Assertion: phosphate's concentration | /r/HasProperty | parts per billion
Facets:
Source sentences:
text: A determination of the presence of a fluorescent tracer(s) and preferably the concentration thereof in the feedwater and/or blowdown from a boiler system can be made when the concentration of the tracer(s) in the feedwater and/or boiler is only several parts per million (ppm) or even parts per billion (ppb) for some of the tracer(s) that can be employed in the process of the present invention.