美国环境保护局（USEPA）地下水和地下水管理办公室 饮用水技术支持中心（TSC）已经开发了一个更新的计算器 确定定量水平，称为最低浓度最低报告 级别（LCMRL）。LCMRL是一种多浓度程序，其中最低浓度为 高置信度（99%）预测未来复苏的浓度介于 回收率分别为50%和150%。该程序同时考虑了精度和准确性 时间这是TSC在第二个周期中首次实施 不受监管的污染物监测规则，由美国环保局在线提供。未来的目标 修订后的程序包括使其更坚固、更易于使用，而无需创建额外的 实验室社区的负担。这是通过包含一个新的变量来实现的 该模型涵盖了所有方差情况，并结合了非线性均值回归模型。 尽管新计算器基于更严格的统计方法，但用户界面 一直保持简单和用户友好。新方法处理更广泛的现实世界 并达到项目的改进目标。包括4个参考文献、图表。

The U. S. Environmental Protection Agency's (USEPA's) Office of Ground Water and Drinking Water Technical Support Center (TSC) has developed an update to the calculator for determining the quantitation level, known as the Lowest Concentration Minimum Reporting Level (LCMRL). The LCMRL is a multi-concentration procedure where the lowest true concentration for which future recovery is predicted with high confidence (99%), to be between 50 and 150% recovery. The procedure takes into account precision and accuracy at the same time. It was implemented for the first time by TSC in conjunction with the second cycle of the Unregulated Contaminant Monitoring Rule and made available online by USEPA. Goals for the revised procedure included making it more robust and easier to use without creating an additional burden on the laboratory community. This was accomplished by including a new variance model that covers all cases of variance and by incorporating nonlinear mean regression models. Although the new calculator is based on a more rigorous statistical approach, the user interface has been kept simple and user-friendly. The new approach handles a wider range of real world situations and met the improvement goals for the project. Includes 4 references, figures.