Accelerated hydrolysis of organophosphorus hydraulic fluids and related organophosphates using sodium-perborate generated HO{sub 2}{sup -}
- Univ. of Nevada, Reno, NV (United States)
Methods of remediation of contaminated soil and groundwater at military bases becomes more important as more military installations are closing and the public demands environmental restoration. Chemical degradation of the contaminants is preferable to other clean-up methods which simply remove or entomb the contamination without reducing its toxicity. One relatively ubiquitous source of soil contamination at military sites where high-performance aircraft have been operated is phosphate-ester hydraulic fluids, which were often rinsed from the aircraft into drainage ditches during routine maintenance. The chemical degradation of isomers of TCP (tricresylphosphate), a major component of flame-retardant hydraulic fluids, and other OPs (organophosphates) was investigated. A method using sodium perborate-generated HO{sub 2}{sup -} as the hydrolyzing nucleophile was modified for sparingly water soluble OPs such as TCP. Rates of hydrolysis in sodium perborate solutions were 10 to 100 times faster than hydrolysis in sodium carbonate control solutions with similar pH levels. Degradation rates among the OPs tested varied due to differences in their leaving groups, steric hindrance of nucleophilic attack, and between thio and oxy esters. Application of this hydrolysis method in a soil-slurry is currently under investigation.
- OSTI ID:
- 126387
- Report Number(s):
- CONF-950402-; TRN: 95:006086-0371
- Resource Relation:
- Conference: 209. American Chemical Society (ACS) national meeting, Anaheim, CA (United States), 2-6 Apr 1995; Other Information: PBD: 1995; Related Information: Is Part Of 209th ACS national meeting; PB: 2088 p.
- Country of Publication:
- United States
- Language:
- English
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