Ask a Question
Notify Me On Question Update
Email this Question
Would like to know how many drops in one ounce of water equals how many parts per million? Or quart ect.
Rate This FAQ
Parts Per Million (PPM)
A unit of concentration often used when measuring levels of pollutants in air, water, body fluids, etc. One ppm is 1 part in 1,000,000. The common unit mg/liter is equal to ppm. Four drops of ink in a 55-gallon barrel of water would produce an "ink concentration" of 1 ppm.
Parts Per Billion (PPB)
One part per billion is 1 part in 1,000,000,000. One drop of ink in one of the largest tanker trucks used to haul gasoline would represent 1 ppb.
The difference between 1 ppm and 1 ppb is important. A prestigious scientific journal recently reported the concentration of a substance as 0.5-1.5 ppm. The real value was 0.5-1.5 ppb. The difference between $1 and $1000!
Parts Per Trillion (PPT)
A unit of concentration used to measure vanishingly small levels of pollutants or contaminants in, for example, body fluids. One ppt is 1 part in 1,000,000,000,000. One drop of ink distributed through the water contained in a total of 4 of the 3-million-gallon reservoirs pictured would result in a final concentration of 1 ppt.
The remarkable advances in the sensitivity of modern analytical techniques makes it possible to detect some substances at the ppt level whose presence would not have been detected using earlier assay methods.
Submit Your Suggestion
Other Questions In This Topic
- Does anyone have any idea what a size #2-1/2 can is? I have an old recipe that calls for this size and I am lost! Thanks for your help.
- I am going out of the country for a few years and will be unable to purchase powdered sugar and also tomato paste where I will be living. Is there a way I can make these things myself using very basic products?
- Is it safe to defrost meat on the counter?
- Is it safe to store food in their cans in the refrigerator?
- Can I use a wood cutting board?
- I was wondering how long to cook a 15 lb beef roast in the oven & at what temperature. Do I need to add water? Cover with foil? Any ideas would be greatly appreciated.
- I just prepared chicken and spilled juices on the counter, how do I sanitize the countertop?
- Is it possible to grow blueberries in Utah County? If so, what do I need to do to help them thrive?