Assertion: hydrogen sulfide's concentration | /r/AtLocation | longer test of 105 days
Facets:
value: to be below 2 ppb
type: PURPOSE
Source sentences:
text: For example, the LC 50 for Gammarus pseudolimnaeus after 96 hours of exposure was 22 ppb, but in a longer test of 105 days, the concentration needed to be below 2 ppb to ensure survival.