Hexavalent Chromium ATCM for Decorative and Hard Chrome

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Effective Date: October 24, 2007Appendix 7 – Alternative Requirements for Enclosed Hexavalent ChromiumElectroplating Facilities – Mass Emission Rate Calculation ProcedureMass Emission Rate shall be calculated using the following equation:MAMER = ETSA x K x 0.015 mg/dscmWhere:MAMER = the alternative emission rate for enclosed hexavalent chromiumelectroplating tanks in mg/hr.ETSA = the hexavalent chromium electroplating tank surface area in squarefeet (ft 2 ).K = a conversion factor, 425 dscm/(ft 2 x hr).54
Effective Date: October 24, 2007Appendix 8 – Surface Tension Procedure for a StalagmometerThe stalagmometer must first be properly cleaned before being used for the firsttime and after a period of storage. Properly clean the stalagmometer using thefollowing procedure:1. Set up stalagmometer in stand in a fume hood.2. Place a clean 150 mL beaker underneath the stalagmometer then fillwith reagent grade concentrated nitric acid. Immerse bottom tip(approximately ½”) of stalagmometer into the beaker.3. Squeeze rubber bulb and pinch at the arrow up (1) position to collapse.Place bulb end securely on top end of stalagmometer. Carefully draw thenitric acid by pinching the arrow up (1) position until the level is above thetop etched line.4. Allow nitric acid to remain in stalagmometer for 5 minutes and thencarefully remove the bulb allowing the acid to completely drain.5. Fill a clean 150 mL beaker with distilled or deionized water. Using therubber bulb per the instructions in Step #3, rinse and drain stalagmometerwith deionized or distilled water until the inside is “water break” free.6. Fill a clean 150 mL beaker with isopropyl alcohol. Again using therubber bulb per Step #3, rinse and drain stalagmometer twice withisopropyl alcohol and allow the stalagmometer to dry completely.7. Take a sample of the solution to be tested and adjust the solution toroom temperature. Measure the specific gravity and record reading.8. Fill a clean 150 mL beaker with solution to be tested. Immerse bottomend of stalagmometer into the beaker. Fill the stalagmometer perinstructions in Step #3, making sure that the solution level is above the topetched line.9. Raise the stalagmometer so that the bottom end is completely out ofsolution. Remove bulb and immediately place a finger on the top end ofthe stalagmometer. Carefully use the finger to bring the solution leveldown to the top etched line. Do not release finger at this time.10. “Wipe” the excess solution on the lower tip by touching it against theside of the beaker.11. Release fingertip to allow solution to drain and count number of dropsuntil the level reaches the bottom etched line.55
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Hexavalent Chromium ATCM for Decorative and Hard Chrome

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