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Author Topic: help converting metal ion counts  (Read 4768 times)

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Catalina

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help converting metal ion counts
« on: September 01, 2009, 01:39:02 AM »
Can anyone help me with how to convert parts per billion (ppb) to/from mcg/l or ng/ml?


stevel

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Re: help converting metal ion counts
« Reply #1 on: September 01, 2009, 07:01:42 AM »
A liter of water weighs 1 kilogram (kg) at 4 degrees Centigrade at a standard atmospheric pressure of 760 mm mercury.  A microgram (ug or mcg) is 1 millionth of a gram.  A kilogram (kg) is 1000 grams.  So 1 mcg/liter or 1 mcg/1kg or 1 mcg/1000g or 1/1,000,000 g/1000g = 1/1,000,000,000 or ppb or parts per billion.  So mcg/l = ppb = parts per billion.

A nanogram is 1 billionth of a gram.  A milliliter is 1 thousandth of a liter or 1/1000 kilogram of water or 1 gram.  So 1 ng/ml or 1 ng/g = ppb = parts per billion.

These samples must be reported as a solution of water (rather than a solution of alcohol or some other medium) for the conversion to be valid.
Steve
LBHR 60mm/54mm Dr Su 9/29/08 age 55
RBHR 60mm/54mm Dr Su 11/1/19 age 66

Catalina

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Re: help converting metal ion counts
« Reply #2 on: September 08, 2009, 05:08:27 AM »
So, what you are saying is that they are used interchangably?

stevel

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Re: help converting metal ion counts
« Reply #3 on: September 08, 2009, 05:52:13 AM »
Yes
Steve
LBHR 60mm/54mm Dr Su 9/29/08 age 55
RBHR 60mm/54mm Dr Su 11/1/19 age 66

 

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