Compilation, Evaluation, and Selection of Physical-Chemical Property Data for α-, β-, and γ-Hexachlorocyclohexane

Xiao, Hang; Li, and Nanqin; Wania, Frank

doi:10.1021/je034214i

Cited by 167 publications

(117 citation statements)

References 47 publications

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“…All food web components were polluted. Predominance of chlordecone compared to β-HCH in contamination profiles resulted from (i) the anterior use of technical HCH (this pesticide had been forbidden twenty years before chlordecone), (ii) the lower quantities spread on plantations (β-HCH only represented 5-12% of the total isomers contained in technical HCH mixture (Xiao et al, 2004)) and (iii) the less persistent characteristics of β-HCH compared to chlordecone: the partitioning coefficient (K OC ) between the adsorbed part onto organic matter and the dissolved part in water is about ten times lower for β-HCH, and confers to this molecule higher mobility in soils and solubility in water.…”

Section: Discussionmentioning

confidence: 99%

Organochlorine pollution in tropical rivers (Guadeloupe): Role of ecological factors in food web bioaccumulation

Coat¹,

Monti²,

Legendre³

et al. 2011

Environmental Pollution

117

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This paper determines the bioaccumulation and transfer processes of organochlorine pesticides within the stream food web in Guadeloupe (Caribbean). ABSTRACTConcentrations of organochlorine pesticides and stable isotope ratios of nitrogen and carbon were measured in a tropical freshwater ecosystem to evaluate the contamination level of biota and examine the bioaccumulation patterns of pollutants through the food web. Chemical analyses showed a general and heavy contamination of the entire food web. They revealed the strong accumulation of pollutants by juveniles of diadromous fishes and shrimps, as they re-enter the river. The role of ecological factors in the bioaccumulation of pesticides was evaluated. Whereas the most persistent pollutants (chlordecone and monohydro-chlordecone) were related to the organisms diet and habitat, bioaccumulation of β-HCH was only influenced by animal lipid content. The biomagnification potential of chlordecone through the food chain has been demonstrated. It highlighted the importance of trophic transfer in this compound bioaccumulation process. In contrast, bioconcentration by passive diffusion from water seemed to be the main exposure route of biota to β-HCH.

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Section: Discussionmentioning

confidence: 99%

Organochlorine pollution in tropical rivers (Guadeloupe): Role of ecological factors in food web bioaccumulation

Coat¹,

Monti²,

Legendre³

et al. 2011

Environmental Pollution

117

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“…23b). While this could have something to do with different patterns of historical usage of technical HCH and lindane affecting these two stations (for which only technical HCH contains significant amounts of α-HCH), it is also seen as a reflection of differences in physical-chemical properties between different HCH isomers (Xiao et al, 2004). This is in turn expected to affect the LRT potential within the group of HCHs (Beyer et al, 2003;Li et al, 2002), with γ -HCH being more easily subject to wet deposition compared to α-HCH.…”

Section: Temporal Trends Of Selected Popsmentioning

confidence: 99%

Introduction to the European Monitoring and Evaluation Programme (EMEP) and observed atmospheric composition change during 1972–2009

et al. 2012

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Abstract. European scale harmonized monitoring of atmospheric composition was initiated in the early 1970s, and the activity has generated a comprehensive dataset (available at http://www.emep.int) which allows the evaluation of regional and spatial trends of air pollution during a period of nearly 40 yr. Results from the monitoring made within EMEP, the European Monitoring and Evaluation Programme, show large reductions in ambient concentrations and deposition of sulphur species during the last decades. Reductions are in the order of 70-90 % since the year 1980, and correspond well with reported emission changes. Also reduction in emissions of nitrogen oxides (NO x ) are reflected in the measurements, with an average decrease of nitrogen dioxide and nitrate in precipitation by about 23 % and 25 % respectively since 1990. Only minor reductions are however seen since the late 1990s. The concentrations of total nitrate in air have decreased on average only by 8 % since 1990, and fewer sites show a significant trend. A majority of the EMEP sites show a decreasing trend in reduced nitrogen both in air and precipitation on the order of 25 % since 1990. Deposition of base cations has decreased during the past 30 yr, and the pH in precipitation has increased across Europe. Large inter annual variations in the particulate matter mass concentrations reflect meteorological variability, but still there is a relatively clear overall decrease at several sites during the last decade. With few observations going back to the 1990s, the observed chemical composition is applied to document a change in particulate matter (PM) mass even since 1980. These data indicate an overall reduction of about 5 µg m −3 from sulphate alone. Despite the significant reductions in sulphur emissions, sulphate still remains one of the single most important compounds contributing to regional scale aerosol mass concentration. Long-term ozone trends at EMEP sites show a mixed pattern. The year-to-year variability in ozone due to varying meteorological conditions is substantial, making it hard to separate the trends caused by emission change from other effects. For the Nordic countries the data indicate a reduced occurrence of very low concentrations. The most pronounced change in the frequency distribution is seen at sites in the UK and the Netherlands, showing a reduction in the higher values. Smaller changes are seen in Germany, while in Switzerland and Austria, no change is seen in the frequency distribution of ozone. The lack of long-term data series is a major obstacle for studying trends in volatile organic compounds (VOC). The scatter in the data is large, and significant changes are only found for certain components and stations. Concentrations of the heavy metals lead and cadmium have decreased in both air and precipitation during the last 20 yr, with reductions in the order of 80-90 % for Pb and 64-84 % for Cd (precipitation and air respectively). The measurements of total gaseous mercury indicate a dramatic decrease in concentrations during ...

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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 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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Compilation, Evaluation, and Selection of Physical-Chemical Property Data for α-, β-, and γ-Hexachlorocyclohexane

Cited by 167 publications

References 47 publications

Organochlorine pollution in tropical rivers (Guadeloupe): Role of ecological factors in food web bioaccumulation

Organochlorine pollution in tropical rivers (Guadeloupe): Role of ecological factors in food web bioaccumulation

Introduction to the European Monitoring and Evaluation Programme (EMEP) and observed atmospheric composition change during 1972–2009

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

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