Ted Mooney, P.E. RET
- Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Converting part per million to ounces per gallon for a dilute chromate seal
I am doing analysis on a Dilute Chromate Seal for a chromic anodize line, my question is I am checking for Hexavalent chrome on this bath but the procedure I have gives me the results in PPM, now if I have a low result I need to add chromic acid to raise it into spec, the chromic I am using is in flake form (solid) so I need to figure out how many ounces per gallon of chromic to raise to the hex chrome 1 PPM, any input would be greatly appreciated.
Stephen Clarkquality control tech. - Weatherford, Texas, US
December 12, 2008
First of three simultaneous responses --
one ppm is the same as 1 milligram per liter.
Don Baudrand
Consultant - Poulsbo, Washington
(Don is co-author of "Plating on Plastics" [on Amazon or AbeBooks affil links]
and "Plating ABS Plastics" [on Amazon or eBay or AbeBooks affil links])
December 17, 2008
Second of three simultaneous responses --
Stephen
Try entering the phrase "convert PPM to oz/gal" in a search engine. It should take you where you want to be.
- Colorado Springs, Colorado
December 17, 2008
Third of three simultaneous responses --
1 ppm = 1 mg/L.
1000 mg/L = 1 gm/L
gm/L divided by 7.5 = av oz per gallon
0.001 grams divided by 7.5 = 0.00013333333 av oz/gal
Robert H Probert
Robert H Probert Technical Services
Garner, North Carolina
December 17, 2008
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