"trace substances" is a correct and usable phrase in written English.
It is typically used to refer to very small amounts of a particular substance that may not be easily detectable. Example: "The laboratory was able to detect trace substances of the banned substance in the athlete's blood sample, leading to his disqualification from the competition."
Asphalt aging was shown to be not only affected by the temperature, oxygen content, aging duration, and humidity but also the presence of trace substances in the air.
She is an architect of large-scale mathematical modeling approaches and numerical models to represent the geographic and temporal variations of sources and sinks of CO2, dust and other trace substances around the globe.
Unlike most drugs, the vaccine patient information leaflets list every ingredient used in the vaccine production, including trace substances, so that anyone with a severe allergy to any of these substances is consulted prior to vaccination.
The tiny pores of COFs confer extremely high surface area – approaching that of a football field per gram of the polymer – making them of interest for molecular separations, sensing trace substances, storing chemical fuels or electrical charge, and purifying water, among other potential applications.
Thus a hygienic evaluation is important especially with regard to the analytical proof of "new" trace substances in the Ruhr.
After treatment, the substrates were cleaned with copious amounts of DI water to remove the excess solution and trace substances.
Dimethyltryptamine (DMT), a hallucinogenic compound present in the Amazonian botanical drink ayahuasca, is chemically similar to melatonin and serotonin and is considered to be a trace substance in human blood and urine.
For auxotrophic SMGs, the selection medium should not contain any trace substance that can be synthesized by the SMG, otherwise the medium will lose its selectiveness to the recombinant cells.
Thus, the values in Table 1 can be for instance interpreted as: "how often was substance X detected as a trace substance in the stone samples?".
The GWP of a GHG is defined as the ratio of the time-integrated radiative forcing from the instantaneous release of 1 kg of a trace substance relative to that of 1 kg of a reference gas.
Stools were positive for leukocytes and trace reducing substances.
