Mobility and persistence of the herbicide fomesafen in soils cultivated with bean plants using SLE/LTP and HPLC/DAD

Abstract

A method has been optimized and validated for the determination of fomesafen in soils using solid-liquid extraction with low-temperature partitioning (SLE/LTP) and analysis by liquid chromatography with a high-efficiency diode array detector (HPLC/DAD). The method was used to evaluate the persistence and mobility of this herbicide in different soils cultivated with bean plants. Recovery values were ≥98.9 %, with variations in the repeatability coefficients of ≤15 %, and a detection limit of 7.3 μg kg(-1). Half-life values of fomesafen were between 60 and 71 days in soil cultivated using a no-till system and 99 and 114 days in soil cultivated using a conventional tillage system. The mobility of fomesafen was moderate and mainly influenced by the organic matter content, pH, and soil type. In Red-Yellow Argisol, which has a higher content of organic matter, the leaching of fomesafen was less pronounced. In Red-Yellow Latosol, which has smaller amounts of organic matter and high pH, the leaching of fomesafen was more pronounced.

Effect of the Incorporation of Sugarcane Bagasse Biochar in Leaching and Bioavailability of Clomazone in Soil

“…The use of the highest volume of extraction solution promoted a significant increase in the method extraction performance. This result is in accordance with the work published by Costa et al 23 for analysis of fomesafen in different Brazilian soils.…”

“…The method using solid-liquid extraction with low-temperature partitioning (SLE/LTP) and analysis by HPLC with UV-Vis detection (HPLC-UV-Vis), proposed by Costa et al, 23 was optimized and validated for determination of CMZ in soil and biochar-amended soil.…”

Adsorption, desorption and persistence of fomesafen in soil

“…Fomesafen leaching was affected mainly by soil types, OM and soil pH in their study. 18 As indicated by the results of fomesafen laboratory incubation experiment from Porter et al, 35 fomesafen is relative persistent to microbial degradation with a DT 50 of ∼ 100 days in Tifton loamy sand. Considering that fomesafen is not readily degraded in this soil and LDPE mulch prevents water penetration directly during rainfall, it is reasonable to speculate that faster dissipation rates in bare ground plots were mainly caused by leaching and the physical movement of fomesafen deeper into the soil profile beyond sampling depth, rather than microbial degradation.…”

“…Fomesafen mobility was negatively related to soil OM, humic matter, pH and cation exchange capacity . Fomesafen was reported to have greater mobility in a Red–Yellow Latosol from Brazil, which has a lower OM content and higher pH, than a Red–Yellow Argisol used in the same study that contained higher soil OM . Although there is published research regarding fomesafen adsorption, desorption and soil mobility, limited data are available to indicate fomesafen soil adsorption and desorption, field persistence, and effect of different soil characteristics on fomesafen bioavailability to sensitive crops.…”

Development of a Methodology for the Determination of Pesticide Residues in Cajá-Manga Pulp (Spondias dulcisL.) Using Solid-Liquid Extraction with Low-Temperature Partitioning

“…e solid-liquid extraction with low-temperature partitioning (SLE-LTP) was used in this study because it is an efficient method in the extraction of pesticide residues from different samples [19][20][21][22][23][34][35][36][37] and, mainly, because it is an easy application method involving few steps and low consumption of solvents and sorbents compared to other extraction methods. e SLE-LTP was optimized for the extraction of pesticide residues from the cajá-manga pulp to obtain maximum recovery of the analytes.…”