The phrase "above certain concentrations" is correct and usable in written English.
It can be used when discussing thresholds or limits in scientific, technical, or analytical contexts, particularly in relation to substances or compounds.
Example: "The reaction only occurs above certain concentrations of the catalyst."
Alternatives: "beyond specific concentrations" or "at levels exceeding certain concentrations".
All these substances can harm human health when present above certain concentrations in drinking water.
Chromium VI) is present in several industrial wastewaters and it can cause health and environmental hazards above certain concentrations.
However, micron-sized homo-aggregates of ZrO2 were formed above certain concentrations of H2O and TBOZ due to self-aggregation of the nano-ZrO2 particles.
Above certain concentrations, DTPMP and calcium forms precipitate on Eagle Ford, which increases the attachment, and slightly acidic pH and high calcium concentrations enhance the precipitation.
Essential metals, such as Fe, Mn, Zn and Cu play a vital role in the biological processes but turn to be toxic above certain concentrations.
When testing in the United States does occur, residues of drugs used in aquaculture, or "fish farms," are sometimes found; above certain concentrations, these drugs are harmful to humans.
Restrictions of segmental motion of PM chains increase with functional groups concentration and above certain concentration (0.25 mmol g−1 PMM segments in the network assess faster motion suggesting a change in the local packing density and domain structure.
Later this year, a licence will be needed to legally buy the substance above a certain concentration.
Squeeze treatments consist of the batch injection of a chemical scale inhibitor (SI), which above a certain concentration, commonly known as MIC (Minimum Inhibitor Concentration), prevents scale deposition.
Above a certain concentration, of the order of 1 wt%, the absolute value of the ζ-potential reaches a saturation plateau.
Anisotropic two-dimensional scattering pattern due to shish-like structure formation was observed above a certain concentration of the high molecular weight PE.
