The phrase "a decrease in the concentration of" is correct and usable in written English.
It can be used in scientific or analytical contexts to describe a reduction in the amount of a substance present in a solution or mixture.
Example: "The experiment showed a decrease in the concentration of the reactant over time."
Alternatives: "a reduction in the level of" or "a decline in the amount of".
A decrease in the concentration of surface oxygen species was correlated with iron reduction.
Heat stress disrupts the association between corals and dinoflagellates leading to a decrease in the concentration of symbionts within coral tissue16,17.
In wastewater samples, a decrease in the concentration of the analysed compounds through the different treatments was observed.
Similarly, samples that are to be assayed for trace levels of metallic pollutants are pretreated in order to prevent a decrease in the concentration of the pollutant that is caused by adsorption on the walls of the sample vessel.
The reduction in toxicity was directly correlated to a decrease in the concentration of 2,4-DCP in the treated solutions, as measured by high-performance liquid chromatography.
Ultimate sulphur uptakes are decreased by an increase in the concentration of O2, as well as by a decrease in the concentration of SO2.
Analysis of the elemental ratios by X-ray photoelectron spectroscopy (XPS) showed an increase in the concentration of oxygen, resulting in a decrease in the concentration of carbon and the formation of new carbon oxygen structures.
A sharp increase in the δ13C value of the dissolved inorganic carbon and a decrease in the concentration of HCO3− indicate that hydrogenotrophic methanogenesis is occurring in the first 15 cm of the FeOC column.
When studying the ubiquitous and practically significant phenomena of annealing or aging of carbon materials, it is instructive to distinguish the reduction of site (re)activity from a decrease in the concentration of (re)active sites.
X-ray photoelectron spectra showed a decrease in the concentration of imine groups as well as the co-existence of ionized and unionized phosphates independent of the doping level.
Dialysis led to a decrease in the concentration of impurities in the dispersion, which included heavy metal ions and alkali metal ions known to result in a rough etched surface and affect the electronic properties of the semiconductor.
