A Rapid and Sensitive Method for Determining Volatile Organohalides in Water

Mieure, James P.

doi:10.1002/j.1551-8833.1977.tb02545.x

Cited by 50 publications

(12 citation statements)

References 3 publications

(1 reference statement)

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“…(i) Methylene chloride. Methylene chloride concentration was determined by solvent extraction and gas chromatography (7,13). With concentrations greater than 100 ,ug/liter, a 1-ml sample was injected into a 0.5-dram (ca.…”

Section: Methodsmentioning

confidence: 99%

Secondary substrate utilization of methylene chloride by an isolated strain of Pseudomonas sp

LaPat-Polasko¹,

McCarty²,

Zehnder³

1984

Appl Environ Microbiol

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Secondary substrate utilization of methylene chloride was analyzed by using Pseudomonas sp. strain LP. Both batch and continuously fed reactors demonstrated that this strain was capable of simultaneously consuming two substrates at different concentrations: the primary substrate at the higher concentration (milligrams per liter) and the secondary substrate at the lower concentration (micrograms per liter). The rate of methylene chloride utilization at trace concentrations was greater in the presence of the primary substrate, acetate, than without it. However, when the substrate roles were changed, the acetate secondary substrate utilization rate was less when methylene chloride was present. Thus, substrate interactions are important in the kinetics of secondary substrate utilization. Pseiudomonas sp. strain LP showed a preference toward degrading methylene chloride over acetate, whether it was the primary or secondary substrate, providing it was below an inhibitory concentration of ca. 10 mg/liter. Methylene chloride (dichloromethane) is designated as a priority pollutant by the U.S. Environmental Protection Agency (20). It is widely used for cleaning, fumigation, refrigeration, paint removal, analytical applications, and as an aerosol propellant (23). Treated municipal wastewaters have been recorded to contain as much as 24 [.g of methyl

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Section: Methodsmentioning

confidence: 99%

Secondary substrate utilization of methylene chloride by an isolated strain of Pseudomonas sp

LaPat-Polasko¹,

McCarty²,

Zehnder³

1984

Appl Environ Microbiol

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“…Dichloromethane was measured by a modification of the extraction techniques of Mieure (5) and Richard and Junk (7). To a 1.84-ml (0.5dram) vial was added 0.1 ml of octane which had been refluxed to remove volatile organic compounds.…”

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confidence: 99%

“…The column packing was 10% squalene on Chromosorb W (80/100 mesh), the 95% argon-5% methane carrier gas flow rate was 60 ml/min, and the isothermal oven temperature was 700C. Extraction recoveries with this technique are constant, give linear responses, and range from 78 to 97% for various tested compounds (5,7). Dichloromethane had a linear response over the concentration range of 0.1 to 100 mg/liter.…”

mentioning

confidence: 99%

Utilization of Dichloromethane by Suspended and Fixed-Film Bacteria

Rittmann

McCarty

1980

Appl Environ Microbiol

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Dichloromethane (methylene chloride) was biodegraded by and supported growth of suspended and fixed-film bacteria enriched from sewage. Dichloromethane (CH2Cl2), which is also called methylene chloride, is commonly used as a solvent for cleaning, extraction, refrigeration, and fumigation in many industrial and analytical applications (8). Being widely used and relatively water soluble (20 g/liter at 200C [8]), CH2Cl2 is ubiquitous in aqueous environments.

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“…4. Column conditions are as follows: a 1.8-m by 2-mm (ID) silanized glass columnjt packed with 0.2 percent SP 1000 on 60-80 Carbopack AJJ was used; injection port and detector temperatures both were 180 C. For hexane injections the column temperature was 70 C and the gas flow rate (argon-methane passed through molecular sieves*) was 24 detector exhaust. For isooctane, the column tempera ture was 60 C and the gas flow rate was 40 mL/min.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%