"chemical indicator" is correct and usable in written English.
You can use it to generally refer to any type of indicator that detects a chemical change. For example, "We used a chemical indicator to detect the presence of acid in the solution".
If no spontaneous colour change occurs during the titration, a small amount of a chemical indicator is added to the analyte prior to the titration.
Furthermore, the carbonyl area index can be used as a chemical indicator to effectively reflect the aging level of asphalt binder.
The chemical indicator substances are intended to support comparisons between watersheds and technical and natural processes independent of specific water cycles and to reduce efforts and costs of chemical analyses without losing essential information.
While in the case of a perfectly homogeneous chemical indicator distribution only seven different fingerprints should be visible in Fig. 3a, the obtained fingerprints form a continuous distribution, evidencing a high level of non homogeneity in the deposition.
They measured caffeine, fecal coliforms, and the antiseizure medication carbamazepine, another candidate chemical indicator of human sewage contamination.
The newly evolving melatonin receptors might thus have recognized melatonin as a "chemical indicator of darkness" for the circadian regulation of some physiological process and/or behavior.
The idea is that he can to detect various chemical indicators in her urine that indicate whether she's prepared to mate.
However, chemical indicators are not always reliable for indicating process acidification.
The properties of image sensors may be fully exploited imaging a chemically sensitive surface coated by a continuous layer of chemical indicators.
He also advanced a theory of chemical indicators.
The chemical indicators phosphorus (P) and potassium (K) were also analyzed.
