Determination of aldicarb, aldicarb oxime, and aldicarb nitrile in water by gas chromatography/mass spectrometry

Trehy, Michael L.; Yost, Richard A.; McCreary, John J.

doi:10.1021/ac00272a020

Cited by 51 publications

(22 citation statements)

References 22 publications

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“…Aldicarb has the structure of an oxime carbamate and the major product of its thermal degradation is the corresponding nitrile [5].…”

Section: Carbamate Reactivity In Gcmentioning

confidence: 99%

“…Several special devices have been designed to minimise the decomposition of thermally labile compounds in GC (short columns [4,5]; programmed temperature vaporizer devices [4,6]; low pressure GC [7], and supersonic GC [8]). Several reports have studied the photodegradation of such pesticides [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, few studies have addressed the thermal degradation of carbamate pesticides. Trehy et al [5] have shown that aldicarb decomposes to its corresponding nitrile both thermally and in the presence of anaerobic microorganism, while Santos et al [11] studied the thermal decomposition of carbamates in GC as a function of several variables, such as concentration, needle length, and injector temperature.…”

Section: Introductionmentioning

confidence: 99%

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Behaviour of carbamate pesticides in gas chromatography and their determination with solid‐phase extraction and solid‐phase microextraction as preconcentration steps

Carabias‐Martínez¹,

García-Hermida

Rodríguez‐Gonzalo

et al. 2005

J of Separation Science

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This work reports a study of the chromatographic behaviour of seven carbamate pesticides (aldicarb, carbetamide, propoxur, carbofuran, carbaryl, methiocarb, and pirimicarb) by gas chromatography-mass spectrometry (GC-MS). Variables such as injector temperature, solvent, injection mode, and the degree of ageing of the chromatographic column were studied. One of the aims of this work was to achieve a controlled decomposition of carbamates by a solid-phase microextraction (SPME) preconcentration step with a polyacrylate fibre in order to obtain reproducible chromatographic signals of the degradation products. Optimisation of the SPME process was accomplished by means of experimental design. Several methods using ultrapure water were developed with different preconcentration configurations: SPME-GC-MS, SPE followed by SPME-GC-MS, and SPE plus GC-MS. For all the pesticides studied, method detection limit (MDL) values below 0.1 microg L-1 were reached in at least one of the proposed configurations.

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“…Aldicarb has the structure of an oxime carbamate and the major product of its thermal degradation is the corresponding nitrile [5].…”

Section: Carbamate Reactivity In Gcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Behaviour of carbamate pesticides in gas chromatography and their determination with solid‐phase extraction and solid‐phase microextraction as preconcentration steps

Carabias‐Martínez¹,

García-Hermida

Rodríguez‐Gonzalo

et al. 2005

J of Separation Science

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“…In the upper portion (a), the sample is introduced either through a Varian (Walnut Creek, CAl 3400 GC (4) or through our homemade GC injector (3) and is transferred through a 50-cm-Iong megabore capillary column (5) to the supersonic nozzle (6). The nozzle flow is supplied by both needle values V 1 and V 2 • The supersonic beam (homemade) nozzle is an all ceramic or Vespel " nozzle which was heated separately.…”

Section: A Ms 108mbmentioning

confidence: 99%

“…All these pesticides are incompatible with standard GC-MS analysis [13,14] and thus they require fast GC-MS [2,3], particle beam LC-MS [13][14][15], electrospray LC-MS [25], or thermospray LC-MS [26] methods for analysis . It is clearly observed that with very fast GC-MS (Figure 3a) with a speed enhancement factor of 100, all these compounds were successfully analyzed and a reasonable GC separation was obtained.…”

Section: Fast Gc-ms Analysis Of Carbamate Pesticidesmentioning

confidence: 99%

Fast, very fast, and ultra-fast gas chromatography-mass spectrometry of thermally labile steroids, carbamates, and drugs in supersonic molecular beams

DAGAN¹,

AMIRAV²

1996

Journal of the American Society for Mass Spectrometry

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Aviv 69978, Tel Aviv, Israel Gas chromatography-mass spectrometry (GC-MS) analyses of thermally labile compounds have been studied by using a short column fast gas chromatograph, coupled with fly-through electron ionization in supersonic molecular beams. Thirty-two compounds, which include steroids, carbamate pesticides, antibiotic drugs, and other pharmaceutical compounds, have been analyzed and the details of their GC-MS analysis are provided. The ability to analyze thermally labile compounds is discussed in relation to the speed of analysis. A new term, "speed enhancement factor" (SEF), is defined as the product of column length reduction and the carrier gas linear velocity increase, as compared with normal GC-MS conditions. Fast, very fast, and ultra-fast GC-MS are defined with a SEF in the ranges of 5-30,30-400, and 400-4000, respectively. Trade-offs in the degree of dissociation, speed, gas chromatograph resolution, and sensitivity were studied and examined with thermally labile molecules . The experimental factors that affect the dissociation are described with emphasis on its reduction. We claim that the use of supersonic molecular beams for sampling and ionization provides the ultimate capability in the GC-MS of thermally labile compounds. The obtained 70-eV electron ionization mass spectra are shown, and an enhanced relative abundance of the molecular ion is demonstrated together with library search capability of these mass spectra, which is better than that reported with particle beam liquid chromatography-mass spectrometry. The performance of fast GC-MS in supersonic molecular beams is compared with other methods of fast GC-MS and with particle beam liquid chromatography-mass spectrometry. (J Am Soc Mass Spectrom 1996, 7, 737-752) G as chromatography-mass spectrometry (GC-MS) is the central technique employed today for the analysis of organic compounds, which includes analysis at trace levels in complex mixtures. However, GC-MS is limited in its scope and therefore is often replaced by liquid chromatography-mass spectrometry (LC-MS), although LC-MS analysis is more complicated to operate, exhibits poorer performance, and costs more .The scope of conventional GC-MS is limited owing to two main reasons:1. Relatively nonvolatile molecules (such as large polycyclic aromatic hydrocarbons) are incompatible with gas chromatography and especially incompatible with the mass spectrometer ion source. The ion source-limited temperature results in an early onset of chromatographic peak tailing.Address reprint requests to Professor Aviv Am irav, School of Chemistry, Sadder Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel.

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High-speed GC-MS

Leclercq

Cramers

1998

Mass Spectrom. Rev.

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Determination of aldicarb, aldicarb oxime, and aldicarb nitrile in water by gas chromatography/mass spectrometry

Cited by 51 publications

References 22 publications

Behaviour of carbamate pesticides in gas chromatography and their determination with solid‐phase extraction and solid‐phase microextraction as preconcentration steps

Behaviour of carbamate pesticides in gas chromatography and their determination with solid‐phase extraction and solid‐phase microextraction as preconcentration steps

Fast, very fast, and ultra-fast gas chromatography-mass spectrometry of thermally labile steroids, carbamates, and drugs in supersonic molecular beams

High-speed GC-MS

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