Occupational Exposure to Hexavalent Chromium | NIOSH | CDC
2014年6月6日 · DHHS (NIOSH) Publication Number 2013-128. In this criteria document, the National Institute for Occupational Safety and Health (NIOSH) reviews the critical health effects studies of hexavalent chromium (Cr [VI]) compounds in order to update its assessment of the potential health effects of occupational exposure to Cr (VI) compounds and its ...
Hexavalent Chromium [NIOSH 1975a, 2005a]. Cr(VI) compounds include a large group of chemicals with varying chemical properties, uses, and workplace exposures. Their properties include corrosion-resistance, durability, and hardness. So-dium dichromate is the most common chromium chemical from which other Cr(VI) compounds may be produced.
hexavalent chromium may be lost owing to reaction with the PVC filter. An indication that hexavalent chromium has been lost in this manner is a brown-colored PVC filter. b. Cool the solution and transfer it quantitatively with distilled water rinses to a 25-mL volumetric flask, keeping the total volume about 20 mL.
CDC - NIOSH Pocket Guide to Chemical Hazards - Chromium metal
Respirator Recommendations. NIOSH. Up to 2.5 mg/m3: (APF = 5) Any quarter-mask respirator. Click here for information on selection of N, R, or P filters.*. Up to 5 mg/m3: (APF = 10) Any particulate respirator equipped with an N95, R95, or P95 filter (including N95, R95, and P95 filtering facepieces) except quarter-mask respirators.
Engineering Controls Database - Control of Hexavalent Chromium …
Hexavalent chromium (Cr (VI)) compounds are a group of chemical substances that contain the metallic element chromium in its positive-6 valence (hexavalent) state. Occupational exposures to Cr (VI) occur during the production of stainless steel, chromate chemicals, and chromate pigments. Cr (VI) exposures also occur during other work activities ...
High concentration of hexavalent chromium can be assessed visually by its orange color. NOTE 2: For samples having low hexavalent chromium concentration, additional 3 mL to 5 mL aliquots of ultrasonicated sample solution can be loaded onto SPE cartridges (step 8.a). In this manner, the cartridge can be used to preconcentrate hexavalent chromium. c.
Docket 144: Occupational Exposure to Hexavalent Chromium - CDC
2012年12月18日 · NIOSH Docket Number 144. NIOSH published a final document, Criteria for a Recommended Standard: Occupational Exposure to Hexavalent Chromium, in January 2013. The final document and the NIOSH responses to the peer and stakeholder and public review comments are provided below. Previously, a public meeting was held in January 2009 at the …
for chromium, hexavalent chromium, cadmium, and isocyanates; and did a more detailed evaluation of the ventilation systems. We collected urine and blood samples to test for cadmium, chromium (urine only), and isocyanates. We did nasal examinations to look for ulcerations, irritation, scarring, and perforations related to chromium exposure.
Dilute 1000 μg/mL hexavalent chromium standard 1:100 with deionized water. Basic extraction solution. Dissolve 20 g sodium hydroxide and 30 g sodium carbonate in deionized water to make 1 L of solution. Glassware cleaning solution.*. Add a volume of concentrated nitric acid to an equal volume of deionized water.
constituents. An indication that hexavalent chromium has been lost in this manner is a br own-colored PVC filter. NOTE: A hot plate, heater block, or ultrasonic bath can also be used for this step [9, 11]. a. Cool the solution and transfer it quantitatively with distilled water rinses to a 25-mL v olumetr ic flask. Bring to volume with ...