Use of sequential ASE extraction to evaluate the bioavailability of DDT and its metabolites to wheat roots in soils with various organic carbon contents

Tao, Shu; Guo, Lu; Wang, X.J.; Liu, W.X.; Ju, Tingting; Dawson, R.; Cao, Jianhua; Xu, Fu-Liu; Li, B.G.

doi:10.1016/s0048-9697(03)00452-2

Cited by 51 publications

(22 citation statements)

References 20 publications

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“…A negative correlation was also observed between the DOC contents and the amounts of p,p 0 -DDT desorption (R = 0.805, p < 0.05). The DOC in soil can enhance the dissolution of organic compounds in soil (Chiou et al, 1986;Seol and Lee, 2000;Tao et al, 2004a). The most likely reason for this negative relationship between the DOC and the DDT desorption is due to the dynamic equilibrium between SOC and DOC in soils (Antoniadis and Alloway, 2002;Ben-Hur et al, 2003), indeed, a positive correlation between SOC and DOC was found in this study (R = 0.895, p < 0.01).…”

Section: Abiotic Pp 0 -Ddt Desorption and Its Relationship With Soilsupporting

confidence: 52%

“…The mechanisms involved are likely to be due to hydrophobic adsorption and partitioning (Senesi, 1992). DDT is a highly lipophilic compound which will bind with SOC and thus make it less mobile (Tao et al, 2004a). SOC includes both soluble and insoluble fractions of organic carbon, and the proportion of dissolved organic carbon (DOC) in a soil is usually very small.…”

Section: Abiotic Pp 0 -Ddt Desorption and Its Relationship With Soilmentioning

confidence: 99%

“…SOC includes both soluble and insoluble fractions of organic carbon, and the proportion of dissolved organic carbon (DOC) in a soil is usually very small. Both solid organic carbon and dissolved organic carbon have to be taken into account for a proper description of the distribution of hydrophobic compounds in sediment or soil/water system (Chiou et al, 1986;Ben-Hur et al, 2003;Tao et al, 2004a). A negative correlation was also observed between the DOC contents and the amounts of p,p 0 -DDT desorption (R = 0.805, p < 0.05).…”

Section: Abiotic Pp 0 -Ddt Desorption and Its Relationship With Soilmentioning

confidence: 99%

“…Although DDT is banned in developed nations, it is still being used in developing nations (Kunisue et al, 2003;Nakata et al, 2005). Additional release of DDT into the soil environment occurs due to the impurity of some other pesticides being used, such as dicofol (Qiu et al, 2004;Tao et al, 2004a;Nakata et al, 2005). The DDT in soil may be taken up by plants or degraded or transported to ground and surface waters, and thus its environmental fate still needs much attention.…”

Section: Introductionmentioning

confidence: 99%

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Oxalate and root exudates enhance the desorption of p,p′-DDT from soils

et al. 2006

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The abiotic desorption of p,p 0 -DDT from seven Chinese soils spiked with p,p 0 -DDT and the effects of oxalate at 0.001-0.1 M and the root exudates of maize, wheat, and ryegrass were evaluated using batch experiments. Soil organic carbon played a predominant role in the retention of DDT. Oxalate significantly increased the desorption of p,p 0 -DDT, with the largest increments ranging from 11% to 54% for different soils. Oxalate addition also resulted in the increased release of dissolved organic carbon and inorganic ions from soils. Root exudates had similar effects to those of oxalate. Root exudates significantly increased DDT desorption from the soils, and the general trend was similar among the plant species studied for all the soils (p > 0.05). Low molecular weight dissolved organic carbon amendments caused partial dissolution of the soil structure, such as the organo-mineral linkages, resulting in the release of organic carbon and metal ions and thus the subsequent enhanced desorption of DDT from the soils. The enhancing effects of oxalate and root exudates on DDT desorption were influenced by the contents of soil organic carbon and dissolved organic carbon in soils.

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Section: Abiotic Pp 0 -Ddt Desorption and Its Relationship With Soilsupporting

confidence: 52%

Section: Abiotic Pp 0 -Ddt Desorption and Its Relationship With Soilmentioning

confidence: 99%

Section: Abiotic Pp 0 -Ddt Desorption and Its Relationship With Soilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oxalate and root exudates enhance the desorption of p,p′-DDT from soils

et al. 2006

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“…It is thus appropriate to use mild, selective extractants to assess the bioavailability of POPs (Kelsey et al, 1997;Dean et al, 2004). As n-hexane used in this experiment is thought to be a mild solvent, the extraction results probably demonstrate the HCB bioavailability in soil (Tao et al, 2004). Thus this decreasing trend may also reveal the decreasing bioavailability of HCB in soil with increasing aging time.…”

Section: Methodsmentioning

confidence: 91%

Tracing the behaviour of hexachlorobenzene in a paddy soil-rice system over a growth season

Yang

Zheng

Zhu

2008

Journal of Environmental Sciences

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Hexachlorobenzene (HCB), a persistent organic pollutant (POP), has been found in paddy soils. To improve the understanding of HCB contamination in paddy soils, a laboratory simulative study was carried out to investigate the behavior of HCB in a paddy soil and rice plants. This study was divided into three experiments. First, an experiment aimed to examine the evaporation of HCB in paddy soil. In the second experiment, rice was planted in 10 mg/kg HCB contaminated soil and after pot culture at 3, 6, 9, and 27 weeks (at maturity), both soil and plant samplings were scheduled to be sampled. The soil samples comprised rhizosphere soil, nonrhizosphere soil, and unplanted contaminated soil, whereas plant samples included shoots, roots, and rice grains (dehusked). Lastly, in this part, HCB in xylem saps was designed to be examined. The results showed that (1) the HCB translocation from paddy soil to rice by vaporization; (2) the HCB concentration in rice grains was surprisingly high; (3) the observed HCB decrease in rice rhizosphere offers a potential means for in situ HCB degradation; (4) HCB might not be transported along transpiration in rice.

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Partitioning and Bioavailability

2004

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As soon as a chemical is spilled it becomes a pollutant, but the fate of that pollutant depends to a large degree on its chemistry, which determines how it will partition to various “compartments,” or phases, of the environment. This idea is enshrined in risk‐based strategies for assessing contaminated land and water. In many cases a contaminant spill on land quickly becomes a water pollution issue, be it surface or groundwater. As many countries are heavily reliant on groundwater as a source of potable water, investigating the fate of pollutants is an essential prerequisite to any remedial action plan for contaminant cleanup. Partitioning is governed by some fundamental properties of chemicals, but partitioning should be viewed in relation to the toxicity of the chemical in question and its degradability in the various environmental compartments. In this article, the important properties of chemicals that relate to partitioning are examined, and the theory is reinforced by example. The examples chosen are benzene, phenol, and some chlorinated phenols. All of these compounds are important industrial chemicals. Bioavailability is a simple concept, but practically it is a complex issue that remains to be resolved. The bioavailability concept is also enshrined in the risk assessment approach to contaminated land and water. If a pollutant is present in soil or water in high concentration, but is not available to the biota, then surely it presents minimal risk. Regardless of the apparent simplicity of the concept, there is great urgency to find methods for quantifying bioavailability. Some approaches to solving this quandary are discussed.

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Use of sequential ASE extraction to evaluate the bioavailability of DDT and its metabolites to wheat roots in soils with various organic carbon contents

Cited by 51 publications

References 20 publications

Oxalate and root exudates enhance the desorption of p,p′-DDT from soils

Oxalate and root exudates enhance the desorption of p,p′-DDT from soils

Tracing the behaviour of hexachlorobenzene in a paddy soil-rice system over a growth season

Partitioning and Bioavailability

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