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Perchloromethyl Mercaptan Analysis Essay

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Chemical Datasheet


Chemical Identifiers | Hazards | Response Recommendations | Physical Properties | Regulatory Information | Alternate Chemical Names

Chemical Identifiers

CAS NumberUN/NA NumberDOT Hazard LabelUSCG CHRIS Code
  • 594-42-3  

NFPA 704

data unavailable

General Description

A yellow oily liquid with an offensive odor. Insoluble in water. Density 1.72 g / cm3. Hence sinks in water. Nonflammable but supports combustion. Very toxic by inhalation or skin absorption.


Reactivity Alerts


Air & Water Reactions

Insoluble in water. Slowly decomposed by moisture in the air. Reacts with hot water to give carbon dioxide, hydrochloric acid and sulfur.

Fire Hazard

Very irritating vapors formed from hot material; may form phosgene gas, hydrogen chloride, and sulfur dioxide. At high temperatures this compound will decompose to carbon tetrachloride, sulfur chloride, heavy oil polymers, phosgene gas, hydrogen chloride, and sulfur dioxide. Reacts with iron or steel, evolving carbon tetrachloride. Corrosive to most metals. Reacts with water only when hot to give carbon dioxide, hydrochloric acid, and sulfur. Hazardous polymerization may not occur. (EPA, 1998)

Health Hazard

May cause death or permanent injury after short exposure to small quantities, strong irritant to eyes and skin. Inhalation may cause severe irritation of the upper respiratory tract. It also is a strong irritant to the eyes and skin. Brief exposure to lower concentrations may produce central nervous system depression and lung, liver, and heart congestion. Severe exposures may be fatal. Exposure of eyes may lead to severe conjunctivitis or corneal damage. The liquid is irritating to the skin, and may be absorbed through the skin in quantities sufficient to cause general toxic effects. Ingestion may cause damage to mucous membranes and result in pain and burning of the mouth and throat, nausea, vomiting, cramps, and diarrhea. In severe cases, tissue ulceration and CNS depression may occur. (EPA, 1998)

Reactivity Profile

PERCHLOROMETHYL MERCAPTAN is incompatible with acids, diazo and azo compounds, halocarbons, isocyanates, aldehydes, alkali metals, nitrides, hydrides, and other strong reducing agents. Reactions with these materials generate heat and in many cases hydrogen gas. Reacts readily with oxidizing agents.

Belongs to the Following Reactive Group(s)

Potentially Incompatible Absorbents

Use caution: Liquids with this reactive group classification have been known to react with the absorbents listed below. More info about absorbents, including situations to watch out for...

  • Cellulose-Based Absorbents
  • Mineral-Based & Clay-Based Absorbents
  • Dirt/Earth

Response Recommendations

Isolation and Evacuation

Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:

As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids.

SPILL: See ERG Table 1 - Initial Isolation and Protective Action Distances on the UN/NA 1670 datasheet.

FIRE: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2016)


Fight fire from maximum distance. Dike fire control water for later disposal; do not scatter the material. Positive pressure breathing apparatus and special protective clothing should be worn.

This compound is neither flammable nor a serious fire hazard, although it will support combustion. Fight small fires with dry chemical, carbon dioxide, water spray, or foam, and large fires with water spray, fog, or foam. Move containers containing this compound away from fire area if possible. (EPA, 1998)

Non-Fire Response

Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:

ELIMINATE all ignition sources (no smoking, flares, sparks or flames in immediate area). All equipment used when handling the product must be grounded. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. A vapor-suppressing foam may be used to reduce vapors. DO NOT GET WATER INSIDE CONTAINERS. Use water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled material. Prevent entry into waterways, sewers, basements or confined areas.

SMALL SPILL: Cover with DRY earth, DRY sand or other non-combustible material followed with plastic sheet to minimize spreading or contact with rain. Use clean, non-sparking tools to collect material and place it into loosely covered plastic containers for later disposal. (ERG, 2016)

Protective Clothing

Skin: Wear appropriate personal protective clothing to prevent skin contact.

Eyes: Wear appropriate eye protection to prevent eye contact.

Wash skin: The worker should immediately wash the skin when it becomes contaminated.

Remove: Work clothing that becomes wet or significantly contaminated should be removed and replaced.

Change: No recommendation is made specifying the need for the worker to change clothing after the work shift. (NIOSH, 2016)

DuPont Tychem® Suit Fabrics

No information available.

First Aid

Signs and Symptoms of Acute Perchloromethylmercaptan Exposure: Signs and symptoms of acute exposure to perchloromethylmercaptan may lead to liver, heart, and kidney damage. Respiratory effects include coughing, dyspnea (shortness of breath), painful breathing, and lung congestion. Tachycardia (rapid heart rate) is often observed. Nausea, vomiting, abdominal cramping, and diarrhea may also occur. Contact with perchloromethylmercaptan may result in severe dermatitis (red, inflamed skin), conjunctivitis (red, inflamed eyes), and burns with ulceration and severe pain.

Emergency Life-Support Procedures: Acute exposure to perchloromethylmercaptan may require decontamination and life support for the victims. Emergency personnel should wear protective clothing appropriate to the type and degree of contamination. Air-purifying or supplied-air respiratory equipment should also be worn, as necessary. Rescue vehicles should carry supplies such as plastic sheeting and disposable plastic bags to assist in preventing spread of contamination.

Inhalation Exposure:
1. Move victims to fresh air. Emergency personnel should avoid self-exposure to perchloromethylmercaptan.
2. Evaluate vital signs including pulse and respiratory rate, and note any trauma. If no pulse is detected, provide CPR. If not breathing, provide artificial respiration. If breathing is labored, administer oxygen or other respiratory support.
3. Obtain authorization and/or further instructions from the local hospital for administration of an antidote or performance of other invasive procedures.
4. Transport to a health care facility.

Dermal/Eye Exposure:
1. Remove victims from exposure. Emergency personnel should avoid self- exposure to perchloromethylmercaptan.
2. Evaluate vital signs including pulse and respiratory rate, and note any trauma. If no pulse is detected, provide CPR. If not breathing, provide artificial respiration. If breathing is labored, administer oxygen or other respiratory support.
3. Remove contaminated clothing as soon as possible.
4. If eye exposure has occurred, eyes must be flushed with lukewarm water for at least 15 minutes.
5. THOROUGHLY wash exposed skin areas with soap and water.
6. Obtain authorization and/or further instructions from the local hospital for administration of an antidote or performance of other invasive procedures.
7. Transport to a health care facility.

Ingestion Exposure:
1. Evaluate vital signs including pulse and respiratory rate, and note any trauma. If no pulse is detected, provide CPR. If not breathing, provide artificial respiration. If breathing is labored, administer oxygen or other respiratory support.
2. DO NOT induce vomiting!
3. Obtain authorization and/or further instructions from the local hospital for administration of an antidote or performance of other invasive procedures.
4. Give the victims water or milk: children up to 1 year old, 125 mL (4 oz or 1/2 cup); children 1 to 12 years old, 200 mL (6 oz or 3/4 cup); adults, 250 mL (8 oz or 1 cup). Water or milk should be given only if victims are conscious and alert.
5. Activated charcoal may be administered if victims are conscious and alert. Use 15 to 30 g (1/2 to 1 oz) for children, 50 to 100 g (1-3/4 to 3-1/2 oz) for adults, with 125 to 250 mL (1/2 to 1 cup) of water.
6. Promote excretion by administering a saline cathartic or sorbitol to conscious and alert victims. Children require 15 to 30 g (1/2 to 1 oz) of cathartic; 50 to 100 g (1-3/4 to 3-1/2 oz) is recommended for adults.
7. Transport to a health care facility. (EPA, 1998)

Physical Properties

Flash Point: data unavailable

Lower Explosive Limit (LEL): data unavailable

Upper Explosive Limit (UEL): data unavailable

Autoignition Temperature: data unavailable

Melting Point: data unavailable

Vapor Pressure: 25 mm Hg at 123.8 ° F (EPA, 1998)

Vapor Density (Relative to Air): 6.414 (EPA, 1998)

Specific Gravity: 1.6947 at 68 ° F (EPA, 1998)

Boiling Point: 297 to 298 ° F at 760 mm Hg (EPA, 1998)

Molecular Weight: 185.87 (EPA, 1998)

Water Solubility: less than 1 mg/mL at 70° F (NTP, 1992)

Ionization Potential: data unavailable

IDLH: 10 ppm (NIOSH, 2016)

AEGLs (Acute Exposure Guideline Levels)

Exposure PeriodAEGL-1AEGL-2AEGL-3
10 minutes0.013 ppm 0.53 ppm 1.6 ppm
30 minutes0.013 ppm 0.37 ppm 1.1 ppm
60 minutes0.013 ppm 0.3 ppm 0.9 ppm
4 hours0.013 ppm 0.077 ppm 0.23 ppm
8 hours0.013 ppm 0.037 ppm 0.11 ppm

(NAC/NRC, 2016)

ERPGs (Emergency Response Planning Guidelines)

No ERPG information available.

PACs (Protective Action Criteria)

Perchloromethyl mercaptan (594-42-3) 0.013 ppm 0.3 ppm 0.9 ppm

(DOE, 2016)

Regulatory Information

EPA Consolidated List of Lists

Regulatory NameCAS Number/
313 Category Code
CAA 112(r)
Methanesulfenyl chloride, trichloro-594-42-3500 pounds100 pounds100 poundsX10000 pounds
Perchloromethyl mercaptan594-42-3500 pounds100 pounds100 pounds31310000 pounds
Trichloromethanesulfenyl chloride594-42-3500 pounds100 pounds100 poundsX10000 pounds

(EPA List of Lists, 2015)

DHS Chemical Facility Anti-Terrorism Standards (CFATS)

Chemical of InterestCAS NumberMin ConcSTQSecurity
Min ConcSTQSecurity
Min ConcSTQSecurity
Perchloromethylmercaptan; [Methanesulfenyl chloride, trichloro-] 594-42-31.00 %10000 poundstoxic

(DHS, 2007)

Alternate Chemical Names

This section provides a listing of alternate names for this chemical, including trade names and synonyms.

  • PCM
  • PMM

Synonyms: PMM; Trichloromethyl sulfur chloride; Trichloromethane sulfenyl chloride; Perchloromethanethiol

OSHA IMIS Code Number: 2030

Chemical Abstracts Service (CAS) Registry Number: 594-42-3

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number:PB0370000; 47915

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: 1670 55

NIOSH Pocket Guide to Chemical Hazards, Perchloromethyl mercaptan: chemical description, physical properties, potentially hazardous incompatibilities, and more

Chemical Description and Physical Properties:

pale yellow, oily liquid, foul-smelling, strong, acrid odor
molecular weight: 185.87
vapor pressure: 65 mm
molecular formula: CCl4S
boiling point: 300°F

Incompatibilities: Alkalies, amines, hot iron

OSHA Permissible Exposure Limit (PEL):

General Industry: 0.1 ppm, 0.8 mg.m3

Construction Industry: 0.1 ppm, 0.8 mg/m3 TWA

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 0.1 ppm, 0.76 mg/m3 TWA

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 0.1 ppm TWA

Potential Symptoms: Lacrimation, eye inflammation; nose, throat irritation; cough; dyspnea; deep breath pain, coarse rales; vomiting; pallor; tachycardia; acidosis; anuria

Health Effects: Irritation-Eye, Nose, Throat, Skin---Marked (HE14) Suspect carcinogen (HE2)

Affected Organs: Eyes, respiratory system, liver, kidneys, skin

Primary Laboratory Sampling/Analytical Method (SLC1):

  • Call the Salt Lake Technical Center for assistance.

Secondary Laboratory Sampling/Analytical Method (SAM2):

  • device: Instrumentation
    company: Infrared Spectrophotometer
    part #: MIRAN 1A & 1B
    range: 0.3 ppm @ 13.2 um
    class: Mfg

Articles: Reference: Nishikawa,Yoshinori; Kuwata, Kazuhira. . "Analytical Chemistry" 57, 1985, pp1864-8. Title: Liquid Chromatographic Determination of Low . Molecular Weight Alkylthiols in Air via . Derivatization with NBD-Chloride . (7-Chloro-4-Nitro-2,1,3-Benzoxadiazole) Collection: Sep-PAK Florisil coated with NBD-Cl (Tubes . used in OME 40 NBD-CL on XAD-7 may work) Air Vol and FLowrate: 100L at 0.8-1.2L/min Analysis: 2 mL of MeOH were used to dynamically desorb . the derivative. The samples stood at room temp . for 15 minutes before analysis by HPLC. Column: Develosil ODS-3 10cmx4mm at 30 deg C Eluent: 45/55 acetonitrile/water at 1 mL/min. Detector: UV at 425nm or fluorescent at 425 nm excitation . and 510 nm emission. Mercaptans studied: Methyl, ethyl, isopropyl, propyl, . 2-methyl-2-propyl, 2-butyl, . 2-methyl-1-propyl, and 1-butyl

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