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The phrase "sum of the concentrations" is grammatically correct and can be used in written English
It is typically used in scientific or mathematical contexts to describe the total amount or quantity of something. Example: The sum of the concentrations of carbon dioxide and methane in the atmosphere is a key factor in predicting global climate change.
Exact(33)
However, it was found that a polarity index, calculated as the sum of the concentrations of hydroxyl and amine moieties weighted by their individual cohesive energy density, was a good predictor of oxygen permeability for all types of formulations.
Evidently, the sum of the concentrations of the intermediate and the proposed final product (pyridine) for each cigarette was greater than the original concentration of nicotine evolved by each cigarette.
The highest concentration of metazachlor allowed in the groundwater and drinking water is therefore 0.1 µg/L and the sum of the concentrations of all pesticides must not exceed 0.5 µg/L.
Its essence lies in finding the ratio of stoichiometric coefficients in the formula M n L k according the dependence, constructed in coordinates "absorbance − concentration ratio of one component to the sum of the concentrations of the two components" (A − c(M 2+) / (c(M 2+) + c(L)) or (A − c(L) / (c(M 2+) + c(L)).
The percentage of the primary species was determined based on the ratio of sum of the concentrations of chloride, sodium, potassium, calcium and magnesium to the total ionic concentration of aerosol whereas ammonium, nitrate and sulphate were used for the determination of percentage of secondary species in a similar way.
The sum of the concentrations of iAs, MAs, and DMAs in urine was reported as tAs.
Similar(27)
The sum of the concentration of MYB28 and MYB29 quantitatively determines the level of aliphatic glucosinolates, both accounting for about 50% of this level.
The results are given as the sum of the concentration of all identified linear and branched isomers.
In addition, solutions containing different proportions of GFP-MTase and 21TH21B, where the sum of the concentration of the two components was 200 nM, were prepared.
We further demonstrate increased CCL2 levels in FC/ASM co-culture beyond the sum of the concentration of CCL2 released from each cell type in monoculture.
By definition, cumulative TCPy was the sum of the concentration at each time point multiplied by the duration between time points.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com