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A related concept is one part per ten thousand, 1 / 10,000 .The same unit is also (rarely) called a permyriad, literally meaning "for (every) myriad (ten thousand)". [4] [5] If used interchangeably with basis point, the permyriad is potentially confusing because an increase of one basis point to a 10 basis point value is generally understood to mean an increase to 11 basis points; not ...
Methylisothiazolinone, at 100 ppm (0.01%) in cosmetic products is causing contact allergy and allergic contact dermatitis in the consumer. Benzisothiazolinone is known to be a sensitiser in man and has induced sensitisation at circa 20 ppm in gloves." [10]
A percentage point or percent point is the unit for the arithmetic difference between two percentages.For example, moving up from 40 percent to 44 percent is an increase of 4 percentage points (although it is a 10-percent increase in the quantity being measured, if the total amount remains the same). [1]
The analyzed samples contain less than 10% impurities (Y, Al, Mn, Cr, Nb and other rare-earth element) and up to 0.01% (100 ppm) of uranium. [26] Presence of a significant amount of uranium allowed scientists to estimate the age of tranquillityite and some associated minerals in Apollo 11 samples as 3710 million years using the uranium–lead ...
The total area of the 1 ppm CH 2 peak will be twice that of the 2.5 ppm CH peak. The CH 2 peak will be split into a doublet by the CH peak—with one peak at 1 ppm + 3.5 Hz and one at 1 ppm − 3.5 Hz (total splitting or coupling constant is 7 Hz). In consequence the CH peak at 2.5 ppm will be split twice by each proton from the CH 2. The first ...
0.1 ppm Natural atmosphere level [71] 0.5 to 5 ppm Average level in homes [72] 5 to 15 ppm Near properly adjusted gas stoves in homes [72] 100 to 200 ppm Exhaust from automobiles in the Mexico City central area [73] 5,000 ppm Exhaust from a home wood fire [74] 7,000 ppm Undiluted warm car exhaust without a catalytic converter [74] 30,000 ppm
Fresh water can be defined as water with less than 500 parts per million (ppm) of dissolved salts. [ 6 ] Other sources give higher upper salinity limits for fresh water, e.g. 1,000 ppm [ 7 ] or 3,000 ppm.
Data from human exposure to 1,2-dichlorobenzene shows that concentrations of 100 ppm have been reported to cause sporadic irritation of the eyes and respiratory tract. [8] The Occupational Safety and Health Administration and the National Institute for Occupational Safety and Health have set occupational exposure limits at a ceiling of 50 ppm ...