The phrase "although concentrations" is correct and usable in written English.
It can be used to introduce a contrast or exception regarding the levels of something, typically in scientific or analytical contexts.
Example: "Although concentrations of the pollutant were low, the effects on local wildlife were still significant."
Alternatives: "even though levels" or "despite the amounts".
Although concentrations decreased by orders of magnitude as we moved away from the GPGP centre, when considering the outer GPGP (0.1 kg km−2 microplastic contour level, shown in Fig. 3), our model predicted over 100k tonnes of ocean plastics.
Although concentrations of Fe(III) and Mn(IV) mineral phases are high in the aquifer sediment, reductive dissolution is limited, producing only 5% of the observed mass loss.
Although concentrations of aldehydes measured indoors at the participants' homes tracked well with personal exposure, there were instances where personal exposures and indoor concentrations differed significantly.
Although concentrations of Co, Cr, Cu, I, Se and Zn where statistically higher in conventional milk and As in organic, none of these elements by itself was able to discriminate between organic and conventional milk.
Although concentrations of most detected analytes were present at relatively low concentrations, our analysis revealed that overall CEC inputs to each estuary amount to several kilograms of these compounds per day.
No significant differences in pesticide concentrations were observed between species, although concentrations tended to be higher in leopard frogs compared to chorus frogs, possibly because of differences in life histories.
Feeding heated canola products increased milk and milk protein yields in primiparous cows only, but cows of both parities fed diets containing canola presscake produced milk with lower concentrations of C12 0, C14 0, and C16:0 fatty acids than cows fed the canola meal and tallow diets, although concentrations of C18 1 n-9 were unaffected by fat source or level.
Although concentrations of C2-GC are up to four orders of magnitude smaller compared to the concentrations of C1-GC, both components show a similar distribution with depth (Figure 2) and are positively correlated with R = 0.94 (Figure 4).
Both terbuthylazine and hexazinone have been detected in surface waters, and terbuthylazine is the most common herbicide detected in groundwater, although concentrations are currently low (<1 μg L−1) or below drinking water standards (Close & Skinner 2012; Tulagi 2014).
The 2011 SVI shows a more homogeneous spatial distribution of low vulnerability in the northern and central areas, although concentrations of high social vulnerability remain in the southern and northwestern parts of Italy.
Although concentrations of calcium in all the three sites used as the study area were low, they were within the permissible limit for irrigation water as set by DOE (1997) and WHO (1983) which are 3.75 and 10 meq/l, respectively.
