O,O-diethyl hydrogen phosphorodithioate

Guidance on Safe Use

First-aid measures

Emergency and first aid procedures:

The first symptom to appear will be irritation for all routes of exposure. In case of exposure, do not wait for symptoms to develop. Immediately start the recommended procedures below  and call a physician, poison centre or hospital immediately. Describe the type and extent of exposure and the victim’s condition.

If breathing has stopped, immediately start artificial respiration and maintain until a physician takes charge of the exposed person.

Inhalation:

If experiencing any discomfort, immediately remove the exposed person from exposure. Get medical attention immediately if symptoms develop.

Eye contact:

Immediately rinse with much water or eyewash solution, occasionally opening eyelids, until no evidence of chemical remains. Remove contact lenses after a few minutes and rinse again. See physician immediately.

Skin contact:

Immediately flush with much water while removing contaminated clothing and footwear. Wash with water and soap. See physician immediately if irritation develops.

Ingestion:

Let the exposed person rinse mouth and let him/her drink several glasses of water or milk, but do not induce vomiting. If vomiting does occur, rinse mouth and drink fluids again. Never give anything by mouth to an unconscious person. Make the exposed person lie down and keep him/her steady. Get medical attention immediately.

Note to physician:

Irritated skin should be treated as usual against effects of acids or acid fumes. In case lungs are affected watch for pulmonary oedema. Probable mucosal damage may contraindicate the use of gastric lavage.

Fire-fighting measures

Extinguishing media and procedure

Dry chemical or carbon dioxide for small fires, water spray or foam for large fires. Use water spray to keep fire-exposed containers cool. Approach

fire from upwind to avoid hazardous vapours and toxic decomposition products. Fight fire from protected location or maximum possible distance. Avoid heavy hose streams. Dike area to prevent water runoff. Firemen should wear self-contained breathing apparatus and protective clothing. EP-1 hydrolyses in the presence of water under formation of hydrogen sulphide and development of heat. Therefore, do not use

water jet on a leaking container.

Hazardous decomposition in a fire

The essential breakdown products are volatile, toxic, malodorous, irritant and inflammable compounds such as hydrogen sulphide, sulphur dioxide, ethyl mercaptan, diethyl sulphide, phosphorus pentoxide, carbon monoxide and carbon dioxide.

Accidental release measures

Personal protection

Observe all personal protection and safety precautions. Depending on the magnitude of the spill, this may mean wearing respirator, face shield or eye protection, chemical resistant clothing, gloves and boots when cleaning up spills. Personal exposure by splashing must be avoided.

Steps to be taken in case of spill

It is recommended to have a predetermined plan for the handling of spills. Empty, closable vessels (not metal) for the collection of spills should be available. Stop the source of the spill immediately if safe to do so. Contain the spill to prevent any further contamination of surface, soil or water. Remove sources of ignition.

Cleaning method

Spills on the floor or other impervious surface should be absorbed onto an absorptive material such as universal binder, hydrated lime, Fuller’s earth or other absorbent clays. Collect the contaminated absorbent in suitable containers. Rinse area with soda lye and much water. Absorb wash liquid with absorbent and transfer to suitable containers. Wash waters must be prevented from entering surface water drains. Large spills which soak into the ground should be dug up and transferred to suitable containers. Spills in water should be contained as much as possible by isolation of the contaminated water. The contaminated water must be collected and removed for treatment or disposal. Uncontrolled discharge into water courses must be alerted to the appropriate regulatory body.

Disposal

The used containers should be properly closed and labelled.

Handling and storage

Precautions to be taken in handling

In an industrial environment it is recommended to avoid all personal contact with the product, if possible by using closed systems with remote system control. Otherwise the material should be handled by mechanical means as much as possible. Adequate ventilation or local exhaust ventilation is required. The exhaust

gases should be filtered or treated otherwise. Splashing and the formation of aerosol or mist must be avoided. Avoid contact with eyes, skin or clothing. Avoid breathing vapour and avoid exposure of eyes to vapour as well.

Precautions to be taken in storing

EP-1 is of limited stability, but when stored in coated, unopened drums at temperatures not exceeding 25°C, the decomposition is slow. Like other acids, EP-1 will corrode iron. Corrosion of iron is further activated by the presence of water. Storage should therefore take place in unopened drums or in properly protected tanks (e.g. lined with glass, polypropylene, epoxy or phenolic resin) in an inert gas atmosphere (e.g. nitrogen). If free from moisture, tanks of acid-resistant steel, such as 316 or V4A, can also be employed. Storage at temperatures not exceeding 25°C is recommended. EP-1 should not be heated above 40°C and also local heating above this temperature should be avoided. Protect against strong heat from sunshine or other source, e.g. fire.

Specific use

Intermediate for chemical manufacturing

Fire and explosion precautions

Heating above 40°C may only take place in connection with further processing of EP-1 and then only temporarily and under controlled conditions.

Transport information

Land transport (UN RTDG/ADR/RID)

UN number:

1760

Shipping information

Proper shipping name and description:

Corrosive liquid, n.o.s. (O,O-Diethyl phosphorodithioic acid)

Chemical name:

O,O-Diethyl phosphorodithioic acid

Language:

English

Labels:

C; R20/22-34

SpecialProvisions

Inland waterway transport (UN RTDG/ADN(R))

UN number:

1760

Shipping information

Proper shipping name and description:

Corrosive liquid, n.o.s. (O,O-Diethyl phosphorodithioic acid)

Chemical name:

O,O-Diethyl phosphorodithioic acid

Language:

English

Labels:

C; R20/22-34

Remarks

Marine transport (UN RTDG/IMDG)

UN number:

1760

Shipping information

Proper shipping name and description:

Corrosive liquid, n.o.s. (O,O-Diethyl phosphorodithioic acid)

Chemical name:

O,O-Diethyl phosphorodithioic acid

Labels:

C; R20/22-34

Remarks

Air transport (UN RTDG/ICAO/IATA)

UN number:

1760

Shipping information

Proper shipping name and description:

Corrosive liquid, n.o.s. (O,O-Diethyl phosphorodithioic acid)

Chemical name:

O,O-Diethyl phosphorodithioic acid

Labels:

C; R20/22-34

Remarks

SpecialProvisions

Exposure controls / personal protection

Personal exposure limits

To our knowledge, no exposure limits have been established for this compound. However, exposure limits defined by local regulations may exist and must be observed.

Personal protection

When used in a closed system, personal protection equipment will not be required. The following is meant for other situations, when the use of a closed system is not possible, or when it is necessary to open the system. Consider the need to render equipment or piping systems non-hazardous before opening.

Respiratory protection

In case of insufficient ventilation, workers should put on officially approved respiratory protection equipment with a combination filter type against acids and including particle filter.

Protective gloves

Wear chemical resistant gloves, such as barrier laminate, butyl rubber or nitrile rubber. The breakthrough times of these materials for this product are unknown. Generally, however, the use of protective gloves will give only partial protection against dermal exposure. Small tears in the gloves and cross-contamination can easily occur. It is recommended to shift the gloves frequently and to limit the work to be done manually.

Eye protection

Wear face mask rather than safety glasses or goggles. It is recommended to have an eye wash fountain immediately available in the workplace when there is a potential for eye contact.

Other protection

Wear appropriate chemical resistant clothing to prevent skin contact. Safety showers should be readily available in all areas where the product is handled or stored.

Work/hygienic practices

Keep all unprotected persons and children away from working area. Avoid contact with eyes, skin or clothing. Avoid breathing vapour or mist. Remove contaminated clothing immediately. Wash thoroughly after handling. Before removing gloves, wash them with water and soap. After work, take off all work clothes and footwear. Take a shower, using water and soap. Wear only clean clothes when leaving job. Wash protective clothing and protective equipment with water and soap after each use.

Stability and reactivity

Thermal decomposition .

EP-1 will decompose rapidly when heated to temperatures above 80°C, significantly increasing the risk of explosion. The decomposition is dependent on time as well as temperature due to self-accelerating exothermic and autocatalytic reactions. The reactions involve rearrangements and polymerisation releasing volatile malodorous and inflammable compounds such as ethyl mercaptan, diethyl sulphide, carbon monoxide and hydrogen sulphide.

Hazardous decomposition products

The essential breakdown products are volatile, toxic, malodorous, irritant and inflammable compounds such as hydrogen sulphide, sulphur dioxide, ethyl mercaptan, diethyl sulphide, phosphorus pentoxide, carbon monoxide and carbon dioxide.

Materials to avoid

Strong alkalis. An acid-base neutralisation reaction can be hazardous because of heat release. Amines and strong oxidising compounds. The substance can corrode metals.

Disposal considerations

Waste disposal method

Waste material that cannot be reused or chemically reprocessed can be disposed of by removal to a licensed chemical destruction plant or by controlled incineration with flue gas scrubbing. Do not contaminate water or foodstuffs by storage or disposal.

Packaging/container disposal

Triple rinse (or equivalent) and offer for recycling or reconditioning. Alternatively, the packaging can be punctured to make it unusable for other purposes and then be disposed of in a sanitary landfill. Controlled incineration with flue gas scrubbing is possible for combustible packaging materials. Disposal of waste and packagings must always be in accordance with all applicable local regulations.