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### AuthorTopic: how to convert %w/v to ppm?  (Read 14476 times) !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="https://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() {var po = document.createElement("script"); po.type = "text/javascript"; po.async = true;po.src = "https://apis.google.com/js/plusone.js";var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(po, s);})();

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#### derek0o0

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##### how to convert %w/v to ppm?
« on: January 17, 2010, 12:49:23 PM »

lets say a sample has a concentration of 0.5%w/v
then how to work it out to ppm?
0.5 divide by million?

thx
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#### Dan

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##### Re: how to convert %w/v to ppm?
« Reply #1 on: January 18, 2010, 03:51:53 AM »

Well, % just means parts per hundred - so how do you think you convert that to parts per million?
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#### JGK

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##### Re: how to convert %w/v to ppm?
« Reply #2 on: January 18, 2010, 06:57:18 AM »

Well, % just means parts per hundred - so how do you think you convert that to parts per million?

Not in this case as its % w/v (it would if it was w/w).

5% is 5g/100 mL ideally you need the density of the solution (g/mL) to calculate a g/g value which you could convert to ppm
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#### mbeychok

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##### Re: how to convert %w/v to ppm?
« Reply #3 on: January 23, 2010, 11:32:42 AM »

A sample of what? A gas or a liquid? It makes a difference.

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