Abstract
The use of pesticides in agriculture is one of the current problems that may result in contamination of both ground and surface water and groundwater. Considering the environmental importance and the increasing use of herbicides in Maringá region, in the present work methods for extraction and determination of glyphosate (GLYP) and aminomethylphosphonic acid (AMPA) using solid phase extraction (SPE) and high performance liquid chromatography (HPLC) were developed. For SPE, anion exchange resin was used and elution was done with hydrochloric acid 50.0 mmol L-1, achieving recovery rates of 82.5-116.2% and 67.1-104.0% for AMPA and GLYP, respectively. For HPLC determination the analytes were derivatized and injected in the HPLC with a C18 column and using mobile phase consisting of phosphate buffer 0.20 mol L-1 at pH 3.0 and acetonitrile (85:15); the monitoring was done at 240 nm. The analysis was performed in 8 min with the same limit of detection and limit of quantification for AMPA and GLYP of 0.09 and 0.20 mg L-1, respectively. The methods were applied to analysis of public water supply samples and concentrations from 2.1 up to 2.9 µg L-1 for AMPA and from 2.3 up to 3.3 µg L-1 for glyphosate were found.
Highlights
The use of pesticides in agriculture is one of the current problems that may result in contamination of both ground and surface water and groundwater
Technology furnished to people and, the determination of contaminants as pesticides should be done to verify if them were eliminated during the water treatment step (DI BERNARDO; DANTAS, 2005)
The resin Dowex AG1X8-100 with a quaternary trimethylammonium exchange group and chloride as counter ion was selected for extraction and concentration of GLYP and aminomethylphosphonic acid (AMPA) and, the pH should be optimized to permits to maximum analytes retention as AMPA and GLYP may have positive and negative charge depending on pH
Summary
The use of pesticides in agriculture is one of the current problems that may result in contamination of both ground and surface water and groundwater. This contamination stems from the action of rainwater and irrigation water that can carry these compounds and take them to rivers and lakes that are used in cities for water supply (LIPOK et al, 2010). With this water uptake for human consumption it is necessary a stringent control to verify the potability of the water.
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