The phrase "a composite sample for" is correct and usable in written English.
It can be used in contexts related to scientific research, environmental studies, or quality control where multiple samples are combined for analysis.
Example: "The researchers collected a composite sample for testing the water quality across different locations in the river."
Alternatives: "a combined sample for" or "a mixed sample for".
The five random samples were homogenized to form a composite sample for each plot.
The five soil samples so obtained were mixed together to prepare a composite sample for that plot and carried to laboratory in a sealed polythene bag.
Four samples were taken from the corners and centre of each quadrat and then mixed in a bucket to form a composite sample for each replication.
A composite sample for pyrosequencing was prepared by pooling 200 ng of these purified PCR products of each sample.
Finally, a composite sample for the entire classroom was collected by conducting 10 consecutive presses at each of the marked locations without changing the C18 disks.
We prepared a composite sample of filtrate for each NP per water type per filtration method by collecting filtrate for 15 sec at 1, 5, 30, 60, 90, and 120 min. Samples were stored at 4°C until ICP-MS analysis.
In addition, a composite sample was collected for each floor surface type by using one press sampler to collect five consecutive samples at the marked locations without changing the C18 disks.
In this study, we describe a sophisticated preparation of an inorganic/organic composite sample for the simultaneous removal of anionic dyes and metal ions, as well as disinfection.
We performed DNA extractions for each subsample in duplicate, and the duplicate extracts were then pooled to form a single composite sample for that site that was stored at –80°C until subsequent molecular analyses.
The absence of peak position shift suggests that the crystal structure is not affected by the addition of HfB2, as expected for a composite sample.
A composite sample was collected each week and examined for the presence of parasite eggs.
