The phrase "average concentration at" is correct and usable in written English.
It can be used in scientific or analytical contexts when discussing the typical level of a substance in a given location or condition.
Example: "The average concentration at the sampling site was measured to be 5 mg/L."
Alternatives: "mean concentration in" or "typical concentration at".
Meanwhile, the uncontrolled distillation had average concentration at 36.35 vol.% of ethanol, 17.33% of yield, for 119 min. However, the efficiency of fermented medium distillation was a smaller higher than distillation of diluted ethanol.
The average radium concentration in estuary areas lined with mangroves was 2.5 times higher than the average concentration at the mouth of the estuary and 6.5-fold higher than upstream freshwater areas.
Overall, the BTCs of individual NPFCs, PFCs and of field average concentration at the two sites were better reproduced with parameters obtained from CXTFIT than by the moment method.
From these, we inferred the average concentration at these 7 sections over a time interval of 360 s.
For each pollutant, the excess risk of mortality with the 95% confidence interval (CI) per 10-μg/m increase in average concentration at lag 0 1 was calculated.
The AirGIS system calculates air pollution hour by hour, which was summarized as the yearly average concentration at each residential address.
The present standard, expressed in terms of average concentrations at ground level, is 84 parts per billion; Mr. Johnson would lower that to 75, while the advisory panel recommended 60 to 70 parts per billion.
Under the traffic force (not open fan), the CO and NO average concentrations at the main tunnel outlet were 20.3 ppm and 1.65 ppm, respectively.
For CYFRA21-1 a moderate increase of average concentrations at T3 is seen and CEA shows a weak but systematic decrease.
We developed regression models to relate the annual average concentrations at the 40 monitoring sites with the geographic variables.
We took average concentrations at steady state as the average concentration over one dosing interval after the system reached steady state.
