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Anidride carbonica

Da Wikipedia, l'enciclopedia libera.

Il biossido di carbonio (noto anche come diossido di carbonio o anidride carbonica) è un ossido acido formato da un atomo dicarbonio legato a due atomi di ossigeno. È una sostanza fondamentale nei processi vitali delle piante e degli animali. È ritenuta uno dei principali gas serra presenti nell'atmosfera terrestre.

ossido acido è linkato a Ossiacidi !!!

Ossiacidi

Da Wikipedia, l'enciclopedia libera.

(Reindirizzamento da Ossido acido)

Gli ossiacidi, conoscuti anche come ossoacidi o acidi ossigenati, sono composti ternari formati da idrogeno, non metallo e ossigeno (è importante scrivere la formula in quest'ordine). Sono acidi e derivano dalla reazione formale di un'anidride con l'acqua.

spettrofotometro per infrarosso

BILANCIA IDROSTATICA DI MOHR-WESTPHAL

Ebulliometro tipo Malligand

Ebulliometro tipo Malligand con scala centesimale

polarimetro

Atago Polax Polarimeter

Spettrofotometro per assorbimento atomico

Atomabsorptionsspektrometer

Alan Walsh
i-5bc-15-21
Ein Atomabsorptionsspektrometer ist ein Gerät, bei welchem man Spektroskopie zur chemischen Elementanalyse benutzt. Mit einem kommerziellen Modell (Perkin-Elmer, Modell 360) wird eine unbe-kannte Lösung auf Cu und Cd analysiert. Außerdem wird der Mineralgehalt verschiedener Mineralwässer verglichen.

PERKIN ELMER LAMBDA 3 SPEC - PERKIN ELMER

Perkin Elmer Lambda 3 UV/VIS Spectrophotometer Perkin Elmer Lambda 3 UV/VIS Double Beam Spectrophotometer. Resolution 2 nm. Wavelength range 190-750 nm.Comes refurbished with a 1 year parts and labor warranty

Beckman DU ultraviolet photoelectric spectrophotometer, 1950s.

The pioneering ultraviolet-visible spectrohotometer launched by Beckman Instruments in 1941. Like many early spectrophotometers, this was a point by point instrument and could not record a continuous spectrum. Nonetheless its ruggedness, relative cheapness and ease of use ensured its popularity in the 1940s and 1950s. A spectrophotometer is an instrument for measuring the intensity of light in various parts of the spectrum, especially as transmitted or emitted by a substance or solution at a particular wavelength.


http://www.sciencemuseum.org.uk/images/I062/10327120.aspx

BECKMAN DB GT GRATING SPECTROPHOTOMETER

051 BECKMAN DB GT GRATING SPECTROPHOTOMETER (c 1967)

Including Instruction Manual 566-F (dated April 1967)

Beckman Instruments, Inc. Cat. No.: 156801

25*59*36

Metallic housing, with sample placement door at front. Front panel controls for photomultiplier offset and calibration and wavelength selection. Relative absorption read from a meter at front, or may be connected to a chart recorder. 220V, 1A, 50Hz power supply. Ports at the rear allow the circulation of coolant through sample chamber.

Light from either a tungsten lamp (visible) or a hydrogen lamp (UV) is split into two beams. A grating is used to isolate a particular wavelength for study. One beam passes through the sample being analysed and the other is a reference, and the beams are detected by a photomultiplier. A signal is then produced which indicates the relative absorption of that wavelength by the sample. The grating may be set to scan across the available wavelengths at a constant rate and the results recorded by a chart recorder (not present). A coolant circulation system was an optional feature which has been installed on the device (probably added subsequent to purchase).

The primary uses of such a spectrophotometer were biological assays, analysis of biological samples and the study of the rates of production of reaction products in the life sciences. The device on display was in use by the Biochemistry Department at The University of Queensland until 1991 and was certified as serviceable by that department 03/04/90. It appears undamaged and in fair operational order.

References:

1. Harrison Stephens, Golden Past - Golden Future, The First Fifty Years of Beckman Instruments, Inc. Claremont University Centre, 1985.

2. Edisbury, J., Practical Hints on Absorption Spectrometry, Plenum, NY, 1967.

3. Lothian, G., Absorption Spectrophotometry, Hilger, London, 1958.

4. Mellon, M., Analytical Absorption Spectroscopy, J. Wiley, London 1950.

5. Varma, A., CRC Handbook of Atomic Absorption Analysis, Vol. 1, pp.3-37.

6. http://www.beckman,com

MH

http://www.physics.uq.edu.au/physics_museum/optics.html

Using a Spectrophotometer (spectronic 20)

http://biology.clc.uc.edu/Fankhauser/Labs/Microbiology/Growth_Curve/Spectrophotometer.htm

bilancia analitica METTLER H10Tw

339 METTLER H10Tw ANALYTICAL BALANCE

Mettler, Zurich (c 1970)

24.0*50.5*41.0 cm

The unit is housed in a die cast metal case, with sliding side windows providing access to the measuring pan suspended from above. Above and behind this chamber is housed the balance mechanism. The digital readout and dials used to operate the apparatus are attached to the front console.

It is estimated that weights and balances have existed for the purposes of barter and exchange from at least 3000 BC. Based on these most ancient concepts of balance, this unit employs some twentieth century innovation in creating a convenient and accurate weight measuring device. The H10Tw was produced for laboratory applications by the Swiss balance manufacturer Mettler. This style of mechanical balance was regarded as the standard device for laboratory measurements during the 1970s and 80s.

The balance consists of a beam, one end of which supports the pan and adjustable weights and the other which supports the counterpoise weight (equal in mass to the pan plus the adjustable weights). The in-built adjustable concentric ring weights are mechanically arranged using dials on the front console. After placing the object of interest on the pan, equilibrium over a synthetic sapphire knife edge is broadly reached by removing the appropriate ring masses above the pan. The small deviation from equilibrium is then measured on an engraved optical scale placed in a reticle appended to the end of the lever. Light incident on the scale travels through a series of lenses and mirrors to be projected onto the rear of the front console. Ultimately, the balance measures to a precision of 0.05 mg over a range from zero to 160 grams. The H10Tw also features symmetrical air damping, an in-built taring facility and zero point and sensitivity adjustments.

Purchased for A$435 around 1970, the balance found routine laboratory application in The University of Queensland Pathology Department, being donated to the Physics Museum in 1996.

References:

1. T. Buckley (1985) Instrument Maintenance and Operation for Laboratory Assistants. Canberra: International Development Program of Australian Universities and Colleges Ltd.

2. J.T. Stock (1969) Development of the Chemical Balance, HMSO.

http://www.physics.uq.edu.au/physics_museum/tour/metrology.html

The modern analytical balance

http://www.humboldt.edu/scimus/BalanceExhibit/Modern_Balance.jpg
The Chemist's Balance at Humboldt

Mettler H10 Analytical Balance (1971)

http://www.humboldt.edu/scimus/BalanceExhibit/Index.html