"concentrations are established" is correct and can be used in written English.
You can use it when you need to explain that a certain concentration of something has been determined or set. For example: "The Environmental Protection Agency has established new regulations for air quality, with nitrogen dioxide concentrations not to exceed 100 parts per million."
Elevated serum phosphate concentrations are established risk factors for cardiovascular disease and mortality in chronic kidney disease (CKD).
As an example, the ternary CuZnAl system is considered, for which, based on the available experimental data, the non-generic concentrations are established.
It is important to note that maximum concentrations are established for each component of a product during the authorization process, while the actual concentration of a component in a marketed product may be lower (in case of the a.s., within a regulatory accepted range that ensures sufficient efficacy).
In the backdrop of the need for high spatio-temporal resolution data on PM2.5 mass concentrations for health and epidemiological studies over India, empirical relations between Aerosol Optical Depth (AOD) and PM2.5 mass concentrations are established over five Indian mega cities.
However, in the group with end-stage CKD increased TAT or fibrinogen concentrations are established in respectively 15%and40%0% of the subjects, indicating activation of the coagulation pathway or an acute phase response already before the beginning of a new HD session.
For PFOS, a correlation between the tissue and serum concentrations was established.
An optimum airflow producing the lowest particulate matter (PM) concentrations was established for the FD cookstove.
Some relationships between the viscosity of these polymer solutions, their molecular weight and their solution concentrations, were established and their validity checked.
The relative cDNA concentrations were established by a standard curve using sequential dilutions of corresponding PCR fragments.
The adult ion composition, characterized by a high K+ concentration and low Na+ and Ca2+ concentrations, is established during postnatal development [12], [17], [18].
Mechanism of ion transport, that are well established in the postnatal cochlea, cannot be extrapolated to the embryonic stage since the adult ion composition of the luminal fluid, which is characterized by a high K+ concentration and low Na+ and Ca2+ concentrations, is established only during postnatal development [12], [17], [18].
