Convert weight percentage (EDX) into ppm

February 22, 2009

A SEM/EDX analysis on Aluminium bond pad (AlCu0.5%) detected 2% weight percentage of Chlorine, besides common elements Al, C, O & Ti. May I know how to convert this Chlorine weight percentage into ppm ?

Liew CS
Employee - Malaysia

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First of three simultaneous responses -- February 25, 2009

2% would be 20,000 ppm

Terry Tomt
- Auburn, Washington

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Second of three simultaneous responses -- February 25, 2009

The easy answer is .0001% = 1 ppm.

Kurt Sammons
- Inman, South Carolina

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Third of three simultaneous responses -- February 25, 2009

2% is 2 parts per hundred, so I would guess that you need to multiply that by 10,000 to get parts per million.
PS, I rather doubt that number unless it has salt on the surface or had a chlorinated plastic residue.

James Watts
- Navarre, Florida

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March 1, 2009

Remember that EDX is an analysis of the surface only and may not represent the overall composition of the target.
The conversion appears simple but I would be very careful what conclusions I reached from the figures.

Geoff Smith Hampshire, England

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August 14, 2009

I have been analysing bark samples for chlorine content and have been able to achieve chlorine as a weight percentage. does anyone know how to convert from weight percentage to ppm?

Denis Delaney
- Wexford, Ireland

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August 14, 2009

Hi, Denis. The previous answers seemed to explain it, but I guess it wasn't as clear as I thought. 'ppm' is parts per million by weight. 1 percent by weight would be 10,000 ppm

Regards,

Ted Mooney, P.E. RET finishing.com Brick, New Jersey

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December 2, 2009

A SEM/EDX analysis on Mold compound (SiO2 -80%) detected 0.33% weight percentage of Bromine, besides common elements Mg,Si, Zn, C , O.

May I know how to convert this Bromine weight percentage into ppm ?

Hiew Mei Fen
student - Malaysia

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December 2, 2009

Hi, Hiew. As mentioned, the meaning of "ppm" is simply "parts per million by weight". You have 3.3 parts per thousand by weight, which would be 3300 ppm. I am having a hard time understanding why you would ask this question in light of the previous question that was rather clearly answered four times :-)

Please read Geoff Smith's caution.

Regards,

Ted Mooney, P.E. RET finishing.com Brick, New Jersey