Prop counters, which are used gas-filled proportional counter detectors, were used by past generations of analyzers. The prop counter detection system provides broad peaks, thus zinc and copper were ...

It is probably rare that water does not contain traces of free ammonia, or salts, the acid of which has a greater affinity for the oxide of zinc than the base with which it is combined.

It found that although concentrations of ammonia and organic matter -- strongly associated with sewage effluent -- were important to influencing invertebrate diversity, the correlation with zinc ...

It found that although concentrations of ammonia and organic matter—strongly associated with sewage effluent—were important to influencing invertebrate diversity, the correlation with zinc and ...