Transport of rimsulfuron and its metabolites in soil columns

Martins, Jean M.F.; Mermoud, A.

doi:10.1016/s0045-6535(98)00197-0

Cited by 39 publications

(37 citation statements)

References 12 publications

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“…T he more recent herbicide formulations are designed to offer advantages of the highest selectivity together with the lowest persistence in the environment: sulfonylurea herbicides meet these requirements. But, unfortunately, lower persistence in the environment does not necessarily correspond to lower toxicity, since many herbicides undergo natural degradation reactions in the environment that do not lead to mineralization but to the formation of new species potentially more toxic and stable than the precursors [1][2][3][4][5]. The evaluation of the degradation pathway and the structures and toxicity of the degradation products is therefore of paramount importance.…”

mentioning

confidence: 99%

Hydrolytic and photoinduced degradation of tribenuron methyl studied by HPLC-DAD-MS/MS

Bottaro

Frascarolo

Gosetti

et al. 2008

J. Am. Soc. Mass Spectrom.

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The©paper©studies,©with©the©help©of©HPLC-DAD-MS/MS©technique,©the©hydrolytic©and photoinduced©degradation©processes©that©take©place©in©aqueous©solutions©of©tribenuron methyl,© both© when© preserved© in© the© dark© and© when© undergoing© solar© box© irradiation© under conditions© that© simulate© sun© light.© The© results© indicate© that© the© degradation© products© formed by© hydrolysis© alone© and© by© photoirradiation© are© the© same,© but© kinetics© of© the© hydrolysis reaction©is©much©slower.©The©degradation©products©are©identified©as©2-methoxy-4-methylamino-6-methyl-1,3,5-triazine© (P1),© methyl© 2-aminosulfonylbenzoate© (P2),© and© saccharin© (P3)© and© quantified.© Ecotoxicological© biotests© performed© on© 0.1© g L Ϫ1 photoirradiated solutions of the herbicide give a border line toxicity situation comparable to that of the precursor and indicate that the herbicide is characterized by low persistence in the environment, as required. Its degradation, however, does not lead to mineralization but to the formation of products of comparable toxicity. To evaluate the matrix effects, the photodegradation of the herbicide is also studied in the presence of rice paddy waters: the process is slower than in ultrapure water but leads to the same products. Experiments performed for comparison by irradiating ultrapure water solutions with UV lamp (254 nm) show that the degradation process is not only faster with respect to sunlight, but gives a different pathway, without in anyway leading to mineralization. T he more recent herbicide formulations are designed to offer advantages of the highest selectivity together with the lowest persistence in the environment: sulfonylurea herbicides meet these requirements. But, unfortunately, lower persistence in the environment does not necessarily correspond to lower toxicity, since many herbicides undergo natural degradation reactions in the environment that do not lead to mineralization but to the formation of new species potentially more toxic and stable than the precursors [1][2][3][4][5]. The evaluation of the degradation pathway and the structures and toxicity of the degradation products is therefore of paramount importance.The natural degradation of sulfonylurea herbicides takes place through aqueous hydrolysis reactions [6 -8], microbial processes (mainly occurring in soils) [9 -11], or photodegradation reactions [1-3, 5, 12-14]. These processes in surface waters and in soil are concomitant [7,15,16].HPLC-DAD-MS/MS methods are employed here to investigate and compare the hydrolytic and photoinduced degradation pathways of aqueous solutions of tribenuron methyl (methyl [2-4-methoxy-6-methyl-1,3,5-triazin-2-yl(methyl)carbamoyl sulfamoyl]benzoate) (Scheme 1), largely used against broad-leaved weeds in crops of cereals and in particular of rice.TiO 2 assisted photodegradation often leads to complete mineralization and can be used to dissipate pollutants in remediation strategy [17][18][19][20]. We are interested here to study the natural photodegradation of tribenuron methyl in...

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confidence: 99%

Hydrolytic and photoinduced degradation of tribenuron methyl studied by HPLC-DAD-MS/MS

Bottaro

Frascarolo

Gosetti

et al. 2008

J. Am. Soc. Mass Spectrom.

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“…Ci. Solo, 32:2165-2175 autores, evidenciando aumento na dispersividade de substâncias químicas adsorvidas quando comparadas com as conservativas (Martins & Mermoud 1999;Vanderborght et al, 2002;Pot et al, 2005).…”

Section: Resultsunclassified

“…Como nos ensaios realizados com o KBr como traçador foi constatada a ausência do não-equilíbrio físico, pode-se, nesse caso, descartar sua influência nas curvas de eluição do PBZ, sendo, portanto, o solo influenciado apenas pelo não-equilíbrio devido à sorção. Comportamento similar ao do PBZ foi observado para outras moléculas em colunas homogêneas de solo (Lee et al, 1988;Gaber et al, 1995;Fortin et al, 1997;Beigel & Di Pietro, 1999;Martins & Mermoud, 1999). O não-equilíbrio químico foi constatado, isto é, uma cinética de sorção no transporte do PBZ, por meio da técnica de interrupção de fluxo (Martins, 1993;Brusseau et al, 1997).…”

Section: Resultsunclassified

“…Sabendo-se que a interação do PBZ é preponderantemente com a MO e que os solos possuem praticamente o mesmo teor de MO, os baixos valores de K d obtidos para o Vertissolo Háplico podem ser devido à dificuldade de acesso do PBZ à matéria orgânica, pois esta encontra-se formando microagregados nesse solo (Milfont, 2006). A não-recuperação total do PBZ fez com que fosse adotada no modelo CDE a dois sítios de sorção uma taxa de desaparecimento do PBZ, por intermédio do termo μ 1 (taxa de degradação) (Beigel & Di Pietro, 1999;Martins & Mermoud, 1999). O modelo CDE a dois sítios de sorção descreveu adequadamente as curvas de eluição do PBZ, com coeficientes de determinação acima de 0,97 independentemente do solo e da vazão considerada (Quadro 4).…”

Section: Resultsunclassified

“…Os dispositivos experimentais e as realizações dos ensaios foram amplamente utilizados em trabalhos anteriores (Gaudet et al, 1977;Seyfried & Rao, 1987;Martins, 1993;Martins & Mermoud, 1999). O dispositivo experimental utilizado para o estudo de transferência de solutos sob condição de saturação foi composto por colunas de solo em acrílico com 20 cm de comprimento e 5,05 cm de diâmetro interno; uma bomba peristáltica com 12 canais de marca Ismatec; um barrilete de 20 L de solução iônica; recipiente contendo o traçador KBr 0,1 mol L -1 ; três válvulas de três vias; um coletor de frações de marca ISCO RETRIEVER com capacidade para 116 tubos, para trabalhar com quatro colunas de solo simultaneamente; um condutivímetro digital de marca Digimed DM-31, para leitura das medidas de condutividade elétrica das soluções efluentes; capilares de borracha flexíveis com 2,38 mm de diâmetro interno; e balanças digitais, para determinar a massa de solução deslocadora aplicado nas colunas de solo.…”

Section: Procedimento Experimentalunclassified

See 2 more Smart Citations

Transporte do paclobutrazol em colunas de solos

Milfont¹,

Antonino²,

Martins³

et al. 2008

Rev. Bras. Ciênc. Solo

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Degradation Processes of Pesticides Used in Potato Cultivations

Kurek

Barchańska

Turek

2016

Reviews of Environmental Contamination and Toxicology

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Potato is one of the most important crops, after maize, rice and wheat. Its global production is about 300 million tons per year and is constantly increasing. It grows in temperate climate and is used as a source of starch, food, and in breeding industry.Potato cultivation requires application of numerous agro-technical products, including pesticides, since it can be affected by insects, weeds, fungi, and viruses. In the European Union the most frequently used pesticides in potato cultivations check are: thiamethoxam, lambda-cyhalothrin and deltamethrin (insecticides), rimsulfuron (herbicide) and metalaxyl (fungicide).Application of pesticides improves crop efficiency, however, as pesticides are not totally selective, it affects also non-target organisms. Moreover, the agrochemicals may accumulate in crops and, as a consequence, negatively influence the quality of food products and consumer health. Additional risks of plant protection products are related to their derivatives, that are created both in the environment (soil, water) and in plant organisms, since many of these compounds may exhibit toxic effects.This article is devoted to the degradation processes of pesticides used in potato crop protection. Attention is also paid to the toxicity of both parent compounds and their degradation products for living organisms, including humans. Information about the level of pesticide contamination in the environment (water, soil) and accumulation level in edible plants complement the current knowledge about the risks associated with widespread use of thiamethoxam, lambda-cyhalothrin and deltamethrin, rimsulfuron and metalaxyl in potato cultivation.

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Transport of rimsulfuron and its metabolites in soil columns

Cited by 39 publications

References 12 publications

Hydrolytic and photoinduced degradation of tribenuron methyl studied by HPLC-DAD-MS/MS

Hydrolytic and photoinduced degradation of tribenuron methyl studied by HPLC-DAD-MS/MS

Transporte do paclobutrazol em colunas de solos

Degradation Processes of Pesticides Used in Potato Cultivations

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