Leo Martínez
Chromium (VI) is used as an anti-corrosive agent in paint and coatings and can be found in pigments, chromium catalysts, dyes, and cements. Exposure to Chromium (VI) can occur through direct contact with a liquid solution or solid powdered chromium-containing compounds, and it can also be inhaled through dust, fumes, or mist. In the context of paint operations, particularly in the aerospace industry, employers must comply with health and safety regulations to maintain employee exposure to Chromium (VI) at or below the permissible exposure limit (PEL) of 5 µg/m3. This limit is set by the Occupational Safety & Health Administration (OSHA) to protect workers from the health risks associated with Chromium (VI) exposure, which can cause respiratory issues, skin allergies, and, in high concentrations, damage to the nose, throat, and lungs. To ensure employee safety, various control measures and protective equipment are implemented, and health monitoring is conducted.
| Characteristics | Values |
|---|---|
| Chromium Type | Hexavalent Chromium (Cr(VI)) |
| Chromium Compound | Chromate (Cr2O3) |
| Chromium Level Limit | 5 micrograms per cubic meter |
| Health Effects | Irritation/Damage to nose, throat, lungs, eyes, and skin; Allergies; Wheezing; Shortness of Breath; Skin Allergies; Chronic Respiratory Irritation; Inflammation; Chronic Bronchitis; Pneumonia; Emphysema |
| Control Measures | Use of HEPA-filtered equipment and vacuums; Ventilated enclosures; Respiratory Protection; Health Monitoring; Skin Checks |
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What You'll Learn
Health risks of chromium exposure
Chromium (VI) is used as an anti-corrosive agent in paint and coatings and can be found in pigments, chromium catalysts, dyes, and cements. It is also released during chrome electroplating, welding, and hot working on stainless steel, high-chrome alloys, or chrome-coated metals. Exposure to chromium can occur through direct contact with a liquid solution or solid powdered chromium-containing compound, as well as through inhalation of dust, fumes, or mist.
The health effects of chromium exposure depend on the oxidation state of chromium, which ranges from chromium II to chromium VI. Chromium VI is toxic to humans and is considered carcinogenic. Exposure to high concentrations of hexavalent chromium can cause skin ulcers and allergic skin reactions, as well as irritation to the lining of the stomach and intestine, and damage to the male reproductive system. Inhalation of hexavalent chromium compounds increases the risk of lung, nasal, and sinus cancer, with the risk increasing with the amount inhaled and the length of exposure. Studies have shown that workers in chromate production, chromate pigment, and chrome electroplating industries employed before the 1980s had increased rates of lung cancer mortality. Direct eye contact with chromic acid or chromate dusts can also cause permanent eye damage.
In addition to cancer, high levels of chromium can irritate or damage the nose, throat, and lungs. Employees may become allergic to chromium, and inhaling chromate compounds can cause wheezing, shortness of breath, and asthma symptoms. Skin allergies may also develop, causing swelling and a long-lasting, itchy rash that becomes more severe with repeated contact. Chromium-induced asthma may occur in some sensitized individuals exposed to elevated concentrations of chromium in the air, although the number of such individuals is low.
Intermediate- to chronic-duration occupational exposure to chromium VI may cause an increased risk of death due to non-cancer respiratory disease. Chronic respiratory irritation, including fluid on the lungs, inflammation, chronic bronchitis, pneumonia, and emphysema, has been observed in workers exposed to chromium VI. In addition, exposure to chromium can cause perforation of the septum (the wall separating the nasal passages), with increased incidences of nasal septum perforation observed in chromium electroplating workers compared to zinc electroplating workers.
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Regulations and standards
In the United States, the Occupational Safety and Health Administration (OSHA) regulates chromium exposure in the workplace. The OSHA Chromium (VI) standard establishes a permissible exposure limit (PEL) for chromium (VI) of 5 µg/m3 (micrograms per cubic meter of air), calculated as an 8-hour time-weighted average. This limit applies to both general industry and construction.
Employers are responsible for ensuring that employees' chromium (VI) exposures remain at or below the PEL. This can be achieved through the use of engineering controls and work practice controls, such as ventilation systems and respiratory protection. If feasible engineering and work practice controls are insufficient to reduce exposures below the PEL, employers must implement additional controls to reduce exposures to the lowest achievable level and supplement them with respiratory protection.
The use of chromate-based paints can significantly contribute to employee exposure to hexavalent chromium (Cr(VI)). Spray painting, in particular, can generate vapors and mists that may contain chromium (VI). To control this hazard, spray booths or rooms with adequate ventilation systems are recommended to capture both vapors and mists.
The OSHA Chromium (VI) standard also applies to specific operations such as paint removal and aircraft or aircraft parts painting. For aircraft painting, OSHA recognizes that feasible controls may not always be adequate to reduce chromium (VI) exposures below the PEL. In such cases, employers must implement engineering and work practice controls to reduce exposures as much as possible and supplement them with respiratory protection.
It is important to note that OSHA requirements are subject to change, and updates may be published on their website or through other official channels. Additionally, other regulatory bodies, such as the Environmental Protection Agency (EPA), may have standards and regulations related to chromium emissions and hazardous air pollutants.
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Engineering and work practice controls
Spray Painting Operations
Spray booths and rooms are commonly used to capture vapours released during spray painting. However, these may not be effective in capturing chromate mist, a by-product of using chromate-based paints. To address this, increasing the air velocity in the spray booths can help capture the chromate mist. Higher velocities of 200 feet per minute (fpm) or more may be required, but this must be balanced with the need to deposit paint on the surface being sprayed. Specially engineered enclosures may be necessary to control Cr(VI) exposure effectively. Additionally, a downdraft or cross-draft exhaust ventilation system can be employed to maintain exposures below the Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (PEL) of 5 micrograms per cubic meter of air (5 µg/m3).
Sanding and Grinding Operations
Sanding and grinding operations during the preparation of parts for chromate painting can expose workers to Cr(VI) if not properly controlled. To mitigate this, the use of handheld powered sanding, cutting, and grinding equipment with attached local exhaust ventilation connected to high-efficiency particulate air (HEPA) filtered exhaust is recommended. Instead of using compressed air to blow dust off parts, HEPA-filtered vacuums or wet methods, such as spray mist, can effectively reduce dust and associated Cr(VI) exposure. For small objects, ventilated and fully enclosed glove box abrasive blasting units can also be utilised to reduce worker exposure.
Respiratory Protection
While not the primary means of protection, respiratory protection can supplement the engineering and work practice controls. Respiratory respirators help minimise the inhalation of Cr(VI) dust, fumes, or mist. However, it is important to recognise that respiratory protection equipment has limitations in terms of usage and effectiveness and should not be solely relied upon.
Health Monitoring
Health monitoring of workers exposed to chromium is crucial. PCBUs, as outlined in the Work Health and Safety Regulation 2017, are responsible for providing health monitoring when there is a significant risk to workers' health due to chromium exposure. This includes weekly skin checks by trained personnel and ensuring access to medical practitioners experienced in health monitoring. Records of health monitoring must be maintained for 30 years.
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Respiratory protection
Hexavalent chromium (or Chromium VI) is a highly toxic substance that can cause severe health issues, including respiratory problems, skin irritation, and even lung cancer. Occupational exposure to hexavalent chromium is a serious concern, especially during painting operations. To protect workers' respiratory health during abatement procedures, several measures can be implemented.
Firstly, it is crucial to understand the sources of chromium exposure. During painting operations, hexavalent chromium exposure can occur through the inhalation of dust, fumes, or mist generated during the painting process. Prepping parts for chromate painting, such as sanding and grinding, can create significant chromium exposure if not properly controlled. Therefore, implementing proper ventilation and exhaust systems is essential. Spray booths or rooms with adequate airflow and downdraft or cross-draft exhaust ventilation systems can help capture vapors and mists, reducing the risk of inhalation.
Personal protective equipment (PPE), including respiratory protection, plays a crucial role in safeguarding workers. Respiratory protection devices, such as respirators, can supplement ventilation controls by providing an additional barrier against chromium inhalation. However, it is important to recognize that respiratory protection equipment has limitations in terms of usage and effectiveness. Proper selection, fitting, use, and maintenance of respirators are vital to ensure their effectiveness in minimizing chromium exposure.
To ensure the effectiveness of respiratory protection, a comprehensive respiratory protection program should be established. This program should include training workers on the proper use and care of respirators, as well as providing medical evaluations to ensure workers can use respirators safely. Additionally, the program should outline procedures for regular inspection, cleaning, and maintenance of the respirators to maintain their integrity.
In certain situations, such as in large facilities or aircraft hangars, specialized engineering controls may be required to manage chromium exposure effectively. In these cases, consultation with industrial hygiene experts and adherence to guidelines set by regulatory bodies like the Occupational Safety and Health Administration (OSHA) and the National Institute for Occupational Safety and Health (NIOSH) are crucial. These regulatory bodies provide standards and recommendations for ventilation requirements, exposure limits, and the use of respiratory protection to ensure worker safety.
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Health monitoring
Hexavalent chromium (Cr(VI)) is a highly toxic substance that can cause serious health issues, including lung cancer. It is hazardous when inhaled or ingested and can also cause skin and eye irritation, as well as damage to the nose, throat, and lungs. Due to these risks, health monitoring is crucial when working with or around chromium-containing paint.
Firstly, it is essential to establish safe work practices and provide comprehensive training to employees. This includes educating workers on the dangers of Cr(VI) exposure, as well as implementing measures to minimize exposure, such as using local exhaust ventilation systems, wearing protective clothing and equipment, and following proper emergency procedures.
Regular air monitoring is necessary to comply with health and safety regulations. Employers must provide opportunities for employees or their representatives to observe any monitoring of Cr(VI) exposure. This monitoring data should reflect workplace conditions, including processes, materials used, control methods, work practices, and environmental conditions. Historical monitoring data from before May 30, 2006, can also be referenced to understand previous exposure levels.
In the event of an emergency, such as an uncontrolled release of Cr(VI), immediate action must be taken to control and contain the release. If the release can be controlled by employees or maintenance personnel, it is not considered an emergency. However, all personnel should be trained to handle such situations appropriately.
To ensure the health and safety of employees, regular health check-ups may be necessary to monitor for any adverse effects of Cr(VI) exposure. This can include measuring chromium concentrations in whole blood, plasma, serum, or urine to detect early signs of toxicity. It is also important to note that employees may develop allergies to Cr(VI) over time, leading to respiratory issues and skin allergies. Therefore, ongoing health monitoring is crucial to identify any changes in an individual's health status.
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Frequently asked questions
The Occupational Safety & Health Administration (OSHA) established a PEL for chromium (VI) of 5 µg/m3 (micrograms per cubic meter of air).
Exposure to chromium (VI) in paint can cause chronic respiratory irritation, including fluid on the lungs, inflammation, chronic bronchitis, pneumonia, and emphysema. It can also irritate or damage the nose, throat, eyes, and skin. Inhaling chromate compounds can cause wheezing and shortness of breath, and skin allergies may develop, causing swelling and a long-lasting itchy rash.
Employers must use engineering and work practice controls to maintain employees' chromium (VI) exposures at or below the PEL. If these controls are not sufficient to reduce exposures, employers must use them to reduce exposures to the lowest achievable levels and then supplement them with respiratory protection. Other procedures include using HEPA-filtered vacuums or wet methods instead of compressed air to reduce dust, and using ventilated and fully enclosed glove box abrasive blasting units for small objects.
