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Comment 17 for Proposed Amendments to the ATCM for Chromium Electroplating and Chromic Acid Anodizing Operations (chromeatcm2023) - 15-1.

First NameNeil
Last NameHammel
Email Addressneil@vcapcd.org
AffiliationVentura County APCD
SubjectCorrection to Surface Tension Calculation using Stalagmometer
Comment
The listed surface tension of water at 25 degrees celcius (72.75
dynes/cm) in now appendix 7 is actually the surface tension of
water at 20 degrees celcius. The correct surface tension of water
at 25 degrees celcius is 71.99 dynes/cm as noted in the
International Tables of the Surface Tension of Water at
https://srd.nist.gov/JPCRD/jpcrd231.pdf and attached. If facilities
use the surface tension calculation as presented in the ATCM, their
results will be skewed higher than reality, resulting in greater
emissions of hexchrome. Thank you.

Attachment https://ww2.arb.ca.gov/sites/default/files/BARCU/barcu-attach/132-chromeatcm2023-UzpdNVciAjRRJQBu.pdf
Original File NameInternational Tables of the Surface Tension of Water.pdf
Date and Time Comment Was Submitted 2023-04-11 12:13:41