CAS RN: 333-41-5

Disposal Methods

SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational harm/injury/toxicity or environmental contamination. 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 soil or water; effects on animal and plant life; and conformance with environmental and public health regulations.
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.
Pesticide Disposal: Pesticide wastes are toxic. Improper disposal is a violation of Federal law. To avoid harming aquatic organisms in rivers and other surface waters, do not pour spray mixture or rinse water into sanitary drains (for example; toilets, floor drains, and sinks) or into storm water sewers (for example; street drains). If pesticide, spray mixture, or rinsate cannot be disposed of by use according to the label instructions, contact your State Pesticide or Environmental Control Agency or the Hazardous Waste representative of the nearest EPA Regional Office for guidance. /Diazinon 50W/
Container Handling: Nonrefillable Container (flexible-bag-all weights): Nonrefillable container. Do not reuse or refill this container. Offer for recycling, if available. Once all water-soluble packets are used according to label instructions, dispose of empty outer bag in a sanitary landfill or by incineration, or, if allowed by State and local authorities, by burning. If burned, stay out of smoke.. /Diazinon 50W/
Container Handling: Nonrefillable Container (rigid-fifty pounds or less): Nonrefillable container. Do not reuse or refill this container. Offer for recycling, if available. Clean container promptly after emptying. Triple rinse as follows: Empty the remaining contents into application equipment or a mix tank. Fill the container 1/4 full with water and recap. Shake for 10 seconds. pour rinsate into application equipment or a mix tank or store rinsate for later use or disposal. Drain for 10 seconds after the flow begins to drip. Repeat this procedure two more times. /Diazinon 50W/
Hydrolysis: Diazinon is hydrolyzed in acid media. In excess water this cmpd yields diethylthiophosphoric acid and 2-isopropyl-4-methyl-6-hydroxypyrimidine. With insufficient water, highly toxic tetraethyl monothiopyrophosphate is formed.
Alkaline hydrolysis leads to complete degradation. The alkaline salt of diethylthiophosphoric acid and the 2-isopropyl-4-methyl-6-hydroxypyrimidine formed are considerably less toxic than diazinon. Acid hydrolysis: Complete degradation in large excess of water, same hydrolysis products are obtained as in alkaline hydrolysis. However, highly toxic tetraethyl dithio- and thiopyrophosphates have been found with insufficient water in acid medium. Oxidation leads to complete degradation but the diazoxon formed is equally toxic. For the decontamination of diazinon containers, the triple rinse and drain procedure developed by the National Agricultural Chemicals Association (NACA) is recommended. "Triple rinse" means the flushing of containers three times, each time using a volume of the normal diluent equal to approx 10% of the container's capacity and adding the rinse liquid to the spray mixture or disposing of it by a method prescribed for disposing of the pesticide. The use of a rinse soln containing caustic soda and detergent may also be considered. Recommendable methods: Hydrolysis & incineration. Peer-review: Large amt should be incinerated in a unit with effluent gas scrubbing. (Peer-review conclusions of an IRPTC expert consultation (May 1985))
The following wastewater treatment technologies have been investigated for diazinon: Concentration process: Biological treatment.
The following wastewater treatment technologies have been investigated for diazinon: Concentration process: Reverse osmosis.
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