The phrase "a much lower concentration" is correct and usable in written English.
It can be used when comparing the levels of a substance or element in different contexts, such as scientific or analytical discussions.
Example: "The new formula resulted in a much lower concentration of harmful chemicals compared to the previous version."
Alternatives: "a significantly reduced concentration" or "a considerably lower level".
Meanwhile, the bioavailability of tocotrienols in plasma has been reported at a much lower concentration than alpha-tocopherol9,10.
By contrast CBZ, tested at a much lower concentration (17 μm) in combination with SRT (5 μm), produced prominent cytotoxicity within 15 min exposure.
You can use oil for dabbing or, at a much lower concentration, in e-cigarette pens, allowing users to get stoned in public without the police knowing.
In this work, tile displacement experiments were performed at a much lower concentration compared to typical strand displacement systems (2 nM vs. 100 nM).
The capillary filtrate has a much lower concentration of colloidal and suspended particles than can be produced in a conventional pretreatment process.
MEBD is likely to occur at doses that have classically been defined as sub-therapeutic (i.e. at a much lower concentration than MED), since MED is rarely measured using a continuously applied drug.
A much lower concentration of the maleated elastomer (SEBS-g-MA) was required for effective toughening of these polyamides with higher CH2NHCO ratios.
A designed ssDNA fragment of severe acute respiratory syndrome (SARS) virus at a much lower concentration than the target ssDNA(I) was also recovered with high efficiency and good selectivity.
The researchers also showed that Focetria, which has not been linked to narcolepsy, had a much lower concentration of nucleoprotein than Pandemrix did.
A similar trend was observed for the standard drug, isoniazid (INH) which exhibited a dose dependent efficacy, though at a much lower concentration levels (Fig. 6).
It can be seen that the detachment of bubbles from the heating surface in the tap water is faster than that of demineralized water because there is a much lower concentration of mineral ions and small particles inside the water.
