Partition constants of chlorinated dibenzofurans and dibenzo-p-dioxins

Govers, H.A.J.; Krop, H.B.

doi:10.1016/s0045-6535(98)00276-8

Cited by 105 publications

(71 citation statements)

References 12 publications

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“…The steady-state concentration by the operation method is shown for both the first and last sets of three consecutive time points. Kow values from Govers and Krop (1998) Figure D9. Uptake curves for Macoma nasuta exposed to mercury and methyl mercury in the Newark Bay sediment.…”

Section: Relationship To K Owmentioning

confidence: 99%

Determining Steady-state Tissue Residues for Invertebrates in Contaminated Sediment

Kennedy¹,

Lotufo²,

Steevens³

et al. 2010

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Risk assessment of contaminated sediments often involves quantification of compounds in tissues via laboratory bioaccumulation exposures of benthic invertebrates. However, the standard 28-day exposure duration may not be adequately long for some compounds to reach steady state, defined as a stable concentration in exposed organisms. Steady-state tissue residues can be estimated using uptake and elimination rate constants. Experiments were conducted using two marine sediments from New York Harbor to assess bioaccumulation of PAHs, PCBs, chlorinated pesticides, dioxins, and Hg by sampling tissue during seven successive time points over an exposure of 56 days for the polychaete worm Nereis virens and 119 days for the clam Macoma nasuta. Exposure time required to attain steady state was organism and compound specific. Generally, N. virens tissues reached steady state more rapidly and accumulated higher contaminant residues. Nereis virens attained apparent steady state within roughly 28 days for PAHs, Hg, and most PCBs, but longer exposure was needed for some dioxins and pesticides. Steady state in M. nasuta was generally attained after 28 days of exposure for most compounds (some times after 100 days). Thus, some 28-day tissue residues may underestimate bioaccumulation and subsequently risk to benthos and higher trophic level organisms. The results of this study allow development of site-specific correction factors for estimating steady-state residues from 28-day exposures.

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Section: Relationship To K Owmentioning

confidence: 99%

Determining Steady-state Tissue Residues for Invertebrates in Contaminated Sediment

Kennedy¹,

Lotufo²,

Steevens³

et al. 2010

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“…The molecular polarity of an isomer is, in turn, known to be related to several parameters, such as its vapor pressure. [12][13][14] The data in Table 2 also show that the gaseous phase ratio of an isomer tends to increase with increasing vapor pressure. Figure 5 shows the seasonal changes of the gaseous phase ratios of the four main isomers of TeCDFs.…”

Section: Seasonal Change Of the Gas/particle Partitioning Of Atmosphementioning

confidence: 85%

“…The names of all the isomers in this table are in the order of the retention time on their SIM chromatograms. Values of subccoled liquid vapor pressure at 25 AE C; P (Pa) listed in this table were calculated by Govers and Krop (1998) 14µ and the values of inseparable peaks which include multiple isomers mean the average of subcooled liquid vapor pressures of these isomers.…”

Section: Seasonal Change Of the Gas/particle Partitioning Of Atmosphementioning

confidence: 99%

Seasonal Change of Gas/Particle Partitioning of Atmospheric Dioxins

Oka

Kakimoto²,

Miyata³

et al. 2006

JOURNAL OF HEALTH SCIENCE

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“…The sediment to culture ratio was 10 g/L. Assuming a maximum aqueous-phase solubility of 1.95 nM 1,2,3,4 TeCDD (Govers and Krop, 1998), the aqueous-phase 1,2,3,4-TeCDD would account for 0.0063% of added 1,2,3,4-TeCDD, with greater than 99.99% sorbed to sediment, colloid matter, and the vessel.…”

Section: Methodsmentioning

confidence: 99%

Quantifying Enhanced Microbial Dehalogenation Impacting the Fate and Transport of Organohalide Mixtures in Contaminated Sediments

Häggblom¹,

Fennell²,

Rodenburg³

et al. 2012

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Standard Form 298 (Rev. 8/98) REPORT DOCUMENTATION PAGEPrescribed by ANSI Std. Z39.18 Form Approved OMB No. 0704-0188The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to the Department of Defense, Executive Services and Communications Directorate (0704-0188). Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ORGANIZATION. 1. REPORT DATE (DD-MM-YYYY)2. REPORT TYPE 3. DATES COVERED (From -To) 4. TITLE AND SUBTITLE 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 5d. PROJECT NUMBER 5e. TASK NUMBER 5f. WORK UNIT NUMBER AUTHOR(S) PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBER SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S)12 SERDPThe project investigated techniques and amendments to enhance microbial dehalogenation in sediments contaminated with organohalide mixtures and developed methods and tools to monitor the effectiveness of biostimulation processes. Micro-and mesocosm studies with organohalide-contaminated sediments demonstrated that these contain diverse communities of dehalogenating microorganisms. Dechlorination of historical PCB and PCDD/F contaminant mixtures can be stimulated by addition of amendments and/or bioaugmentation with dechlorinating bacteria. The enhanced dechlorination correlates with increased numbers of dehalorespirer populations and reductive dehalogenase genes. Identification of the specific microbial members associated with PCB-and PCDD/F-dechlorinating activity should allow for better strategies to enhance dehalogenation. The results provide compelling evidence to support further testing and development of biostimulation and bioaugmentation with dehalorespiring bacteria as environmentally less invasive and lower cost alternatives for in situ treatment of PCB impacted sediments. Anacostia microcosms compared to the sum of all di-through deca-chlorinated biphenyls (homolog groups 2 through 10). Analyses of the dry matter content, the total PCB concentration, the average number and percentage of chlorines less than 4 and 6, respectively and in soil samples and commercial Aroclor mixtures. Table 6-2. Analyses of total bacteria, putative dechlorinating and PCB degrading bacteria and the number of dechlorinating bacteria in soil samples. Table 6-3. The potential dechlorination activi...

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Partition constants of chlorinated dibenzofurans and dibenzo-p-dioxins

Cited by 105 publications

References 12 publications

Determining Steady-state Tissue Residues for Invertebrates in Contaminated Sediment

Determining Steady-state Tissue Residues for Invertebrates in Contaminated Sediment

Seasonal Change of Gas/Particle Partitioning of Atmospheric Dioxins

Quantifying Enhanced Microbial Dehalogenation Impacting the Fate and Transport of Organohalide Mixtures in Contaminated Sediments

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