The phrase "although the concentration of" is correct and usable in written English.
It can be used to introduce a contrast or exception regarding the concentration of a substance or element in a particular context.
Example: "Although the concentration of pollutants in the river has decreased, the overall water quality remains poor."
Alternatives: "despite the level of" or "even though the amount of".
Although the concentration of antibodies is much higher in the early colostrum milk that is passed from mother to newborn, ongoing breastfeeding continues to help protect babies against infections.
The Bruges (or Ghent) of the Haute Savioe, might be a more accurate description, although the concentration of tourists might bring to mind Venice.
Although the concentration of carbon in the Earth's crust does not exceed 0.1 percent by weight, it is indispensable to life and constitutes humankind's main source of energy.
Although the concentration of OPBE increased ninefold, the product yield decreased from 95.2% to 82%.
Although the concentration of H2 decreases gradually, it is much lower than CO's.
The storage modulus of the fibers increased significantly although the concentration of MWNTs was relatively low (0.1 and 1.0 wt%).
Although the concentration of CRG was the same as that of SP-HRG, it exhibits a much lower absorption coefficient due to its poor dispersibility in water.
Although the concentration of crime at place is seemingly ubiquitous we found no empirical study showing a lack of concentration the amount of concentration varies.
Although the concentration of COD, TH, Ca++, Mg++, Cl−, Alk, and SO42− exhibited variations, it remained within the prescribed limit at all locations (Fig. 3).
Although the concentration of TS remain within prescribed limit, it showed anomalous high increase between February, 2008 September, 2008 and May, 2009 May, 2010 at all observed locations.
The oxidized CNT had better effect on the seed germination than the CNT alone, although the concentration of the oxidized CNT was much lower.
