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Keep the lid on the jar to keep contaminants out.
Beware of bargains, as cutting corners to keep costs low may mean the introduction of some nasty contaminant you definitely don't want.
Results from the site investigations indicated that contaminant plumes existed within part of the site.
Common sorrel seed has occurred as a contaminant of grass seed mixtures, crop seeds and in hay.
Advice should have been obtained on how much contaminant might suffice to infect.
In general, contaminant inputs have declined and elevated concentrations are often a legacy of former industrial discharges.