Results 41 to 50 of about 11,031 (219)

Comparative Gas Chromatography of Halides Using Different Substituted Phenylboronic Acids as Derivatizing Reagents [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 1992
The GC of halides (chloride, bromide and iodide) using phenylboronic acid (PBA), 4-bromophenylboronic acid (BPBA), 3, 5 bis (trifluoromethyl) phenylboronic acid (FPBA) and 2,4- dichlorophenylboronic acid (CPBA) as derivatizing reagents are compared.
Ali Sarafraz Yazdi, W.I. Stephen
doaj  

Development and validation of a GC-ECD method for pesticide residue detection in flour [PDF]

Makedonsko Farmacevtski Bilten
This study aimed to optimize and validate a rapid, reliable and accurate method for quantitative determination of pesticide residues in flour matrix.
Margarita Timofejeva, Anita Najdenkoska, Biljana Bauer   +2 more
doaj   +1 more source

A review of the application of comprehensive two-dimensional gas chromatography MS-based techniques for the analysis of persistent organic pollutants and ultra-trace level of organic pollutants in environmental samples

Reviews in Analytical Chemistry, 2022
Analysis of complex samples in environmental matrices poses extreme challenge for analytical chemists as the number of known and unknown compounds are numerous and have varying physical and chemical properties.
Vaye Oliver, Ngumbu Rafael Sarji, Xia Dan   +2 more
doaj   +1 more source

Determination of Chlorinated organic compounds in aqueous matrices [PDF]

, 2009
Thirteen pure volatile, semi-volatile and non-volatile chlorinated organic compounds of molecular weights ranging from trichloroethylene (MW = 131.39 g mole -¹) to hexachlorobenzene (MW = 284.78 g mole-¹) were determined in aqueous matrices by GC-ECD ...
Martin, TG, Mccarthy, MA, Ng, CF, Possingham, HP   +3 more
core   +2 more sources

Application of LPME/GC-ECD for determination of PCP in water [PDF]

Science in China Series B: Chemistry, 2003
Liquid-phase microextraction (LPME) followed by gas chromatography (GC) coupled with an electron capture detector (ECD) was applied for the analysis of pentachlorophenol (PCP) in aqueous samples. After alkalization with Na2CO3 solution, PCP was acetylated with acetic anhydride.
Ping Li, Junxin Liu
openaire   +1 more source

Greenhouse gas measurements from a UK network of tall towers: technical description and first results [PDF]

, 2018
A network of three tall tower measurement stations was set up in 2012 across the United Kingdom to expand measurements made at the long-term background northern hemispheric site, Mace Head, Ireland.
A. Grant, A. J. Manning, A. J. Manning, A. R. Stavert, A. R. Stavert, C. M. Harth, D. E. Oram, D. Young, K. M. Stanley, P. G. Simmonds, P. K. Salameh, R. G. Derwent, S. O'Doherty, T. G. Spain, W. T. Sturges   +14 more
core   +4 more sources

Application of a GC-ECD for measurements of biosphere–atmosphere exchange fluxes of peroxyacetyl nitrate using the relaxed eddy accumulation and gradient method [PDF]

, 2014
Peroxyacetyl nitrate (PAN) may constitute a significant fraction of reactive nitrogen in the atmosphere. Current knowledge about the biosphere–atmosphere exchange of PAN is limited, and only few studies have investigated the deposition of PAN to ...
A. Moravek, I. Trebs, T. Foken
core   +1 more source

Implementation of the methodology QuEChERS in the residual pesticide analysis in white corn (Zea mays)

Temas Agrarios, 2015
The use of pesticides on maize crops during and after harvest constitutes a serious health and environmental risk if its prevalence remains during the consumption line.
Martha I. Páez, Jina M. Martínez
doaj   +1 more source

Box Behnken design-based optimized extraction of non-dioxin-like PCBs for GC-ECD and GC-MS analyses in milk samples

Emerging Contaminants, 2020
A multivariate optimization process of the sample extraction procedure by Box-Behnken design through a global desirability function is described for the determination of six non-dioxin-like polychlorinated biphenyls (NDL-PCBs # 28, 52, 101, 153, 138 and ...
Valeria Nardelli, Valeria D’Amico, Ines Della Rovere, Francesco Casamassima, Wadir Mario Valentino Marchesiello, Donatella Nardiello, Maurizio Quinto   +6 more
doaj   +1 more source

Measurements of PAN, alkyl nitrates, ozone, and hydrocarbons during spring in interior Alaska [PDF]

, 1996
Measurements of the atmospheric mixing ratios of ozone, peroxyacetylnitrate (PAN), hydrocarbons, and alkyl nitrates were made in a boreal forest ecosystem in the interior of Alaska from March 15 to May 14, 1993.
Atlas, E, Beine, HJ, Blake, DR, Harris, J, Jaffe, DA   +4 more
core   +2 more sources