本powerpoint演示文稿首先概述砷癌斜率因子和最大污染限值（MCL）的推导。它接着概述了以下主题:美国环境保护局（USEPA）对砷癌症的修订 斜率因子； 低剂量致癌风险的证据；和 坡度系数修正对边坡稳定性的影响 MCL与背景风险 美国的砷暴露。

This powerpoint presentation begins by providing an overview of the arsenic cancer slope factor and derivation of the maximum contamination limit (MCL). It goes on to outline the following topics: U.S. Environmental Protection Agency (USEPA) revision of the arsenic cancer slope factor; evidence for cancer risk at low doses; and, implications of slope factor revision for the MCL and risk of background arsenic exposures in the U.S.