Search results for "Mercure"
showing 7 items of 17 documents
Determination of organic and inorganic mercury species in water and sediment samples by HPLC on-line coupled with ICP-MS.
2009
This paper describes a preconcentration method for Hg(2+) and MeHg(+) in water samples using sodium diethyldithiocarbamate immobilized in polyurethane foam (PU-NaDDC) and an extraction method for several mercury species in sediment samples, including MeHg(+), EtHg(+) and PhHg(+), which is simple, rapid, and uses a single organic solvent. Separation and measurement were done by high-performance liquid chromatography on-line with inductively coupled plasma mass spectrometry (HPLC/ICP-MS). Initially, the test of recovery was applied using procedures compatible with HPLC. Under the optimum extraction conditions, recoveries of 96.7, 96.3 and 97.3% were obtained for MeHg(+), EtHg(+), and PhHg(+),…
Determination of mercury by cold‐vapour technique in several tissues of treated American red crayfish (Procambarus clarkii)
1988
Abstract Adult intermolt specimens of American red crayfish (Procambarus clarkii) collected from Lake Albufera (Valencia, Spain), were exposed to mercury during 96 h. The Hg‐concentrations used were 50, 100, and 250 μg Hg/1 as Cl2Hg. The content of mercury in muscle, midgut gland, antennal glands and gills was investigated. Determinations of mercury were made by cold‐vapour technique and AAS. The mercury levels in all examinated tissues increased significantly (ANOVA test, p < 0.01) with increasing Hg‐concentration in the water.
Production of methyl mercury in the gut of the Australian termite Mastotermes darwiniensis
2008
Animals are often exposed to or can ingest heavy metals along with their food. Therefore, we tested whether the hindgut microbiota of Mastotermes darwiniensis possesses the capability to form methyl mercury. The termite M. darwiniensis (Isoptera) was fed with saw dust containing different concentrations of inorganic mercury. Methyl mercury was determined by purge-and-trap capillary gas chromatography-atom fluorescence spectrometry (CGC-AFS) using ethyl mercury chloride as the internal standard. Total mercury concentrations were determined in the termite tissue by inductive coupled plasma-isotope dilution mass spectrometry (ICP-IDMS) after microwave-assisted digestion. The obtained results s…
Darba organizācijas problēmas un to pilnveide viesnīcā Mercure Riga Centre.
2017
Ilze Bradovska izstrādājusi bakalauru “Darba organizācijas problēmas un to pilnveidošana viesnīcā Mercure Riga Centre”. Šajā darbā tika pētīta darba organizācijas problēmu ietekme uz viesnīcas iekšējiem darba procesiem, kā rezultātā strauji krītas viesnīcas pakalpojumu kvalitāte. Ar darba palīdzību tiek identificētas galvenās darba organizācijas nepilnības, kā arī tiek meklēti, pētīti un piedāvāti problēmu risinājumi. Darbā gaitā tiek gūta reāla informācija gan no viesnīcas vadības aspektiem, gan no viesu aspektiem, kur slēpjas iekšējās problēmas un, kā tās pilnveidot. Darba mērķis ir, balstoties uz pārbaudītu vadīšanas teoriju principiem, definēt darba organizācijas problēmas viesnīcā Merc…
Les bronzes figurés antiques du Musée de Mâcon (Saône-et-Loire, F)
2011
In the course of its history, the Musee des Ursulines, at Macon, collected about 10 bronze figurines, some of them found as early as the mid-17th c. This article describes this largely unpublished collection and its scientific implications. Among the new data appears a votive bronze statuette, of italic type, found locally and datable to the Vth-IVth c. BC.
LIONEL JOHNSON, L’UNIQUE
2023
Ce post examine l'unique traduction d'un poème de Lionel Johnson (1872-1902) dans la "Décabase" qui dépouille 10 revues littéraires entre 1885-1914. Johnson est fort peu connu en France et cette méconnaissance pourrait s'expliquer par sa place discrète dans les périodiques fin de siècle français. D'autres dépouillements pourraient éclairer cette réception quasi-inexistante.
How Humic Substances Dominate Mercury Geochemistry in Contaminated Floodplain Soils and Sediments
1998
The interaction of mercury (Hg) and humic substances (hs) was studied in floodplain topsoils and surface sediments of the contaminated German river Elbe. An intimate coupling exists between the geochemical cycles of Hg and organic carbon (OC) in this ecosystem. Humic substances exert a dominant influence on several important parallel geochemical pathways of Hg, including binding, transformation, and transport processes. Significant differences exist between the Hg-hs associations in floodplains and sediments. Both humic acids (ha) and fulvic acids (fa) contribute to Hg binding in the sediments. In contrast, ultrafiltration experiments proved that Hg in the floodplain soils is almost exclusi…