Determination of triazine herbicides in water by micellar electrokinetic capillary chromatography

Martínez, R. Carabias; Rodríguez‐Gonzalo, Encarnación; Domínguez, Alba; Álvarez, Javier Domínguez; Méndez, J. Hernández

doi:10.1016/0021-9673(95)00978-7

Cited by 43 publications

(11 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, Nmethylcarbamates had previously been separated at pH 7.0 using a phosphate buffer [29,30], triazines in a borate buffer (pH 9.2) [25], and phenoxy acid herbicides in ammonium acetate buffer (pH 4.6) [21]. In other cases, the pH must be more strictly set in order to avoid undesirable reactions such as the hydrolysis of N-methylcarbamates in alkaline media.…”

Section: Influence Of Variables Affecting Separation Of Analytes By Mekcmentioning

confidence: 99%

“…With this technique, the separation of neutral compounds is realized on the basis of their differential affinity for the micellar pseudostationary phase. In recent years, application of this new technique to pesticide analysis has also been receiving attention, especially for the separation and determination of different types of herbicides such as phenoxy acids [21±23] and triazines [24,25]. With regard to NMC pesticides, the analysis of individual carbamates in different pesticide mixtures has been the subject of sporadic work [26±28]; also, only two recent papers about the separation and determination of NMC pesticides by MEKC appear to exist [29,30].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multi-residue analysis ofN-methylcarbamate pesticides and their hydrolytic metabolites in environmental waters by use of solid-phase extraction and micellar electrokinetic chromatography

1999

View full text Add to dashboard Cite

A method for the simultaneous separation and determination of N‐methylcarbamate pesticides and their hydrolytic metabolites by micellar electrokinetic chromatography (MEKC) was developed. A mixture of five pesticides (carbaryl, propuxur, carbofuran, aminocarb, and methiocarb) and their corresponding phenols was studied to optimize the separation of its components in terms of various electrophoretic parameters such as buffer type, pH and concentration, sodium dodecyl sulfate concentration, injection conditions, and applied voltage. Excellent separation of all ten analytes was achieved within about 20 min. The optimized method was used for determinations in environmental water samples. Sample volumes of 250 mL were first preconcentrated in the pesticides and metabolites by passage through a LiChrolut EN sorbent column and then further enriched by on‐column stacking. Dynamic ranges of 40 ng/L — 6 μg/L, limits of detection at the nanogram‐per‐liter level, and relative standard deviations from 2.6 to 7.4% were obtained. The proposed method surpasses high‐performance liquid chromatography (HPLC) in separation efficiency. In fact, it provides more expeditious separations and allows more flexible adjustment of the selectivity. Also, it enables the quantification for the analytes studied in this work with decreased limits of detection.

show abstract

Section: Influence Of Variables Affecting Separation Of Analytes By Mekcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-residue analysis ofN-methylcarbamate pesticides and their hydrolytic metabolites in environmental waters by use of solid-phase extraction and micellar electrokinetic chromatography

1999

View full text Add to dashboard Cite

show abstract

“…7.0 and 9.2, respectively) [29,34]. Based on this and on the chemical structure of the fungicides studied, it was reasonable to attempt their MEKC separation at pH 7.0, provided by a phosphate buffer.…”

Section: Effect Of Variables Affecting Separationmentioning

confidence: 99%

Rapid determination of fungicides in fruit juices by micellar electrokinetic chromatography: Use of organic modifiers to enhance selectivity and on-column high-salt stacking to improve sensitivity

Molina

Silva

2000

Electrophoresis

View full text Add to dashboard Cite

A rapid, reliable method for the multiresidue analysis of eight commonly used fungicides by micellar electrokinetic chromatography (MEKC) was developed. Excellent separation of the eight fungicides (carbendazim, metalaxyl, captan, procymidone, folpet, captafol, vinclozolin and iprodione) is achieved within about 10 min by using optimized electrophoretic conditions that include the addition of a mixture of organic modifiers to the running buffer for improved resolution. The sensitivity of the method is enhanced by using an enrichment step that involves on-column high-salt stacking. Limits of detection in the microgram-per-liter region and relative standard deviations from 2.1 to 5.9% are thus obtained for the fungicides without detracting from peak resolution. These results reveal that the high-salt stacking method provides highly improved sensitivity and enables highly flexible adjustment of the selectivity of the separation method. Also, the method surpasses other stacking alternatives used in MEKC and affords routine analyses of fruit juice containing fungicides at trace levels following a straightforward sample treatment. The robustness of the high-salt stacking method as demonstrated in this work makes MEKC methods involving stacking procedures an attractive choice for routine analyses.

show abstract

“…Furthermore the complexity of environmental matrices and large variations in physical and chemical properties of the target compounds requires the use of sensitive and selective techniques. Several analytical techniques, such as high-performance liquid chromatography (HPLC) [ 16 , 17 ], gas chromatography (GC) [ 18 , 19 ], micellar electrokinetic chromatography (MEKC) [ 20 , 21 ], enzyme-linked immunosorbent assays (ELISA) [ 22 – 24 ], and gas and liquid chromatography coupled to mass spectrometry (GC/MS, LC-MS) [ 25 , 26 ], have been used for analyses of pesticides in different matrices. The chromatographic techniques combine separation capabilities with sensitivity from the mass systems such as ion trap (IT), triple quadrupole (QqQ), and time of flight (TOF).…”

Section: Introductionmentioning

confidence: 99%

A Simple and Quick Method for the Determination of Pesticides in Environmental Water by HF-LPME-GC/MS

Menezes

Paulo

Paiva

et al. 2016

Journal of Analytical Methods in Chemistry

View full text Add to dashboard Cite

This paper describes a simple and quick method for sampling and also for carrying out the preconcentration of pesticides in environmental water matrices using two-phased hollow fiber liquid phase microextraction (HF-LPME). Factors such as extraction mode, time, solvents, agitation, and salt addition were investigated in order to validate the LPME method. The following conditions were selected: 6 cm of polypropylene hollow fiber, ethyl octanoate as an acceptor phase, and extraction during 30 min under stirring at 200 rpm. The optimized method showed good linearity in the range of 0.14 to 200.00 μg L−1; the determination coefficient (R 2) was in the range of 0.9807–0.9990. The LOD ranged from 0.04 μg L−1 to 0.44 μg L−1, and LOQ ranged from 0.14 μg L−1 to 1.69 μg L−1. The recovery ranged from 85.17% to 114.73%. The method was applied to the analyses of pesticides in three environmental water samples (a spring and few streams) collected in a rural area from the state of Minas Gerais, Brazil.

show abstract

Determination of triazine herbicides in water by micellar electrokinetic capillary chromatography

Cited by 43 publications

References 41 publications

Multi-residue analysis ofN-methylcarbamate pesticides and their hydrolytic metabolites in environmental waters by use of solid-phase extraction and micellar electrokinetic chromatography

Multi-residue analysis ofN-methylcarbamate pesticides and their hydrolytic metabolites in environmental waters by use of solid-phase extraction and micellar electrokinetic chromatography

Rapid determination of fungicides in fruit juices by micellar electrokinetic chromatography: Use of organic modifiers to enhance selectivity and on-column high-salt stacking to improve sensitivity

A Simple and Quick Method for the Determination of Pesticides in Environmental Water by HF-LPME-GC/MS

Contact Info

Product

Resources

About