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TRACE DETECTION [9 records]

Record 1 2019-05-31

English

Subject field(s)
  • Food Safety
  • Collaboration with the FAO
  • Scientific Research Methods
CONT

Anodic stripping voltammetry is a method to demonstrate the presence of multiple metals in water. This method is usually applied to investigate the water quality of surface or drinking water or sewage.

CONT

Anodic stripping voltammetry(ASV) is the most common of a class of techniques known as stripping electroanalytical methods(SEAM). The defining characteristic of these methods is the preconcentration of analyte at the electrode surface in order to lower the detection limit for that analyte.... Usually a mercury drop or mercury thin-film electrode is employed under forced convective conditions(stirred solution). The preconcentration step is followed by a short time period in which the solution is allowed to quiet(no stirring), following which a potential scan is initiated from the deposition potential in the anodic direction. ASV is well-suited for the determination of trace amounts of many metal contaminants. “Stripping” refers to the characteristic sharp voltammetric waves that occur for metals as they are oxidized out of mercury, in which many metals form amalgams.

French

Domaine(s)
  • Salubrité alimentaire
  • Collaboration avec la FAO
  • Méthodes de recherche scientifique

Spanish

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Record 2 2013-10-09

English

Subject field(s)
  • Air Safety
  • Explosives and Pyrotechnical Materials (Industries)
CONT

The US [United States] Transportation Security Administration(TSA) has increased the use of explosive trace detection(ETD) technology at airports across the nation to enhance existing levels of security.

French

Domaine(s)
  • Sécurité (Transport aérien)
  • Explosifs et artifices (Industries)

Spanish

Save record 2

Record 3 2013-09-26

English

Subject field(s)
  • Security Devices
  • Air Safety
  • Surveillance and Formalities (Air Transport)
DEF

A manually operated equipment used to detect minute traces of explosive residue on the outside of carry-on baggage and checked baggage.

French

Domaine(s)
  • Dispositifs de sécurité
  • Sécurité (Transport aérien)
  • Contrôles et formalités (Transport aérien)
DEF

Équipement à fonctionnement manuel qui sert à détecter des traces minuscules de résidus d’explosifs sur les bagages à main et les bagages enregistrés.

Spanish

Save record 3

Record 4 2013-09-11

English

Subject field(s)
  • Air Safety
  • Explosives and Pyrotechnical Materials (Industries)
OBS

ETD [explosive trace detection] is used on a random basis; therefore, it is possible that screening officers may swab your carry-on baggage or your hands and then use ETD technology to test for explosives.

French

Domaine(s)
  • Sécurité (Transport aérien)
  • Explosifs et artifices (Industries)
OBS

La DTE [détection de traces d’explosifs] est utilisée de façon aléatoire; par conséquent, il est possible que les agents de contrôle effectuent un prélèvement sur vos bagages de cabine ou vos mains, et qu'ils utilisent ensuite la technologie de DTE pour vérifier la présence d'explosifs.

Spanish

Save record 4

Record 5 2013-02-08

English

Subject field(s)
  • Security
  • CBRNE Weapons

French

Domaine(s)
  • Sécurité
  • Armes CBRNE

Spanish

Save record 5

Record 6 2003-05-29

English

Subject field(s)
  • Chemistry
CONT

Photon excitation : X-ray emission induced by the impact of charged particles other than electrons, for example alpha particles, was discovered by Chadwick in 1912. High energy(1. 5 MeV) photons are associated with large cross-sections for ionization and very low backgrounds, two ideal conditions for very low detection limits that effectively reach 10[ upperscript-11]-10[ upperscript-12](g) for elements with Z > 15. On account of this high absolute sensitivity, photon excitation is used with Si(Li) detectors in many applications dealing with the simultaneous determination of trace elements in water, serum, blood and tissues.

French

Domaine(s)
  • Chimie
CONT

Fluorescence : Luminescence produite à partir d'un état singulet, très bref, excité électroniquement. Cette luminescence se produit après disparition de la source d'excitation (excitation photonique, souvent UV).

CONT

La thérapeutique photo-dynamique dans le cancer bronchique précoce. [...] Sous l'action d'une lumière adaptée à la molécule, ce photo-sensibilisateur devient actif et toxique. L'excitation photonique permet de transférer l'énergie vers l'oxygène ambiant qui prend alors la forme d'oxygène singulé. Cet oxygène est extrêmement réactif et toxique et oxyde tous les constituants tissulaires situés à son contact.

Spanish

Save record 6

Record 7 2003-01-06

English

Subject field(s)
  • Scientific Instruments
  • Scientific Measurements and Analyses
  • Astrophysics and Cosmography
CONT

The primary instrument is a heterodyne receiver, the Submillimeter Limb Sounder(SLS), whose extremely high abundance sensitivity and high spectral resolution allows the detection of trace gases while simultaneously measuring wind velocities for key constituents above the clouds.

French

Domaine(s)
  • Instruments scientifiques
  • Mesures et analyse (Sciences)
  • Astrophysique et cosmographie

Spanish

Save record 7

Record 8 1996-05-13

English

Subject field(s)
  • Analytical Chemistry
CONT

The amperometric detector is useful for detecting electroactive substances and has found considerable use in biological applications, for example, in the HPLC separation and detection of trace quantities of catecholamines from the brain.

French

Domaine(s)
  • Chimie analytique
CONT

[...] les détecteurs ampérométriques [...] n'effectuent qu'une électrolyse partielle du soluté. Les détecteurs ampérométriques sont, d'une façon générale, équipés d'une cellule de très faible volume mort [...] et des limites de détectabilité voisines de 10minus 10 g de substance injectée sont couramment atteintes pour de nombreux composés organiques.

Spanish

Save record 8

Record 9 1989-11-15

English

Subject field(s)
  • Scientific Instruments
  • Physics of Solids
CONT

Mass spectrometry. The analysis of solid inorganic samples can be made... by vaporization in a Knudsen cell arrangement at very high temperature.... Detection... is by photographic plate; exposures for different lengths of time are recorded sequentially, and the darkening of the lines on the plate is related empirically to quantitative composition by calibration charts. The method is useful for trace analysis....

French

Domaine(s)
  • Instruments scientifiques
  • Physique des solides
OBS

Une cellule de Knudsen est une petite enceinte munie d'un orifice de surface au moins 100 fois plus petit que la surface intérieure de l'enceinte et de diamètre au moins 10 fois inférieur au libre parcours moyen des molécules de gaz contenues.

Spanish

Save record 9

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