本文介绍了对适宜于人工湿地床的示踪剂筛选的原则和方法，从四种染料和食盐中，选定食盐作为人工湿地床的示踪剂，并介绍了食盐示踪剂的注入方法和检测系统。

The principle and method of the tracer screening for constructed wetland bed are introduced. NaCl is selected from four kinds of dye and NaCl. The input and detection method of NaCl are defined.

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