Interaction of atrazine with Laurentian fulvic acid: binding and hydrolysis

Zhendi, Wang; Gamble, Donald S.; Langford, Cooper H.

doi:10.1016/s0003-2670(00)81234-9

Cited by 45 publications

(29 citation statements)

References 13 publications

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“…The first is that not all of the sorption was instantaneous. Several authors have reported that sorption and desorption of pesticides by soils can be slow, so that sorption-desorption kinetics should be accounted for (7,27,(41)(42)(43). The data presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The early approach to sorption equilibrium was used for the calculation of sorption and desorption rate constants. soil interactions (1,(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31). The extent to which the extractable iron and aluminum of this New Brunswick soil might be blocking carboxyl or clay sorption sites is unknown.…”

Section: Kinetics Chemical Speciation Experimentsmentioning

confidence: 99%

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Atrazine in mineral soil: the analytical chemistry of speciation

Gamble¹,

Ismaily²

1992

Can. J. Chem.

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The HPLC–microfiltration method previously described for determining atrazine and hydroxyatrazine species in organic soil has been adapted to a mineral soil. The method was able to monitor atrazine concentrations of less than 1.0 × 10−6 M, which is over 40 times lower than the atrazine concentrations measured in the earlier organic soil experiments. During kinetics.experiments, it also monitored four free and sorbed chemical species instead of only one. Measurements were obtained with much better accuracy and productivity than can be obtained by conventional methods. The atrazine sorption capacity of the mineral soil was also measured. The analytical chemical data produced can support heterogeneous chemical kinetics calculations.

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Section: Resultsmentioning

confidence: 99%

Section: Kinetics Chemical Speciation Experimentsmentioning

confidence: 99%

Atrazine in mineral soil: the analytical chemistry of speciation

Gamble¹,

Ismaily²

1992

Can. J. Chem.

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“…Moreover, acid hydrolysis may occur in degradation of atrazine at low pH. This process is strongly pH-dependent, since hydrolysis of atrazine was observed only at pH up to 3.65 in water solution with fulvic acids (Wang et al 1990). However, Comber (1999) observed slow atrazine hydrolysis also at pH 4.…”

Section: Degradation Of Atrazine By Nano Zvimentioning

confidence: 99%

Remediation of Atrazine-contaminated Soil and Water by Nano Zerovalent Iron

Satapanajaru

Anurakpongsatorn

Pengthamkeerati

et al. 2008

Water Air Soil Pollut

132

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Atrazine-contaminated soil may require remediation to mitigate ground and surface water contamination. We determined the effectiveness of nano zerovalent iron (nano ZVI) to dechlorinate atrazine (2-chloro-4ethylamino-6-iso-propylamino-1,3,5-triazine) in contaminated water and soil. This study determined the effects of iron sources, solution pH, Pd catalyst and presence of Fe or Al sulfate salts on the destruction of atrazine in water and soil. Our results indicate nano ZVI can be successfully used to remediate atrazine in water and soil. Aqueous solution of atrazine (30 mg l −1 ) was treated with 2% (w/v) of nano ZVI and 5% (w/v) of commercial ZVI. Although, iron dose in nano ZVI treatment was less than that in commercial ZVI treatment, atrazine destruction kinetic rate (k obs ) of nano ZVI treatment (1.39 days −1 ) was around seven times higher than that of commercial ZVI treatment (0.18 days −1 ). Reductive dechlorination was the major process in destruction of atrazine by nano ZVI. The dechlorination product was 2-ethyl-amino-4-isopropylamino-1,3,5-triazine. Lowering the pH from 9 to 4 increased the destruction kinetic rates of atrazine by nano ZVI. Moreover, nano ZVI/Pd enhanced destruction kinetic rates of atrazine (3.36 day −1 ). Pd played the important role as a catalyst during treatment of atrazine by nano ZVI. Atrazine destruction kinetic rates were greatly enhanced in both contaminated water and soil treatments by nano ZVI when sulfate salts of Fe(II), Fe(III) or Al(III) was add with the following order of removal rates: Al (III) (2.23 day −1 ) > Fe (III) (2.04 day −1 ) > Fe(II) (1.79 day −1 ). The same results were found in atrazine-nano ZVI-soil incubation experiments.

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“…However, although U-18 sample had a greater carbon content when compared with U-30 sample, U-18 sample had smaller K d value for atrazine. Wang et al [11,12] had pointed out that soil humic acid had much greater sorption capac- ity for atrazine when compared with fulvic acid. The higher K d value in U-30 sample than in U-18 sample could result from its higher humic acid.…”

Section: Sorption Isothermsmentioning

confidence: 99%

“…When atrazine was released to the soils, several mechanisms determine the environment fates of atrazine, including adsorption, hydrolysis, and biodegradation. It has been observed that there is a positive correlation between the sorption of atrazine and soil organic matter content [8,9], although several researchers have pointed out that the types of organic matter could have significant impacts on the adsorption of atrazine [10][11][12][13][14]. Organic matter does not only contribute to the sorption of atrazine, but it also plays an important role in the catalytic transformation of atrazine to hydroxyatrazine [15,16].…”

Section: Introductionmentioning

confidence: 99%