Perì tû bdelygmatos tês eremóseos [kreikkaa]

Invocatio: A. O. [kreikkaa].

Determinación simultánea de Cr, Ni y V en orina mediante et aas

A procedure for the simultaneous determination of Cr, Ni, and V in urine by electrothermal atomic absorption spectrometry (ET AAS) was optimized by factorial design, and performed at a pyrolysis and atomization temperatures of 1300 and 2500 ºC, respectively, using 15 µg de Mg(NO3)2 as chemical modifier. Characteristics mass of 14, 6 and 220 ρg and detection limits of the method of 0.07, 0.38 and 0.75 µg L-1 were obtained for Cr, Ni and V respectively. The methodology was validated using a Liphochek Urine Metals Control sample (Bio-Rad) (P=0.05). The methodology was applied to samples of voluntary Venezuelan people, not environmentally exposed to specific emissions, and results ranging from < LOD-1.1 and 1.3-3.3 µg L-1 was observed for Cr and V, respectively, and not detectable levels for Ni.

Hrus̆ts̆ovin kylmä rauha

Kirjallisuusarvostelu

Sodium dodecyl sulfate coated γ-alumina support modified by a new Schiff base for solid phase extraction and flame-AAS determination of lead and copper ions

A simple and fast approach for solid phase extraction is herein described, and used to determine trace amounts of Pb2+ and Cu2+ metal ions. The solid phase support is sodium dodecyl sulfate (SDS)-coated γ-alumina modified with bis(2-hydroxy acetophenone)-1,6-hexanediimine (BHAH) ligand. The adsorbed ions were stripped from the solid phase by 6 mL of 4 M nitric acid as eluent. The eluting solution was analyzed by flame atomic absorption spectrometry (FAAS). The sorption recovery of metal ions was investigated with regard to the effects of pH, amount of ligand, γ-alumina and surfactant and the amount and type of eluent. Complexation of BHAH with Pb2+ or Cu2+ ions was examined via spectrophotometry using the HypSpec program. The detection limit for Cu2+ was 7.9 µg L-1 with a relative standard deviation of 1.67%, while that for Pb2+ was 6.4 µg L-1 with a relative standard deviation of 1.64%. A preconcentration factor of 100 was achieved for these ions. The method was successfully applied to determine analyte concentrations in samples of liver, parsley, cabbage, and water.

DETERMINAÇÃO DE Cd E Pb EM AMOSTRAS DE GOMA XANTANA POR GF AAS

This paper describes the evaluation of a method for determination of Cd and Pb in xanthan gum samples by Graphite Furnace Atomic Absorption Spectrometry (GF AAS) using NH4H2PO4 as the chemical modifier. The sample preparation was performed using a reflux system adapted in the digestion tubes. With this system it was possible to increase the temperature of the digester block above the boiling point of the reaction medium, preventing loss of analyte and excessive evaporation of acids during heating. Samples were digested with HNO3 for 3 h in a digester block at 220 ºC. The limits of detection for Cd and Pb were 2.2 and 33.8 ng g-1, respectively. The RSDs for both analytes were, on average, lower than 5.0% and accuracy was verified by recovery tests, yielding values in the 83-100% range.

Sukupuoli, ts. kuva

Kirjallisuusarvostelu

Tango, twist ja Tšaikovski : musiikki Aki Kaurismäen elokuvassa Tulitikkutehtaan tyttö

Musiikkiraita ; "Tunnusmusiikki" ; Tulkinnallisia kysymyksiä ; "Draamantynkä" ja avoimet tekstit.

Anvisningar rörande ifyllandet av inköpskvitton, FF-blankett E 36

13 x 20 cm

FF-blankett E 87 (Överlåtelseskyldighet för kött)

21 x 35 cm

Användningen av Ff-blanketterna N:r J 7 och J 7 c, beviljande av inköpstillstånd för anskaffning av förnödenheter, på vilka grundlagersystemet tillämpas, samt kvittering av inköpstillstånd

17 x 25 cm

Vue de la montaigne de Brocken située dans le territoire du Comté de Wernigerode, qui est dans les forêts de Hartz : perspectivische Vorstellung des berühmten Blocken oder Blokenbergs ...

Nimeketiedot nimiönkehyksissä

Carte de la Russie d'Europe avec indication des dépôts et établissements de la "Société anonyme d'exploration du naphte, Nobel Frères"

Kartta kuuluu A. E. Nordenskiöldin kokoelmaan