Determination of Pesticides in Indoor Air and Dust

1993 ◽  
Vol 76 (5) ◽  
pp. 1121-1126 ◽  
Author(s):  
Kurt S Roinestad ◽  
Judith B Louis ◽  
Joseph D Rosen
Keyword(s):  
Indoor Air ◽  
Pesticide Exposure ◽  
Ion Trap ◽  
Gas Chromatography Mass Spectrometry ◽  
Simple Method ◽  
Limits Of Detection ◽  
Ion Trap Mass Spectrometer ◽  
Household Chemicals ◽  
Multiresidue Determination

Abstract Improved analytical and sampling methods were developed for the multiresidue determination of pesticides in indoor air. Air analysis consists of adsorption of the pesticides in 1 m3 of air onto Tenax TA via an air sampling pump, desorption with acetone, and determination and quantitation by gas chromatography/mass spectrometry (GC/MS) with chemical ionization on an ion trap mass spectrometer. Limits of detection for the 23 pesticides studied ranged from 0.5 ng/m3 for chlorpyrifos and diazinon to 30 ng/m3 for o-phenylphenol (approximately 0.5-30 parts per trillion on a w/w basis). A simple method for the detection of pesticides in dust was also developed. This method involves emptying the contents of a vacuum cleaner bag into a standard household food processor and extracting 1 g homogenized dust with acetone before GC/MS. Limits of detection were 25-100 ppb because of interferences by common household chemicals. However, pesticide concentrations were higher in dust than in air, therefore, analysis of dust is a better indicator of indoor pesticide exposure.

Determination of δ-hexadecansultone in sodium α-olefinesulphonates and liquid detergents using gas chromatography-mass spectrometry (GC/MS)

2019 ◽  
Vol 85 (7) ◽  
pp. 16-21
Author(s):  
Liliya R. Mubarakova ◽  
German K. Budnikov
Keyword(s):  
Multicomponent Mixture ◽  
Operating Mode ◽  
Complete Separation ◽  
Gas Chromatography Mass Spectrometry ◽  
Liquid Detergent ◽  
Cyclic Esters ◽  
Alcohol Water ◽  
Household Chemicals ◽  
Hydrolysis Of

Sultones are cyclic esters of hydroxysulfonic acids, which are formed in the process of sulfonation of α-olefins with sulfur trioxide gas. More stable sultones may be present in the final product — an anionic surfactant — sodium α-olefin sulfonate (AOC-Na). AOC-Na is widely used in the production of household chemicals and cosmetic products, including liquid dishwashing detergents. Sultones are strong skin sensitizers, their level in AOC-Na should be strictly controlled and not exceed 5 ppm. Operational and strict control of the sultone content upon AOC-Na production allows timely adjustment at the stage of hydrolysis, which leads to a more complete disclosure of the sultone cycle with the formation of the corresponding olefin sulfonates and hydroxyalkanesulfonates. We propose a method for determining δ-hexadecansultone in liquid dishwashing detergents and sodium α-olefinsulfonates obtained on the basis of α-olefins of C14 – C16 fractions using GC/MS, which provides shortening of sample preparation and keeps the sensitivity with a detection limit of 0.02 mg/kg. The effect of various weakly polar and non-polar organic solvents used for Sultone extraction from AOC-Na and liquid detergent on liquid extraction based on the dispersion of the extractant in an alcohol/water phase is studied. When selecting the solvent we have shown that the use of diethyl ether provided the best extraction of the analyte. Determination of the analyte extraction recovery was performed using the reaction of hydrolysis of the extracted mixture. We specified the operating mode of the device which provided complete separation of the components of the analyzed compounds including the samples of liquid detergent for dishes being a multicomponent mixture of complex composition.

Trace determination of acaricides in honey samples using XAD-2 adsorbent and gas chromatography coupled with an ion trap mass spectrometer detector

RSC Advances ◽  
2014 ◽  
Vol 4 (80) ◽  
pp. 42424-42431 ◽  
Author(s):  
Ivan Notardonato ◽  
Pasquale Avino ◽  
Giuseppe Cinelli ◽  
Mario Vincenzo Russo
Keyword(s):  
Gas Chromatography ◽  
Mass Spectrometer ◽  
Ion Trap ◽  
Trace Determination ◽  
Ion Trap Mass Spectrometer

Determination of Carbadox-Related Residues in Swine Liver by Gas Chromatography/Mass Spectrometry with Ion Trap Detection

1991 ◽  
Vol 74 (4) ◽  
pp. 611-618 ◽  
Author(s):  
Martin J Lynch ◽  
Franklyn R Mosher ◽  
Richard P Schneider ◽  
Hassan G Fouda ◽  
James E Risk
Keyword(s):  
Chemical Ionization ◽  
Ion Trap ◽  
Internal Standard ◽  
Gas Chromatography Mass Spectrometry ◽  
Isotope Dilution Analysis ◽  
Gas Chromatograph ◽  
Porcine Liver ◽  
Methyl Ester Derivative ◽  
Swine Liver

Abstract The Ion trap detector (ITD), in combination with a capillary gas chromatograph and under chemical ionization conditions, offers sufficient sensitivity to determine carbadoxrelated residues as the methyl ester derivative of quinoxaline- 2-carboxylic acid at 3 μg/kg or higher in porcine liver. A tetradeuterated internal standard of QME effectively compensates for losses incurred during sample preparation. The method produced mean levels of 3.3 (±0.5), 5.5 (±0.8), and 10.1 (±0.9) μg/kg for liver fortified at 3, 5, and 10 μg/kg. When applied to analysis of samples containing incurred residues of 14C-carbadox at the low μg/kg level, results were comparable to those obtained by reverse isotope dilution analysis.

scholarly journals Determination of the Phenolic Profile and Antioxidant Activity of Leaves and Fruits of SpanishQuercus coccifera

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
L. Molina-García ◽  
R. Martínez-Expósito ◽  
M. L. Fernández-de Córdova ◽  
E. J. Llorent-Martínez
Keyword(s):  
Antioxidant Activity ◽  
High Performance ◽  
Ion Trap ◽  
Food Samples ◽  
Total Phenolic ◽  
Phenolic Profile ◽  
Ion Trap Mass Spectrometer ◽  
High Antioxidant Activity ◽  
Cardioprotective Effects

In this work, we report the phytochemical composition and antioxidant activity of methanol extracts of leaves and fruits (acorns) ofQuercus coccifera(kermes oak). Forty-one compounds were characterized using high-performance liquid chromatography with electrospray multistage mass spectrometry (HPLC-ESI-MSn) with an ion trap mass spectrometer. A high percentage of the detected compounds were gallic acid derivatives, although some saccharides and flavonoids were also present. This phytochemical pattern is typical inQuercusspecies, which are rich in gallotannins. These compounds are partially responsible for the cardioprotective effects observed in different food samples containing them. We evaluated the antioxidant activity by ABTS and DPPH assays. In both cases, high antioxidant activity was observed, being higher in acorns than in leaves. The high antioxidant potential of the extracts, which is related to the high total phenolic content, indicates the potential benefit of the use of this species as a source of bioactive compounds.

scholarly journals Spectrofluorimetric Determination of Formaldehyde in Maple Syrup

2002 ◽  
Vol 85 (5) ◽  
pp. 1144-1147 ◽  
Author(s):  
Luc Lagace ◽  
Johanne Dumont ◽  
Germain Brazeau ◽  
Andree Soucy ◽  
Jonathan Haché ◽  
...  
Keyword(s):  
Standard Method ◽  
Simple Method ◽  
Limits Of Detection ◽  
Maple Syrup ◽  
Spectrofluorimetric Determination

Abstract A quick and simple method was developed for determination of formaldehyde in maple syrup. In this method, formaldehyde reacts with Fluoral P to form a complex which is chemically extracted by isobutanol and determined by spectrofluorimetry. Performance, as gauged by the limits of detection (0.16 mg/kg) and quantitation (0.21 mg/kg), recovery (>79%), and variability (1.9–16.1%, depending on fortification level and class of syrup) were superior to the current official AOAC standard method.

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