The phrase "a third sample was" is correct and usable in written English.
It can be used when referring to the existence or presentation of a third sample in a discussion or report, often in scientific or analytical contexts.
Example: "In our study, a third sample was collected to ensure the accuracy of our results."
Alternatives: "an additional sample was" or "a further sample was".
In some cases, a third sample was obtained from the junction between PDL- and non-PDL-treated areas.
In addition, a third sample was prepared from the positive crude oil (the high micro-dispersion sample) by removing oil compounds associated with micro-dispersion formation.
Two samples made using a steam reformer samples were produced using non-radioactive I and Re (as a surrogate for Tc), while a third sample was produced using actual radioactive tank waste containing Tc and added Re.
Two samples were prepared with a coverage corresponding to that maximum (Au coverage 0.14 0.2 ML, particle size estimated to ∼2 2.5 nm) while a third sample was expected to be less reactive (Au coverage 0.4 ML, particle size estimated to ∼3.3 nm).
A third sample was available for cross-validation and measurement invariance analysis.
If the variance between the two samples was greater than the previously observed maximum uncertainty (15%), a third sample was measured and the average was calculated.
A second sample was obtained with a sampling device and suspended in 20 ml of the PreservCyt Solution (Cytyc/Hologic, Marlborough, MA, USA) for H-HPV DNA testing.
For patients with negative direct smear, a second sample was split, with SOC (raw sputum) and OM-S portions (sediment) tested in the Xpert MTB/RIF (Xpert) assay.
A second sample was obtained after mechanical debridement, decontamination of the implant surface with the test or control substance, and subsequent rinsing with sterile saline (Tpost).
A second sample was taken at the time the index case successfully completed therapy.
