Results 11 to 20 of about 381,051 (306)
Urinary 2,5-hexanedione in workers exposed to n-hexane: influence of the sample treatment
Química Nova, 2007 The aim of the present study was to determine 2,5-hexanedione (2,5-HD), a metabolite of n-hexane, by gas chromatography/flame ionization detection in 31 workers exposed to n-hexane after two types of sample pretreatment, i.e., with (total 2,5-HD) and ...
Daniela Magalhães Nolasco +2 more
doaj +1 more source
The fifth international radiocarbon intercomparison (VIRI): An assessment of laboratory performance in stage 3 [PDF]
, 2010 Proficiency testing is a widely used, international procedure common within the analytical chemistry community. A proficiency trial (which VIRI is) often follows a standard protocol, including analysis that is typically based on zscores, with one key ...
Cook, G., Naysmith, P., Scott, E.M.
core +2 more sources
Testing the human factor: Radiocarbon dating the first peoples of the South Pacific [PDF]
, 2010 Archaeologists have long debated the origins and mode of dispersal of the immediate predecessors of all Polynesians and many populations in Island Melanesia.
Anderson, Kathy +6 more
core +2 more sources
Shipin gongye ke-ji, 2023 Fluoroquinolones and amphenicols are widely used as broad-spectrum and high-efficiency antibiotics in livestock and poultry production, but excessive drug residues frequently occur.
Fanxun GUAN +5 more
doaj +1 more source
A novel enzymatic approach to nanocrystalline cellulose preparation [PDF]
, 2018 In this work, conditions for an enzymatic pretreatment prior to NCC isolation from cotton linter were assessed. Different cellulase doses and reaction times were studied within an experimental design and NCC were obtained. At optimal enzymatic conditions
Beltramino, Facundo +3 more
core +2 more sources
Pretreatment of Wood and Char Samples [PDF]
Radiocarbon, 1963 It has been shown that contamination from humic acids, chitin, fungal products, etc., contributing young carbon, and from bitumen and carbonate, contributing old carbon, may not be completely removed from wood and char samples by the usual hydrochloric acid and sodium hydroxide pretreatments of the samples. A procedure is offered for the isolation of a
Hyman Schultz +3 more
openaire +1 more source
The influence of hydrogen treatment and catalyst morphology on the interaction of oxygen with a silver catalyst [PDF]
, 1987 The interaction of an unsupported silver catalyst which had been pretreated by hydrogen at various temperatures with oxygen at 210°C has been studied using Temperature Programmed Reduction (TPR) over a temperature range up to 900°C. Hydrogen treatment at
Lefferts, L. +2 more
core +4 more sources
Biosensors, 2019 This report is dedicated to development of surface-enhanced Raman spectroscopy (SERS) based analysis protocol for detection of antibiotics in urine. The key step of the protocol is the pretreatment of urine before the detection to minimize background ...
Natalia E. Markina, Alexey V. Markin
doaj +1 more source
Synthesis of cross-linked chitosan functionalized with threonine moiety and its application to on-line collection/concentration and determination of Mo, V and Cu [PDF]
, 2007 A novel chitosan-based resin functionalized with threonine moiety was synthesized, and applied to the collection/concentration of Mo, V and Cu in environmental water samples, followed by their determination using inductively coupled plasma-atomic ...
Hakim, Lukman +4 more
core +1 more source
International Journal of Technology, 2019 The widespread presence of contaminants in water demands reliable and practical analytical methods to monitor them. However, before their determination, a sample pretreatment step is necessary.
Muhammad Nur' Hafiz Rozaini +3 more
doaj +1 more source