Degradation of the herbicide propanil in distilled water

Dahchour, Abdelmalek; Bitton, Gabriel; Coste, Camille; Bastide, J.

doi:10.1007/bf01623551

Cited by 21 publications

(13 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…No 3,4 DCA was detected up to 100 DAT. These results showed a lack of chemical degradability under laboratory conditions, as reported by other authors (Dahchour et al, 1986; El Dib and Aly, 1976a, 1976c).…”

Section: Discussionsupporting

confidence: 91%

“…Outside the scope of this experiment, but worthy of mention, is that the amount of propanil in water is also related to the existence of rice foliage at the time of propanil distribution. Given that rice is naturally resistant to propanil via the activity of the enzyme aryl acylamidase (Correa and Steen, 1995; Dahchour et al, 1986), an important quantity of propanil is intercepted by rice leaves and rapidly degraded by the plants.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Dissipation of Propanil and 3,4 Dichloroaniline in Three Different Rice Management Systems

et al. 2012

View full text Add to dashboard Cite

This study focused on the dissipation of propanil and 3,4 dichloroaniline (3,4 DCA) over time in the soil, field water, inlet water, and outlet water of paddy fields under three management systems: conventional water seeding (CON), conventional water seeding with supplied liquid manure (LMA), and dry seeding (DRY). Propanil dissipation in water was also investigated under laboratory conditions. The field study was conducted from 2004 to 2006 at Vercelli, northern Italy. Propanil and 3,4 DCA showed rapid dissipation in water and soil environments both in the field and in the laboratory. Under controlled conditions, chemical hydrolysis was not detected for either compounds for up to 100 d at pHs of 5, 7, and 9. In the laboratory, the half-life of propanil in irrigation water was 1.1 d; its half-life in soil was routinely measured at <1.0 d (between 0.17 and 1.77 d). 3,4 DCA was found to persist much longer. Measured in all three study years at 50 d after treatment, its concentration ranged between 44 μg kg (CON) and 140 μg kg (DRY). Propanil and 3,4 DCA concentrations in paddy water were particularly high in samples collected at 4 d (2004) and 2 d (2005) after treatment. Maximum concentrations were 54.4 μg L (CON) for propanil (2005) and 113.7 μg L (LMA) for 3,4 DCA (2004). The concentrations of propanil and 3,4 DCA in inlet water were never above 1.1 and 0.3 μg L, respectively, whereas the highest concentration of each compound in outlet water was in samples collected first after treatment in 2005 and 2006. Both chemicals dissipated rapidly in all the soil-water environments but displayed no important differences among the three management systems. In conclusion, propanil and 3,4 DCA did not persist longer in paddy fields. A risk of water network contamination by these compounds may occur only early after herbicide spraying. A water-holding period after herbicide spraying may reduce this risk.

show abstract

Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Dissipation of Propanil and 3,4 Dichloroaniline in Three Different Rice Management Systems

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Liquid chromatography has also been used (11,12,18). MS detection has not been reported up till now.…”

Section: Introductionmentioning

confidence: 98%

Rapid Degradation of Propanil in Rice Crop Fields

Santos

Rocha

Alonso

et al. 1998

Environ. Sci. Technol.

View full text Add to dashboard Cite

Propanil and its major degradation product, 3,4-dichloroaniline (DCA), were monitored in surface water and soil samples from two rice fields of the Ebre Delta area (Tarragona, Spain) following agricultural application. On-line solidphase extraction (SPE) (water) and Soxhlet extraction (soil) followed by liquid chromatography/diode array detection (LC/ DAD) were used for the trace determination of both compounds. Unequivocal confirmation/identification was conducted by using liquid chromatography/atmospheric pressure chemical ionization-mass spectrometry, LC/APCI-MS (using negative and positive ionization modes). Concentrations of the herbicide propanil in water samples varied from 1.9 to 55.9 µg/L. Propanil degraded very rapidly to DCA, and high concentrations of this product were found, varying from 16.5 to 470 µg/L in water and 119 ( 22 µg/kg in soil samples. No detectable DCA (<0.001%) was found in the applied pesticide formulation, indicating that DCA formation took place after propanil application. These field results compared favorably with laboratory experiments showing that humic interactions had a strong influence on the pesticide degradation. The half-lifes under real conditions for propanil and DCA, calculated using a first-order decay, were 1.2 and 1.6 days, respectively.

show abstract

“…9 According to Barceló et al 10 propanil was also one of the most used in Ebre Delta wetland area (Tarragosa, Spain) and, according to Coupe et al, 11 it was extensively used in the Mississipi Delta area (USA). Various studies 10,[12][13][14][15] have verified that the herbicide propanil is degraded quickly into 3,4-dichloroaniline (3,4-DCA), presented in Figure 1B, CAS RN 95-76-1.…”

Section: Introductionmentioning

confidence: 99%