Estimation of vapor pressures, solubilities and Henry's law constants of selected persistent organic pollutants as functions of temperature

The Henry's law constant (H) is an important parameter that is required to estimate the air-water exchange of semivolatile organic compounds. Henry's law constants for 17 banned/restricted/currently used organochlorine pesticides (OCPs) were experimentally determined using a gas-stripping technique in deionized and saline water (3%) over a temperature range of 5-35 1C. H values (at 25 1C) ranged between 0.06670.037 Pa m 3 mol À1 (endosulfan II) and 62.0724.2 Pa m 3 mol À1 (heptachlor) in deionized water while the range in saline water was 0.2870.03 Pa m 3 mol À1 (g-HCH) and 135.2731.3 Pa m 3 mol À1 (heptachlor). The increase in dimensionless Henry's law constants (H 0 ) for OCPs over the studied temperature range was between 3 (g-HCH)-19 times (chlorpyrifos) and 3 (endosulfan II)-80 times (transnonachlor) in deionized and saline water, respectively. The calculated enthalpies of phase change (DH H ) were within the ranges previously reported for OCPs and other organic compounds (23.8-100.2 kJ mol À1 ). The salting-out constant, k s , ranged between 0.04 (g-HCH) and 1.80 L mol À1 (endosulfan II) indicating the importance of assessing the H values of OCPs in saline water to accurately determine their partitioning and fate in seawater. r

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“…DH H values of 10 OCPs were reported in the literature. Paasivirta et al (1999) Xiao et al (2004). c Paasivirta et al (1999).…”

Section: Article In Pressmentioning

confidence: 99%

Determination of Henry's law constants of organochlorine pesticides in deionized and saline water as a function of temperature

Çetin

Özer

Sofuoğlu

et al. 2006

Atmospheric Environment

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“…The organochlorine pesticides are in general very hydrophobic substances with low aqueous solubility and high octanol-water partition coefficients ranging from 3 to 7 (Wania, Mackay, 1995;Paasivirta et al, 1999). As a consequence of their physico-chemical properties, these pesticides tend to accumulate mainly in "natural" organic matter of the soils, sediments and living organisms (Menone et al, 2006;Chi, 2009;Zhao et al, 2009), and have a long persistence in the environment.…”

Section: Introductionmentioning

confidence: 99%

Occurrence of selected organochlorine pesticide residues in surface sediments from the Velke Kozmalovce, Ruzin, and Zemplinska Sirava water reservoirs, Slovakia

Hiller

Sirotiak²,

Tatarková³

et al. 2011

Journal of Hydrology and Hydromechanics

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Surface sediment samples from three water reservoirs of Slovakia were analyzed for selected organochlorine pesticides (OCPs). Concentrations of total dichlorodiphenyltrichloroethanes (ΣDDTs) in the sediments from Velke Kozmalovce, Ruzin, and Zemplinska Sirava ranged from 12 to 24 ng g -1 , 5 to 28 ng g -1 , and 1 to 20 ng g -1 , respectively, with the exception of one sediment sample from Zemplinska Sirava, having anomalously high concentration of ΣDDTs (526 ng g -1 ). Concentrations of hexachlorobenzene (HCB) in the sediments from these water reservoirs were generally lower and ranged from 0.3 to 9 ng g -1 . Other organochlorine pesticides such as mirex, lindane and heptachlor were not detected in the surface sediments. Ratios of DDT/(DDE + DDD) were lower than 1.0 in majority of the sediment samples indicating that the degradation of the parent DDT occurred significantly and DDT in the sediments from the studied water reservoirs was derived mainly from the weathered agricultural soils. Moreover, ratios of DDD/DDE indicated that the parent DDT was degraded under aerobic conditions before depositing into the sediments of these water reservoirs. . Iné v sedimentoch sledované organochlórované pesticídy ako mirex, lindán a heptachlór neboli zistené. Vo väčšine vzoriek sedimentov boli hodnoty pomeru DDT/(DDE + DDD) nižšie ako 1, z čoho sa dá usúdiť, že väčšia časť pôvodne prítomného DDT sa rozložila na jeho hlavné metabolity a že DDT v sedimentoch vodných nádrží pochádza najmä z erodovaných poľnohospodárskych pôd. Hodnoty pomeru DDD/DDE ukázali, že predtým ako bol DDT deponovaný do sedimentov vodných nádrží, rozkladal sa najmä za aeróbnych podmienok.KĽÚČOVÉ SLOVÁ: organochlórované pesticídy, DDT, dnové sedimenty, vodná nádrž, organická hmota.

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“…Although the 16 PAHs have no functional groups in their structures, their characteristics range widely, depending on the numbers of benzene rings that are present: the boiling points range from 218 to 525˚C, 7 and the octanol-water partitioning coefficients (log Ko/w) vary from 3.54 to 7.07. 12 Thus, the various PAHs would be expected to show different behaviors during analytical processes and, in particular, to show different recovery yields of spiked internal standards. With respect to different behaviors of isotope-labeled PAHs relative to native PAHs, we previously reported that such differences occur during extraction steps involving pressurized-liquid extraction (PLE) even when the corresponding 13 C-labeled PAHs are used as internal standards, and they also affect the observed concentrations (by -1.4 to +0.81% for extraction at 150˚C, and by -8.5 to -1.1% for extraction at 40˚C).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Behavioral Differences between Native Polycyclic Aromatic Hydrocarbons and 13C-Labeled Internal Standards during Clean-up Steps of Analysis

2007

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We confirmed that concentrations of polycyclic aromatic hydrocarbons (PAHs) obtained by isotope dilution mass spectrometry (IDMS) using the corresponding 13 C-labeled internal standards are reliable even after clean-up steps. Change in the ratio of phenanthrene to 13 C6-phenanthrene was less than 0.2%, although the recovery yield of 13 C6-phenanthrene decreased to 60%. Since changes in the ratios were commonly within the relative standard deviations of the concentrations (1.5 -5.4%) obtained using gas chromatography-mass spectrometry in combination with pressurizedliquid extraction, concentrations obtained by IDMS with 13 C-PAHs should be reliable.

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Estimation of vapor pressures, solubilities and Henry's law constants of selected persistent organic pollutants as functions of temperature

Cited by 173 publications

References 50 publications

Determination of Henry's law constants of organochlorine pesticides in deionized and saline water as a function of temperature

Determination of Henry's law constants of organochlorine pesticides in deionized and saline water as a function of temperature

Occurrence of selected organochlorine pesticide residues in surface sediments from the Velke Kozmalovce, Ruzin, and Zemplinska Sirava water reservoirs, Slovakia

Evaluation of Behavioral Differences between Native Polycyclic Aromatic Hydrocarbons and 13C-Labeled Internal Standards during Clean-up Steps of Analysis

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