Use of synergistic extraction for the study of atrazine/metal interactions

Martin, Manuela; Hagège, Agnès; Brunette, J.P.; Leroy, M. J. F.

doi:10.1016/s0003-2670(98)00384-5

Cited by 23 publications

(24 citation statements)

References 6 publications

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“…In fact, atrazine contains five electron-donor atoms that could potentially participate in the formation of metal/atrazine complexes. Previous studies (Martin et al, 1998;Meng and Carper, 2000) showed that Ca, Mg, Pb, Zn, Cd, and Cu can complex with both monomeric and dimeric atrazine in both anhydrous and hydrated forms (with one or two water molecules). The effect of atrazine-metal complexation on the plant uptake of atrazine and metals must be taken into account to address the biogeochemical cycle of pollutants, since these metals are ubiquitous.…”

Section: Introductionmentioning

confidence: 99%

Interaction between cadmium and atrazine during uptake by rice seedlings (Oryza sativa L.)

Zhu

Lin

et al. 2005

Chemosphere

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The uptake of atrazine by rice seedlings (Oryza sativa L.) through plant roots from nutrient solution was investigated in the presence and absence of Cd 2+ over an exposure period of four weeks. It was found that both atrazine and Cd 2+ were toxic to rice seedlings. Both shoot and root biomasses decreased when the seedlings were exposed to increasing atrazine or Cd 2+ concentrations in nutrient solutions. In the absence of Cd 2+ , a linear relationship was observed between atrazine concentrations in roots/shoots and in external solution, and more atrazine is concentrated in roots than in shoots. When atrazine and Cd 2+ concentrations in solution were maintained at mole ratio of 1:1, the accumulation of atrazine by seedlings was less and the seedling biomass was greater than found with other ratios, such as 1:2 or 2:1. Therefore, the formation of the complex between atrazine and Cd 2+ reduced the individual toxicities. Analyses of data with the quasi-equilibrium partition model indicated that the atrazine concentrations in rice seedlings and external water were close to equilibrium. In the presence of Cd 2+ , however, the measured bioconcentration factor (BCF) of atrazine with roots and shoots were considerably greater. The latter findings resulted presumably from the atrazine-Cd 2+ complex formation that led to a large apparent BCF.

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Section: Introductionmentioning

confidence: 99%

Interaction between cadmium and atrazine during uptake by rice seedlings (Oryza sativa L.)

Zhu

Lin

et al. 2005

Chemosphere

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“…The results suggest that ATR was metabolized rapidly in seedling roots while engaged in specific binding in shoots. Martin et al [20] and Meng and Carper [21] showed that certain metal ions, such as Ca 2+ , Mg 2+ , Pb 2+ , Zn 2+ , Cd 2+ , and Cu 2+ , bind effectively with both monomeric and dimeric ATR to form both anhydrous and hydrated complexes. This complex formation of ATR with metal ions is attributed to the strong electron-donating power of ATR.…”

Section: Live Plant Uptake: Atr Alonementioning

confidence: 99%

Effects of exposure time and co-existing organic compounds on uptake of atrazine from nutrient solution by rice seedlings (Oryza sativa L.)

Zhu

Lin

et al. 2007

Journal of Hazardous Materials

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Root uptake of atrazine (ATR) by rice seedlings (Oryza sativa L.) from nutrient solution was investigated with exposure periods of 48, 96, and 240 h. A similar ATR uptake was carried out with two co-existing organic compounds (o-chlorophenol (CP) and 2,4-dichlorophenol (DCP)) with 48 h exposure. In contact with the seedlings, the ATR level in nutrient solution decreased sharply during the early exposure and then reached relatively steady levels after 48 h. It was observed that the ATR levels within whole seedlings approached the estimated equilibrium partition limits in about 48 h, according to the partition-limited model utilizing the measured plant water and organic matter contents and the ATR partition coefficients with whole seedlings. However, when roots and shoots were consisted separately, the detected ATR levels in roots were lower than estimated equilibrium limit while the levels in shoots exceeded the equilibrium limit. The data with roots suggested the occurrence of rapid ATR degradation in roots. The results with shoots are intrinsically consistent with the suggested complex formation of ATR with free metal ions in shoots. The ATR levels in roots and shoots varied to a moderate extent when the seedlings were exposed to different levels of ATR-CP-DCP mixtures. The variation results presumably from the interference of coexisting CP and DCP and the phytotoxicity of the mixed chemicals.

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“…ATR is known to bind with certain metal ions (e.g., Mg 2+ , Cd 2+ , and Pb 2+ ) [14,15], and is thus able to interrupt the plant photosynthesis by acting as an electron acceptor in the electron-transfer process. Therefore, the uptake of ATR by plant shoots may be enhanced by some active metal ions in plant leaves in addition to its passive uptake by the plant organic matter [27].…”

Section: Atrazine Uptakementioning

confidence: 99%

“…Whereas Hg 2+ is not recognized as an active metal to bind ATR [14,15], it is known to inhibit water uptake via aquaporins on plasma membranes in higher plants [21]. Considering the plant's passive uptake of organic compounds from external water [13], we hypothesize that Hg 2+ in external water may inhibit the uptake of ATR, if it signiWcantly inhibits the water Xow.…”

Section: Introductionmentioning

confidence: 98%

“…It was found that the uptake of ATR and coexisting organic compounds by rice seedlings (e.g., chlorophenol and dichlorophenol) is largely unaVected by coexisting compounds [12] and appears to proceed essentially by passive (i.e., partition) mechanism, as evaluated by a partitionlimited model [13]. By contrast, the ATR uptake is enhanced by coexisting Cd 2+ or Pb 2+ ion [11] because of the ATR-ion binding [14,15]. Thus, the ATR uptake by plants in the presence of metal ions might become very complicated because of its potential metal-binding capability in addition to its passive-uptake process.…”

Section: Introductionmentioning

confidence: 99%

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