The phrase "a moderate concentration of" is correct and usable in written English.
It can be used when discussing the amount or level of a substance or element in a particular context, such as scientific or analytical writing.
Example: "The study revealed a moderate concentration of pollutants in the water sample, indicating potential environmental concerns."
Alternatives: "a moderate level of" or "a reasonable amount of".
It was found that within the ranges tested, the greatest reductions of turbidity were achieved with a moderate concentration of calcium lactate at pH 5.
A sample prepared with a NaCl flux with a moderate concentration of solute exhibited the highest and stable photocatalytic activity for carbon monoxide production among the prepared samples.
The high-active state of palladium was associated with palladium in the metallic state with a high concentration of chemisorbed oxygen and a moderate concentration of a surface oxide.
A moderate concentration of an odorant might elicit moderate receptor responses, say (X1, X2, X3, X4) = (0.4, 0.5, 0.0, 0.0,.
However, exposure of C6 glioma cells to a moderate concentration of QUE-NLs (100 μM) downregulated the expression of JAK2, and pretreatment with AG490 synergistically affected this downregulation.
In cases with high anti-ssDNA antibodies, reactivity with RPA after incubation with ssDNA increased at a moderate concentration of ssDNA.
A moderate concentration (10%) of FeCl3 was used in this study, and the fibrinolytic system could dissolve fibrin, which is the main component of thrombus.
In addition, oral chemotherapy could maintain a sustained moderate concentration of the drug in the circulation to achieve a prolonged exposure of cancerous cells to the drug as well as to avoid high peak above maximum tolerable concentration.
A moderate concentration ratio and timely regenerations of the membrane should be arranged for acceptable efficiency in practice.
The effects seem to be concentration-dependent and too high a concentration acts negatively, thus suggesting an application of a moderate concentration.
Accordingly, following our first results sets of experiments, a moderate concentration was chosen for ongoing experiments based on its positive results.
