According to the study, 50 to 60 million Pakistanis use groundwater which very likely contains more than 50 micrograms per liter
In the lab, the researchers placed young perch in tanks for seven days with either no oxazepam or with the drug at one of two concentrations: 1.8 micrograms per liter
or 910 micrograms per liter
One study concluded that aluminum in drinking water above 100 micrograms per liter
may be a risk factor for dementia and Alzheimer's disease.
It has a broad measuring range of approximately 0.05 to 300 micrograms per liter
(1.06 mlU/L to 6,360 mlU/L).
The median level of perchlorate in urine in CDC's study was just 2.9 micrograms per liter
(a microgram per liter is equal to 1 ppb).
Further investigation has revealed that about 30 percent of wells in Bangladesh contain arsenic levels of more than 50 micrograms per liter
([micro]g/L) of water, and 5 to 10 percent of the country's wells test at levels of more than 300 micrograms per liter
In one of the five test sites, GBI said MTBE concentrations were reduced from 544,000 to 14,000 micrograms per liter
(?g/L) in nine months and from 36,000 to 3,000 ?g/L in 15 months.
The average perchlorate concentration in breast milk was 10.5 micrograms per liter
; in dairy milk, 2.0.
For example, all mothers have traces of aluminum in their breast milk (about 40 micrograms per liter
"Concentrations may reach hundreds of micrograms per liter
in one well--which is enough to make people very sick--but fall below detection limits in a nearby well."
Environmental Protection Agency, the New Hampshire Department of Health and Human Services and Department of Environmental Services, and the New Hampshire Estuaries Project, concluded that 20 percent of the homes across Hillsborough, Rockingham, and Strafford counties are using private wells with arsenic concentrations above 10 micrograms per liter
. That is the state and federal standard, effective this month.