Results 31 to 40 of about 265,312 (219)
Pesticide residues in vegetables in four regions of Jilin Province
International Journal of Food Properties, 2020 A study of pesticide residues was investigated in vegetable samples to highlight the trend of drugs obtained from the Jilin Province, China. Total of 230 samples obtained from four regions over the period 2016–2017 were screened for 18 pesticides that ...
Di Hu +6 more
doaj +1 more source
Improving measurements of SF6 for the study of atmospheric transport and emissions [PDF]
Atmospheric Measurement Techniques, 2011 Sulfur hexafluoride (SF6) is a potent greenhouse gas and useful atmospheric tracer. Measurements of SF6 on global and regional scales are necessary to estimate emissions and to verify or examine the performance of atmospheric transport models.
D. F. Hurst +8 more
doaj +1 more source
Journal of Forensic Science and Medicine, 2019 In this study, a sensitive and rapid magnetic solid-phase microextraction (MSPE) procedure based on Fe3O4 nanoparticle-modified, multi-walled carbon nanotubes combined with a gas chromatography/electron capture detector (GC/ECD) was developed to quantify
Cui Yanhua +5 more
doaj +1 more source
Tạp chí Khoa học Đại học Đà Lạt, 2013 A method for the determination of organochlorine pesticides in the water samples by gas chromatography is described. The method consists of sorption of pesticides in water by Mn02 sorbent with a water: Chloroform (10:1, V/V) mixture.
Lê Ngọc Chung +1 more
doaj +1 more source
Atmosphere, 2022 The aim of this study was to develop and optimize methods for the determination of gaseous and particulate (PM2.5) secondary amines (SAs) in the atmosphere using gas chromatography coupled with electron capture detection (GC-ECD) following chemical ...
Thu Thi Hoai Mai, Hekap Kim
doaj +1 more source
Angewandte Chemie, EarlyView.Epimer discrimination remains challenging due to subtle NMR differences. Here, we propose a methodology based on 13C‐RCSA and RDC anisotropic parameters, enabling the assignment of two flexible tetraprenyltoluquinol epimers (1a and 1b) with remote stereoclusters.
Juan Carlos C. Fuentes‐Monteverde +6 more
wiley +2 more sources
, 2008 We present and compare results obtained from the analysis of polychlorinated bipheryls (PCBs) of a limited number of contaminated soil samples collected in three areas of Basilicata region (south of Italy The levels of PCBs were evaluated by using two ...
PALMA A +5 more
core +2 more sources
Fast and Easy Method of 55 Pesticide Residues Determination in Commonly Fruits and Vegetables Collected from Egyptian Local Markets [PDF]
Journal of Plant Protection and Pathology, 2019 The highest concerns of consumers who need food safety are pesticide residues in fruits and vegetables. In this study, a total fifty-five pesticide residues from different chemical groups including insecticides, fungicides, herbicides, acaricides and ...
Dalia Elhefny, A. A. EL-Ghanam, S. Hamed
doaj +1 more source
Use and Reuse of SPE Disks for the Determination of Pyrethroids in Water by GC-ECD [PDF]
Analytical Letters, 2009 Abstract Seven pyrethroids (bifenthrin, fenpropathrin, λ-cyhalothrin, permethrin, α-cypermethrin, fenvalerate, and deltamethrin) were extracted from water using C18 solid-phase extraction disks, followed by gas chromatography with an electron capture detector (GC-ECD) analysis.
Domingues, Valentina F. +3 more
openaire +2 more sources
Química Nova, 2014 The objective of this study was to optimize and validate a solid-liquid extraction method with low-temperature partitioning (SLE/LTP) for the analysis of pesticides.
Romenique da Silva de Freitas +4 more
doaj +1 more source