This paper describes an enhanced liquid chromatography−mass spectrometry (LC−MS) strategy for the analysis of a selected group 56 organic pollutants in wastewater. comprises 38 pharmaceuticals and 10 their most frequent metabolites, 6 pesticides, 2 disinfectants. The LC−MS methodology applied is based use hybrid triple-quadrupole linear ion trap mass spectrometer (QTRAP) combination with time-of-flight (TOF-MS). join application both techniques provided very good results terms accurate...

Detection of explosives is important for public safety. A recently developed low-temperature plasma (LTP) probe desorption and ionization samples in the ambient environment (Anal. Chem. 2008, 80, 9097) applied a comprehensive evaluation analytical performance rapid detection 13 explosives-related compounds. The selected chemicals [pentaerythritol tetranitrate (PETN), trinitrotoluene (TNT), cyclo-1,3,5-trimethylenetrinitramine (RDX), tetryl, cyclo-1,3,5,7-tetramethylenetetranitrate (HMX),...

Because of the international trade fruits and vegetables lack harmonized regulations on use pesticides worldwide, development comprehensive screening methods for analyzing hundreds other banned chemicals is very convenient. This work reports evaluation a rapid automated method determining pesticide residues in food using liquid chromatography electrospray time-of-flight mass spectrometry (LC-TOFMS) based an accurate-mass database. The database created includes data not only accurate masses...

Desorption electrospray ionization (DESI) is applied to the rapid, in situ, direct qualitative and quantitative (ultra)trace analysis of agrochemicals foodstuffs. To evaluate potential DESI mass spectrometry (MS) toxic residue testing food, 16 representative multiclass agricultural chemicals (pesticides, insecticides, herbicides, fungicides) were selected (namely, ametryn, amitraz, azoxystrobin, bitertanol, buprofezin, imazalil, imazalil metabolite, isofenphos-methyl, malathion, nitenpyram,...

The identification of transformation products pesticides in foodstuffs is a crucial task difficult to tackle, due the lack standards and scarce information available. In this work, we describe methodology for structural elucidation pesticide food. proposed strategy based on use liquid chromatography electrospray time-of-flight mass spectrometry (LC/TOFMS): accurate measurements (molecule fragment) ions interest are used order establish relationships between fragmentation parent instrument...

Low temperature plasma (LTP) ionization is an ambient method that permits the direct mass analysis of samples in their native atmospheric environment with little or no sample preparation. In this work, low probe used and rapid spectrometric aqueous phase including biofluids (saliva, urine, hair extract). A detailed trace qualitative examination 14 drugs abuse has been performed. The relative standard deviation on average was ∼16% for LTP standards. Eleven fourteen were detected ng mL−1 (3 pg...

Liquid chromatography tandem mass spectrometry (LC−MS/MS) and liquid time-of-flight (LC−TOFMS) are powerful complementary techniques that can independently cover the majority of challenges related with pesticide residue food control. The sequential combination both systems benefits from their advantages assists to increase performance simplify routine large scale multiresidue methods. proposed approach consists three stages: (1) automated screening by LC−TOFMS; (2) identification LC−TOFMS...

Here we report the first worldwide reconnaissance study of presence and occurrence pesticides in fruit-based soft drinks. While there are strict regulations exhaustive controls for fruits, vegetables, drinking water, scarce attention has been paid to highly consumed derivate products, which may contain these commodities as ingredients. In case drinks industry, no clear regulations, relating pesticides, address them, even when is significant consumption vulnerable groups such children. this...

Low-temperature plasma (LTP) permits direct ambient ionization and mass analysis of samples in their native environment with minimal or no prior preparation. LTP utilizes dielectric barrier discharges (DBDs) to create a low power which is guided by gas flow onto the sample from analytes are desorbed ionized. In this study, potential LTP-MS for detection pesticide residues food demonstrated. Thirteen multi-class agricultural chemicals were studied (ametryn, amitraz, atrazine, buprofezin,...

Abstract In‐source collision‐induced dissociation (CID) fragmentation features of multiclass flavonoid glycoconjugates were examined using liquid chromatography electrospray time‐of‐flight mass spectrometry. Systematic experiments performed to search for optimal conditions in‐source in both positive and negative ion modes. The objective the study was attain uniformly appropriate a wide range analytes independently aglycone, attached sugar part type bond between aglycone glycan moieties (O‐...

The identification of transformation products (TPs) pharmaceuticals in the environment is essentially a challenging task due to lack standards and instrumental capabilities required detect compounds (sometimes unknowns) that are produced under environmental conditions. In this work, we report use liquid chromatography/electrospray quadrupole time-of-flight mass spectrometry (LC/QTOF-MS/MS) as tool for amoxicillin (AMX) its main TPs wastewater river water samples. Laboratory degradation...