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Depending on the pathogen and antibiotics being tested, the media can be changed and/or adjusted. The antimicrobial concentration is adjusted into the correct concentration by mixing stock antimicrobial with media. The adjusted antimicrobial is serially diluted into multiple tubes (or wells) to obtain a gradient. The dilution rate can be ...
A drinking water standard of 0.05 mg/L (equal to 50 parts per billion, or ppb) arsenic was originally established in the United States by the Public Health Service in 1942. After the passage of the Safe Drinking Water Act of 1974 (SDWA), the Environmental Protection Agency (EPA) was given the power to set the maximum contaminant levels (MCLs ...
For instance, a change in an interest rate from 5.15% per annum to 5.35% per annum could be denoted as a change of 20 basis points (per annum). As with interest rates, the words "per annum" (or "per year") are often omitted. In that case, the basis point is a quantity with a dimension of (time −1). [2]
It is commonly expressed in mass of oxygen consumed over volume of solution, which in SI units is milligrams per liter (mg/L). A COD test can be used to quickly quantify the amount of organics in water. The most common application of COD is in quantifying the amount of oxidizable pollutants found in surface water (e.g. lakes and rivers) or ...
Hypereutrophic lakes have a visibility depth of less than 3 feet (90 cm), they have greater than 40 micrograms/litre total chlorophyll and greater than 100 micrograms/litre phosphorus. The excessive algal blooms can also significantly reduce oxygen levels and prevent life from functioning at lower depths creating dead zones beneath the surface.
The iron concentration ranged from less than 20 micrograms per liter (2.0 × 10 −5 oz/cu ft) to 1,460 micrograms per liter (0.00146 oz/cu ft). The sulfate and chloride concentrations ranged from 8 to 16 milligrams per liter (0.0080 to 0.0160 oz/cu ft) and 4 to 11 milligrams per liter (0.0040 to 0.0110 oz/cu ft), respectively.
The concentration of sodium was 7.8 milligrams per liter (0.0078 oz/cu ft), while the phosphorus concentration was 60 micrograms per liter (6.0 × 10 −5 oz/cu ft) and the chloride concentration was 11 milligrams per liter (0.011 oz/cu ft).
The concentration of recoverable manganese ranged from less than 2 micrograms per liter (2.0 × 10 −6 oz/cu ft) to 50 micrograms per liter (5.0 × 10 −5 oz/cu ft) all the times the concentration was quantified, while the recoverable iron concentration ranged from less than 10 micrograms per liter (1.00 × 10 −5 oz/cu ft) to 1,230 ...