Question about sulfides and AWWA C-105 ? 2

[Arizona3106]

A local material supplier wanted information on corrosivity of his select and base course materials to provide to clients.

We had the following tests run to check for iron pipe corrosivity: pH, resistivity, sulfates, chlorides, sulfides, & REDOX.

I'm not sure how to interpret the Sulfides. AWWA C-105 Appendix A and ASTM A888 Appendix X1 discuss determining iron corrosion using a 10 point scale.

For this scale, sulfides are classified as Positive, Trace, or Negative using a sodium azide-iodine qualitative test. I have been provided a mg/L quantitative amount. Therefore, I don't know what standard to use for metal pipe corrosion, if not the AWWA C-105 standard or ASTM?

Any recommended standards for corrosivity to other materials, like concrete? Thanks for any info you can provide.

 

[Ron]

I know of no correlation between the two different tests. Run the sodium azide test.

As for concrete, consult the table in ACI 201.2R for aggressive chemical attack on concrete.

 

[Arizona3106]

Thank you Ron. So, are the attached test results kind of useless for determining corrosivity?

It seems Caltrans and ACI use ppm for sulfates and chlorides. I have no idea how to translate the mg/L provided to me. Or the previously mentioned sulfides in mg/L.

 

[bimr]

Perhaps this book may help:

http://books.google.com/books?id=hY...+sulfates+and+chlorides&source=gbs_navlinks_s

External corrosion and corrosion control of buried water mains
by Andrew E Romer; Graham E C Bell; Steven J Duranceau; Scot Foreman; AWWA Research Foundation.

You can find the book in a library with worldcat

http://www.worldcat.org/title/exter...d-water-mains/oclc/57349195?pgload=backtoitem

If you are asking to convert mg/l:

ppm = (mass of substance/mass of solvent) x 1,000,000 which means one part per million is 1g of substance in 1,000,000 grams of solvent as water has a density of 1g per ml we can say 1 ppm = 1 mg/L

http://www.engineeringtoolbox.com/ppm-d_1039.html