主题：水样测铅特征浓度和检出限问题

原文由 shangdb 发表:
老兄：仪器的检出限和试样的检出限不是一个概念。试样的检出限应该是检测某元素的检测下线。

如标准方法浓度范围0.2--1.0,仪器的最低检出限为0.01,样品的浓度低于0.2或低于0.01能用这个方法测定吗?

应该分有仪器检测限（IDL），方法检测限（MDL）等的分别，下面是收集的一份资料，供大家参考。
What is the difference between DL, IDL, MDL, PQL, etc.? An IDL (Instrument Detection Limit) is the lowest limit that the instrument can detect. It is determined on samples which have not gone through any sample preparation steps. An MDL (Method Detection Limit) is similar to an IDL, but is based on samples which have gone through the entire sample preparation scheme prior to analysis. A PQL (Practical Quantitation Limit) is normally 3 to 10 times the MDL and is considered the lowest concentration that can be accurately measured, as opposed to just detected. DLs are actually determined by analysis of replicate low-level samples or blanks. This information gives the variation in instrument response at levels near the detection limit, from which 99% confidence limits are calculated from the standard deviation.

原文由 lxx 发表:
如标准方法浓度范围0.2--1.0,仪器的最低检出限为0.01,样品的浓度低于0.2或低于0.01能用这个方法测定吗?

必须浓缩或才用其它办法！

原文由 公子卓 发表:

原文由 lxx 发表:
如标准方法浓度范围0.2--1.0,仪器的最低检出限为0.01,样品的浓度低于0.2或低于0.01能用这个方法测定吗?

必须浓缩或才用其它办法！

浓缩的倍数是经过实验探索出来的吗?

浓度达到测定限以上就可以了。