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McClure, Kirk; Tino, Richard; Condit, Celeste M.; Mino, Mary

doi:10.1080/01463379409369927

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“…In the San Francisco Bay Area, allowable emissions range between 0.006-0.15 mg/amp-hour, depending on the amount of plating activity. 1 Large plating operations that produce greater amounts of chromium metal per year are typically regulated at the most stringent levels.…”

Section: Discussionmentioning

confidence: 99%

Size and Concentration Measurements of Particles Produced in Commercial Chromium Plating Processes

Bonin

Flower

Renzi

et al. 1995

Journal of the Air & Waste Management Association

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Optical measurements of particle size and concentration were made at the chromium plating tank and exhaust system at a commercial hexavalent chromium plating facility. Particles were examined at three locations in the exhaust system: 1) directly at the hexavalent chromium plating bath surface, 2) at the exit of a cyclone separator located in the exhaust system approximately three to four meters downstream of the bath, and 3) in the exhaust stack, downstream of the induced draft fan and all abatement devices. Particle diameters at the bath surface ranged from 0.3 to 25 |im. Downstream of the cyclone exit and mesh pad filters, particle top sizes were approximately 5 and 0.7 mm, respectively. On a mass basis, the collection efficiency of all abatement devices was 99.997%. Assuming that droplets in the flow consist primarily of water and chromium, correcting the total particle mass flow against water content gives a chromium emission rate of 64,000 ng/hr, which compares favorably with a value of 77,000 ng/hr measured with EPA methods. This initial agreement, which should be validated through additional measurements over a broad range of flow conditions, raises the possibility of continuous monitoring for chromium metal emissions using particle size/mass as a surrogate.

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Section: Discussionmentioning

confidence: 99%