nbk2000
April 8th, 2007, 12:00 AM
It is a colorless, odorless, oily fluid at STP, with non-irritating vapors that allow a lethal dose to be inhaled without warning, and with a 4 hour delay between exposure and effect, making it insidious in nature and on par with Mustard Gas (except for it's resistance to hydrolysis).
Acute exposure to the vapors of DMS causes severe inflammation and necrosis of the eyes, mouth, and respiratory tract. Acute oral or inhalation exposure to DMS primarily damages the lungs but also injures the liver, kidneys, heart, and central nervous system (CNS). Even at low concentrations it has a vesicant action on the skin.
The LD50 is estimated at about 150mg/M3.
From DuPont's website (http://www.dupont.com/dms/safety/index.html):
Vapor Exposure
Effect of Vapor on Eyes
Dimethyl sulfate vapor may cause injury to the eyes and adjacent tissues that varies from slight irritation with tears to severe inflammation and edema of the eyelids and the eyeball. Irritation of the eyes may not be noted until several hours after exposure to low concentrations of the vapor. After the acute effects have subsided in severe cases, increased sensitivity to light, partial color blindness, and reduced visual acuity may persist.
An early symptom of overexposure to dimethyl sulfate vapor is a fiery red inflammation of the eyes (possibly accompanied by a delayed burning sensation). If this occurs, first aid should be given promptly, and appropriate preventive action should be taken to ascertain presence of possible leaks. Because of variation in individual susceptibility and possible delayed effects, these symptoms should not be relied on in lieu of other methods of monitoring air concentrations of DMS.
Effect of Inhaled Vapor
Dimethyl sulfate vapor is extremely irritating to all parts of the respiratory tract. This irritation may not be noted until several hours after exposure. Mild exposure leads to dry, painful cough, chest pain, and irritation of the nose and throat that may pass in 1 or 2 days, leaving only dryness of the throat. Moderate exposure causes reddening and swelling of the nasal mucous membranes and the vocal cords. The lungs and trachea are affected; there may be foamy, white sputum. With proper treatment aimed at reducing cough, the patient may recover in a few days; otherwise, more serious injury to the lungs may follow. In 6 to 8 hours, severe exposures lead to great difficulty of breathing, with general malaise and fever as well as a rapidly developing inflammation and edema of the lungs. Severe exposures may be fatal.
Effect of Vapor on Skin
Skin exposure to high concentrations of the vapor may produce reddening and possible burns. In exposure to high vapor concentrations, dimethyl sulfate may penetrate the skin and produce systemic poisoning.
Liquid Exposure
Effect of Liquid on Eyes
Contact of liquid DMS with the eyes rapidly causes severe irritation of the eyes and eyelids. Unless the liquid is quickly removed by thorough irrigation with water, prolonged or permanent eye damage may result.
Effect of Liquid on Skin
Contact of liquid dimethyl sulfate with the skin produces initial reddening and possibly itching, followed by severe burns that may extend through the skin to the underlying tissues if the liquid is not rapidly removed. These burns may heal slowly. In lower concentrations, the corrosive action on the skin is accompanied by prolonged analgesia. Dimethyl sulfate may be absorbed through the skin, and absorption of large quantities may produce pulmonary effects, circulatory collapse, convulsions, and unconsciousness. The effects of dilute solutions may not appear for several hours.
Good stuff! :)
http://rapidshare.com/files/24871755/OTC_DMS.rar.html
The usual password for the above.
In summary, the process uses a Sodium Sulfate, Sulfuric Acid, and Methanol in a distillation process to produce DMS in a ready-to-use state.
To convert concentrations in air (at 25 °C) from ppm to mg/m3: mg/m3 = (ppm) × (molecular weight of the compound)/(24.45)
Acute exposure to the vapors of DMS causes severe inflammation and necrosis of the eyes, mouth, and respiratory tract. Acute oral or inhalation exposure to DMS primarily damages the lungs but also injures the liver, kidneys, heart, and central nervous system (CNS). Even at low concentrations it has a vesicant action on the skin.
The LD50 is estimated at about 150mg/M3.
From DuPont's website (http://www.dupont.com/dms/safety/index.html):
Vapor Exposure
Effect of Vapor on Eyes
Dimethyl sulfate vapor may cause injury to the eyes and adjacent tissues that varies from slight irritation with tears to severe inflammation and edema of the eyelids and the eyeball. Irritation of the eyes may not be noted until several hours after exposure to low concentrations of the vapor. After the acute effects have subsided in severe cases, increased sensitivity to light, partial color blindness, and reduced visual acuity may persist.
An early symptom of overexposure to dimethyl sulfate vapor is a fiery red inflammation of the eyes (possibly accompanied by a delayed burning sensation). If this occurs, first aid should be given promptly, and appropriate preventive action should be taken to ascertain presence of possible leaks. Because of variation in individual susceptibility and possible delayed effects, these symptoms should not be relied on in lieu of other methods of monitoring air concentrations of DMS.
Effect of Inhaled Vapor
Dimethyl sulfate vapor is extremely irritating to all parts of the respiratory tract. This irritation may not be noted until several hours after exposure. Mild exposure leads to dry, painful cough, chest pain, and irritation of the nose and throat that may pass in 1 or 2 days, leaving only dryness of the throat. Moderate exposure causes reddening and swelling of the nasal mucous membranes and the vocal cords. The lungs and trachea are affected; there may be foamy, white sputum. With proper treatment aimed at reducing cough, the patient may recover in a few days; otherwise, more serious injury to the lungs may follow. In 6 to 8 hours, severe exposures lead to great difficulty of breathing, with general malaise and fever as well as a rapidly developing inflammation and edema of the lungs. Severe exposures may be fatal.
Effect of Vapor on Skin
Skin exposure to high concentrations of the vapor may produce reddening and possible burns. In exposure to high vapor concentrations, dimethyl sulfate may penetrate the skin and produce systemic poisoning.
Liquid Exposure
Effect of Liquid on Eyes
Contact of liquid DMS with the eyes rapidly causes severe irritation of the eyes and eyelids. Unless the liquid is quickly removed by thorough irrigation with water, prolonged or permanent eye damage may result.
Effect of Liquid on Skin
Contact of liquid dimethyl sulfate with the skin produces initial reddening and possibly itching, followed by severe burns that may extend through the skin to the underlying tissues if the liquid is not rapidly removed. These burns may heal slowly. In lower concentrations, the corrosive action on the skin is accompanied by prolonged analgesia. Dimethyl sulfate may be absorbed through the skin, and absorption of large quantities may produce pulmonary effects, circulatory collapse, convulsions, and unconsciousness. The effects of dilute solutions may not appear for several hours.
Good stuff! :)
http://rapidshare.com/files/24871755/OTC_DMS.rar.html
The usual password for the above.
In summary, the process uses a Sodium Sulfate, Sulfuric Acid, and Methanol in a distillation process to produce DMS in a ready-to-use state.
To convert concentrations in air (at 25 °C) from ppm to mg/m3: mg/m3 = (ppm) × (molecular weight of the compound)/(24.45)