| 摘要 |
In a method of identifying sources of water pollution, buoyant indicator elements which identify the source of polluting material are injected into the polluting material and discharged with the material into a body of water to enable the pollution to be traced to its source. In a preferred embodiment, the indicator elements comprise a plurality of buoyant pellets having indicia which identify the source of discharged material. The pellets can be provided with absorptive cores for absorbing a portion of the discharged material to enable the type of polluting material to be determined by examination of the discharged pellets.
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