。该框架概述了考虑到毒物动力学和毒物动力学方面的考虑因素,这些考虑因素与确定何时可以直接(在较低级别)应用现有的TRV或适当调整其以评估短期或间歇性暴露情况的可接受性有关。许多案例研究都说明了该框架,并基于概述的方法,建议仅在有限的指定条件下应用平均剂量。

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