Chemistry Question on PPM vs Moles

[outrun]

Molakule,


I am sure this is a nice question. I weasled through inorganic so the quantative math is over my league.

A) Suppose you had a crankcase fill of X qts (or liters) and an oil analysis revealed that you had
Y PPM of Fe present.

Is thier a way you can calculate total grams or moles of Fe present in the full oil drain?

B)When an oil analysis says Chromium or Fe or what not...is it refering to those elements in pure form, ionic, or in compounds (ie chrome-moly, Fe 3+, etc) ?

I have been pondering this question for a while.

Thanks-

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To the Brave Men and Women lost in the shuttle Columbia God be with you-

 

[Al]

It's been a long time for me also. I think that ppm refers to weight in parts per million. So lets say we thave 4 quarts of oil and 50 ppm FE. The weight of the oil is 7.5 lb. 7.5 x .000050 x 454= .17 gram. The weight og Fe is 55.85.

.17/55.85 =.003 moles. That's as good as I can do. Not saying its right

But I'm not Molakule

[ February 01, 2003, 09:52 PM: Message edited by: Al ]

 

[Dominic]

1 PPM = 1mg/L

[ February 01, 2003, 11:21 PM: Message edited by: Dominic ]

 

[WeyounDS9]

quote:

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Originally posted by outrun:
Molakule,

B)When an oil analysis says Chromium or Fe or what not...is it refering to those elements in pure form, ionic, or in compounds (ie chrome-moly, Fe 3+, etc) ?

-[/i]

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A) AI covered this part

B) The most common method used in trace metal analysis is AAS (atomic Absorption Spectroscopy).
The metal atoms are Ionized in this process.
And are detected as individual atoms/ions not molecules.


Fred...