DIBENZO[B,K]CHRYSENE

328.405

328.125214

9825OSH3TH

2902909090

0

8.37

1.3±0.1 g/cm3

400 °C

604.1±22.0 °C at 760 mmHg

314.6±16.4 °C

1.843

In water, 1.48X10-6 mg/L at 25 deg C (est)

1.06X10-13 mm Hg at 25 deg C (est)

Hydroxyl radical reaction rate constant = 5.0X10-11 cu cm/molec-sec at 25 °C (est)

SRP: Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in air, soil or water; effects on animal, aquatic and plant life; and conformance with environmental and public health regulations. If it is possible or reasonable use an alternative chemical product with less inherent propensity for occupational harm/injury/toxicity or environmental contamination.|SRP: Wastewater from contaminant suppression, cleaning of protective clothing/equipment, or contaminated sites should be contained and evaluated for subject chemical or decomposition product concentrations. Concentrations shall be lower than applicable environmental discharge or disposal criteria. Alternatively, pretreatment and/or discharge to a permitted wastewater treatment facility is acceptable only after review by the governing authority and assurance that "pass through" violations will not occur. Due consideration shall be given to remediation worker exposure (inhalation, dermal and ingestion) as well as fate during treatment, transfer and disposal. If it is not practicable to manage the chemical in this fashion, it must be evaluated in accordance with EPA 40 CFR Part 261, specifically Subpart B, in order to determine the appropriate local, state and federal requirements for disposal.

Respirator Recommendations: At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration: /Coal tar pitch volatiles/[Table#3881]|Respirator Recommendations: Escape conditions: /Coal tar pitch volatiles/[Table#3882]

The worker should wash daily at the end of each work shift, and prior to eating, drinking, smoking, etc. /Coal tar pitch volatiles/|Workers whose clothing may have become contaminated should change into uncontaminated clothing before leaving the work premises. /Coal tar pitch volatiles/|SRP: Contaminated protective clothing should be segregated in a manner such that there is no direct personal contact by personnel who handle, dispose, or clean the clothing. The completeness of the cleaning procedures should be considered before the decontaminated protective clothing is returned for reuse by the workers. Contaminated clothing should not be taken home at the end of shift, but should remain at employee's place of work for cleaning.

Permissible Exposure Limit: Table Z-1 8-hr Time Weighted Avg: 0.2 mg/cu m. /Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene/

Recommended Exposure Limit: 10 Hr Time-Weighted Avg: 0.1 mg/cu m (cyclohexane-extractable fraction). /Coal tar pitch volatiles/|NIOSH considers coal tar pitch volatiles to be potential occupational carcinogens. NIOSH usually recommends that occupational exposures to carcinogens be limited to the lowest feasible concentration. /Coal tar pitch volatiles/

IDENTIFICATION AND USE: Dibenzo[b,k]chrysen is unsubstituted polycyclic aromatic hydrocarbon. HUMAN EXPOSURE AND TOXICITY: There are no data available. ANIMAL STUDIES: Dibenzo[b,k]chrysene is not carcinogenic to animals.

Dibenzo(b,k)chrysene is one of many polycyclic aromatic hydrocarbons (PAH), a group of chemicals that are formed during the incomplete burning of coal, oil, gas, wood, garbage, or other organic substances. PAHs generally occur as complex mixtures, for example as part of combustion products such as soot, not as single compounds. PAHs occur naturally in volcanoes and forest fires. They can also be found in substances such as crude oil and coal. They are found throughout the environment in the air, water, and soil(1). /Polycyclic aromatic hydrocarbons/

Dibenzo(b,k)chrysene is one of many polycyclic aromatic hydrocarbons (PAH), a group of chemicals that are formed during the incomplete burning of coal, oil, gas, wood, garbage, or other organic substances. PAHs generally occur as complex mixtures, for example as part of combustion products such as soot, not as single compounds. /Polycyclic aromatic hydrocarbons/

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 2.0X10+7(SRC), determined from a structure estimation method(2), indicates that dibenzo(b,k)chrysene is expected to be immobile in soil(SRC). Volatilization of dibenzo(b,k)chrysene from moist soil surfaces is not expected to be an important fate process(SRC) given an estimated Henry's Law constant of 8.5X10-9 atm-cu m/mole(SRC), using a fragment constant estimation method(3). Dibenzo(b,k)chrysene is not expected to volatilize from dry soil surfaces(SRC) based upon an estimated vapor pressure of 1.1X10-13 mm Hg at 25 °C(SRC), determined from a fragment constant method(2). Biodegradation data in soil were not available(SRC, 2017). In general, polycyclic aromatic hydrocarbons (PAHs) with four or more benzene rings may not biodegrade readily(4).|AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 2.0X10+7(SRC), determined from a structure estimation method(2), indicates that dibenzo(b,k)chrysene is expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is not expected(3) based upon an estimated Henry's Law constant of 8.5X10-9 atm-cu m/mole(SRC), developed using a fragment constant estimation method(4). According to a classification scheme(5), an estimated BCF of 4700(SRC), from an estimated log Kow of 7.87(2) and a regression-derived equation(2), suggests the potential for bioconcentration in aquatic organisms is very high, provided the compound is not metabolized by the organism(SRC). Biodegradation data in water were not available(SRC, 2017). In general, polycyclic aromatic hydrocarbons (PAHs) with four or more benzene rings may not biodegrade readily(6).|ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), dibenzo(b,k)chrysene, which has an estimated vapor pressure of 1.1X10-13 mm Hg at 25 °C(SRC), determined from a fragment constant method(2), is expected to exist solely in the particulate phase in the ambient atmosphere. Particulate-phase dibenzo(b,k)chrysene may be removed from the air by wet and dry deposition(SRC). Dibenzo(b,k)chrysene contains chromophores that absorb at wavelengths >290 nm(4) and, therefore, may be susceptible to direct photolysis by sunlight(SRC).

Dibenzo(b,k)chrysene is not expected to undergo hydrolysis in the environment due to the lack of functional groups that hydrolyze under environmental conditions(1). Dibenzo(b,k)chrysene contains chromophores that absorb at wavelengths >290 nm(1) and, therefore, may be susceptible to direct photolysis by sunlight(SRC).

An estimated BCF of 4700 was calculated in fish for dibenzo(b,k)chrysene(SRC), using an estimated log Kow of 7.87(1) and a regression-derived equation(1). According to a classification scheme(2), this BCF suggests the potential for bioconcentration in aquatic organisms is very high, provided the compound is not metabolized by the organism(SRC). However, bioconcentration studies on compounds which are structurally similar suggest that bioconcentration may be lower than that indicated by the regression-derived equations due to the ability of some aquatic organisms to readily metabolize this polycyclic aromatic hydrocarbons(3).

Using a structure estimation method based on molecular connectivity indices(1), the Koc of dibenzo(b,k)chrysene can be estimated to be 2.0X10+7(SRC). According to a classification scheme(2), this estimated Koc value suggests that dibenzo(b,k)chrysene is expected to be immobile in soil(SRC).

The Henry's Law constant for dibenzo(b,k)chrysene is estimated as 8.5X10-9 atm-cu m/mole(SRC) using a fragment constant estimation method(1). This Henry's Law constant indicates that dibenzo(b,k)chrysene is expected to be essentially nonvolatile from water surfaces(2). Dibenzo(b,k)chrysene is not expected to volatilize from dry soil surfaces(SRC) based upon an estimated vapor pressure of 1.1X10-13 mm Hg(SRC), determined from a fragment constant method(3).

Occupational exposure to dibenzo(b,k)chrysene may occur through inhalation of dust particles contaminated with incomplete combustion products and dermal contact with incomplete combustion products containing dibenzo(b,k)chrysene. The most likely pathway by which the general public is exposed to dibenzo(b,k)chrysene is by inhalation due to the probable release of this substance from combustion smoke. (SRC)

Immediate first aid: Ensure that adequate decontamination has been carried out. If patient is not breathing, start artificial respiration, preferably with a demand-valve resuscitator, bag-valve-mask device, or pocket mask, as trained. Perform CPR if necessary. Immediately flush contaminated eyes with gently flowing water. Do not induce vomiting. If vomiting occurs, lean patient forward or place on left side (head-down position, if possible) to maintain an open airway and prevent aspiration. Keep patient quiet and maintain normal body temperature. Obtain medical attention. /Naphthalene and Related Compounds/|Basic treatment: Establish a patent airway (oropharyngeal or nasopharyngeal airway, if needed). Suction if necessary. Watch for signs of respiratory insufficiency and assist ventilations if necessary. Administer oxygen by nonrebreather mask at 10 to 15 L/min. Monitor for shock and treat if necessary ... . Anticipate seizures and treat if necessary ... . For eye contamination, flush eyes immediately with water. Irrigate each eye continuously with 0.9% saline (NS) during transport ... . Do not use emetics. For ingestion, rinse mouth and administer 5 mL/kg up to 200 mL of water for dilution if the patient can swallow, has a strong gag reflex, and does not drool. Administer activated charcoal ... . /Naphthalene and Related Compounds/|Advanced treatment: Consider orotracheal or nasotracheal intubation for airway control in the patient who is unconscious or is in severe respiratory distress. Start IV administration of 0.9% saline (NS) or lactated Ringer's (LR). Adequate hydration must be maintained to prevent renal failure secondary to myoglobinuria unless signs of cerebral or pulmonary edema are present. For hypotension with signs of hypovolemia, administer fluid cautiously. Watch for signs of fluid overload ... . Administer 1% solution methylene blue if patient is symptomatic with severe hypoxia, cyanosis, and cardiac compromise not responding to oxygen. DIRECT PHYSICIAN ORDER ONLY ... . Treat seizures with diazepam (Valium) or lorazepam (Ativan) ... . Use proparacaine hydrochloride to assist eye irrigation ... . /Naphthalene and Related Compounds/