Sorption−Desorption of Imidacloprid and Its Metabolites in Soils

Cox, L.; Koskinen, William C.; Yen, Pau Yong

doi:10.1021/jf960514a

Cited by 171 publications

(141 citation statements)

References 10 publications

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“…The extent of hysteresis can be obtained for every set of adsorption and desorption isotherms using the hysteresis coefficient H (Cox et al, 1997). The H value was calculated as:…”

Section: Resultsmentioning

confidence: 99%

Time and temperature dependent sorption behaviour of dimethoate pesticide in various Indian soils

Rani¹,

Sant²

2014

International Agrophysics

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A b s t r a c t. Experiments were conducted to study the sorption behaviour of dimethoate in three Indian soils at different temperatures. A kinetic study showed that adsorption equilibrium was reached within 15 h at different initial levels of pesticide concentration. Applicability of the pseudo second order kinetic model suggested that the adsorption process was complex and several mechanisms were involved. The Freundlich model explained the adsorption behaviour adequately and the isotherms were of S-type. The adsorption process was found to be strongly affected by temperature. The Gibbs free energy change, ΔGº values (from -15.81 to -16.60 kJ mol -1 ) indicated that the process was spontaneous and exothermic in nature. The change in enthalpy of adsorption, ΔH° values (from -17.729 to -21.539 kJ mol -1 ) suggested that relatively weak H-bond forces were the main driving forces for adsorption. Desorption was found to be concentration-and temperature-dependent with higher desorption occurring at higher temperature and concentration levels. The results signify the importance of temperature in controlling the mobility of dimethoate in water bodies.K e y w o r d s:

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“…The extent of hysteresis can be obtained for every set of adsorption and desorption isotherms using the hysteresis coefficient H (Cox et al, 1997). The H value was calculated as:…”

Section: Resultsmentioning

confidence: 99%

Time and temperature dependent sorption behaviour of dimethoate pesticide in various Indian soils

Rani¹,

Sant²

2014

International Agrophysics

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“…Desorption hysteresis index (HI) was calculated as the ratio between 1/n d and 1/n s (Cox et al 1997).…”

Section: Methodsmentioning

confidence: 99%

Retention characteristics of acetochlor in soils collected from different depths in relation to soil properties (Žitný ostrov area, SW Slovakia)

Tatarková¹,

Hiller²,

Halko³

2014

Soil & Water Res.

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Tatarková V., Hiller E., Halko R. (2014): Retention characteristics of acetochlor in soils collected from different depths in relation to soil properties (Žitný ostrov area, SW Slovakia). Soil & Water Res., 9: 58-65.Determination of the sorption-desorption of herbicides within soil profile is one of the first steps in predicting their leaching potential. Batch experiments were performed to evaluate the influence of soil properties on acetochlor retention. Soil samples were taken from horizons A, B, and C of three soil types representative of the Žitný ostrov area. The sorption and desorption isotherms were fitted to the Freundlich equation. The Freundlich sorption coefficient (K fs ) values ranged from 0.71 to 6.58 mg(1-1/n) .l (1/n) /kg and were correlated positively with soil organic carbon, humic and fulvic acid carbons, amorphous aluminum oxides, and negatively with soil pH. The Freundlich desorption coefficient (K fd ) values were greater than those for sorption, showing that not all acetochlor sorbed was desorbed after four washing steps. The percentage of acetochlor desorbed ranged from 7.80 to 54.5% with decreased desorption from soil horizons B and C. The higher sorption capacity of surficial soil horizons in the three soils may be a limiting factor for penetration of acetochlor through soil profiles into groundwater.

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“…od početne količine pesticida koja je uneta u sistem zemljište/rastvor, može se uzeti da su nezavisno od koncentracije pesticida, zauzeti uglavnom samo visokoenergetski sorpcioni centri zemljišta. Ukoliko se sa druge strane dobije da, na primer, H opada sa povećanjem količine sorbovanog pesticida (povećanje početne količine pesticida unete u sistem zemljište/voda), može se uzeti da su visokoenergetski sorpcioni centri zemljišta popunjeni samo pri većim koncentracijama pesticida (Cox, 1997;Pusino i sar., 2004). Uzimajući u obzir heterogenost adsorpcionih zemljišnih centara, model (jednači-na (8)) za opisivanje desorpcionog procesa uzima da se količina sorbovanog analita sastoji iz dve frakcije molekula adsorbata: prva frakcija se lako desorbuje (term k 1 .…”

Section: Adsorpcija Pesticida Za Zemljišteunclassified

The processes that determine the fate of pesticides in soil

Djurovic¹

2011

PESTIC PHYTOMED

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REZIMEPesticidi su neizostavni deo životne sredine, jer se usled intenzivne primene njihovi ostaci često detektuju u prirodi, naročito u zemljištu. Bez obzira na koji način dospeju u zemljište, njihova dalja sudbina će zavisiti od mnoštva faktora. Uzimajući u obzir složenost interakcija pesticida i zemljišta, kao i činjenicu da je intenzitet interakcija istog jedinjenja sa različitim zemljištima različit, sve su brojnija ispitivanja uticaja najvažnijih zemljišnih parametara u pomenutim interakcijama.U ovom radu su predstavljeni procesi koji određuju sudbinu pesticida u zemljištu, kao i faktori koji utiču na te procese. Poseban osvrt je stavljen na adsorpcione procese, s obzirom da oni određuju koncentraciju slobodne frakcije molekula pesticida, tj. količine pesticida koja može da učestvuje u detoksifikacionim procesima u koje spadaju procesi degradacije i kretanja. UVODPesticidi, koji predstavljaju veoma značajnu grupu agrohemikalija, pored koristi, donose sa sobom i neke neželjene posledice. U sagledavanju ovih štetnih efekata, centralno mesto zauzima opasnost od zagađenja ži-votne sredine (Đurović i Đorđević, 2010a; 2010b; Marković i sar., 2010).Pod sudbinom pesticida u životnoj sredini podrazumevaju se procesi kretanja i transformacije, od kojih su zbog potencijalne dužine trajanja i efekata koje mogu proizvesti, najznačajniji oni koji se dešavaju u zemljištu. Bez obzira da li u zemljište dospevaju direktnom primenom ili na indirektan način, dalja sudbina pesticida u ovom matriksu će zavisiti od međusob-nog dejstva niza složenih fizičko-hemijskih procesa. Ispitivanja u ovoj oblasti imaju za cilj, pre svega, dobijanje podataka koji omogućavaju procenu opasnosti, tj. rizika od primene pesticida. S obzirom da adsorpcioni procesi indirektno određuju i koncentraciju pesticida koja može da učestvuje u procesima degradacije i kretanja, ispitivanja u ovoj oblasti su, pre svega, usmerena na određivanje adsorpcionih konstanti i adsorpciono/desorpcionih izotermi, koje omogućavaju i utvrđivanje fizičko-hemijskih karakteristika zemljišta najodgovornijih za retenciju ispitivanih pesticida u zemljištu, odnosno za njihovo ispiranje po profilu zemljišta.

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Sorption−Desorption of Imidacloprid and Its Metabolites in Soils

Cited by 171 publications

References 10 publications

Time and temperature dependent sorption behaviour of dimethoate pesticide in various Indian soils

Time and temperature dependent sorption behaviour of dimethoate pesticide in various Indian soils

Retention characteristics of acetochlor in soils collected from different depths in relation to soil properties (Žitný ostrov area, SW Slovakia)

The processes that determine the fate of pesticides in soil

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