atomic-absorption-spectrometer

Atomic Absorption Spectrophotometer

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ACY

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PVT.

LTD.

Hand Held-ANS-1 Series)

OPERATING PRINCIPLE The technique makes use of absorption spectrometry to assess the concentration of an analyte in a sample. It relies therefore heavily on Beer-Lambert law.

In short, the electrons of the atoms in the atomizer can be promoted to higher orbital's for an instant by absorbing a set

ATOMIC Absorption Spectrophotometer

quantity of energy (i.e. light of a given wavelength). This amount of energy (or wavelength) is specific to a particular electron transition in a particular element, and in general, each wavelength corresponds to only one element. This gives the technique its elemental selectivity.

As the quantity of energy (the power) put into the flame is

Atomic Absorption Spectrophotometer

known, and the quantity remaining at the other side (at the

(AAS) is for determining the concentration

detector) can be measured, it is possible, from Beer-Lambert

of a particular metal(element) in a sample.

law, to calculate how many of these transitions took place, and

AAS can be used to analyze the

thus get a signal that is proportional to the concentration of the

concentration of over 62 different metals.

element being measured.

TECHNIQUES In order to analyze a sample for its atomic constituents, it has to be atomized. The sample should then be illuminated by light.

The light transmitted is finally measured by a detector. In order to reduce the effect of emission from the atomizer (e.g. the black body radiation) or the environment, a spectrometer is normally used between the atomizer and the detector.

The technique typically makes use of a flame to atomize the sample,[3] but other atomizers such as a graphite furnace[4] or plasmas, primarily inductively coupled plasmas, are also used.[5]

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ATOMIC Absorption Spectrophotometer When a flame is used it is laterally long (usually 10 cm) and not

sample can be analyzed immediately. It is the preferable

deep. The height of the flame above the burner head can be

instrument chosen by users to conduct analysis of multiple

controlled by adjusting the flow of the fuel mixture. A beam of

kinds of elements and fast analysis of samples.

light passes through this flame at its longest axis (the lateral axis) and hits a detector.

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High precision of measurement: Gas path system is

equipped with precision pressure stabilizing and current stabilizing devices to reach stable flame and low noise.

Analysis of liquids A liquid sample is normally turned into an atomic gas in three steps: 1.Desolvation - the liquid solvent is evaporated, and the dry sample remains 2.Vaporization - the solid sample vaporises to a gas 3.Atomization - the compounds making up the sample are broken into free atoms.

Specially designed fine light beam passes through the flame to ensure a high precision analytical test and low characteristic concentration.

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Optical path of high energy: A total reflection system is

adopted to eliminate color difference in full range. By means of chemical conversion, a round light spot of the light source

Salient Features of Atomic Absorption Spectrophotometer

becomes a long light spot, which enters into the slit. Therefore

(AAS)-(Model: Acm-10080-320-N

the light flux of double beam is enhanced.

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Built-in computer data processing and LCD: adopting

Long-life and anti-corrosive atomization system: The

highly integrated micro digital circuit, which is stable and

burner is made of new type titanium alloys, anti-corrosive and

reliable with the functions of integral holding, peak height and

fast thermal equilibrium. It meets the requirement of

area, auto zero adjusting, deuterium lamp and background,

measurement sensitivity without water-cooling.

multi-linear and nonlinear curves fitting, various parameters

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and working curves displayed in screen and report printing,

absorption, flame emission, graphite furnace atomic

etc. It is equipped with interface for externally linking PC.

absorption (AS-3020 automatic sample feeder can be

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installed) and hydride generation.

Good basic line stability: Double-beam system of

Multi-functional analysis mode: for methods of flame

optimized design can automatically compensate the light

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source drift and wavelength drift caused by the variation of

quick gas conversion and safety protection can be used to

temperature (with the function of the eliminating the affection

analyze air-acetylene flame as well as nitrous oxide-acetylene

of wavelength drift on the base line stability) and electronic

flame and extend the analytic elements to reach more than 60.

Safe and reliable gas path system: Special devices of

circuit drift so as to reach a good basic line stability. The cathode lamp needs not be pre-heated for long time and

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Complete set of accessories: to be supplied with the

instrument and ready for use after they are purchased.

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Technical Specifications •

Working spectral range

190nm-900nm

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Wavelength accuracy

< _ ±0.5nm

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Wavelength repeatability

< _ 0.3nm (single direction)

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Spectrum bandwidth

0.2nm, 0.4nm, 0.7nm, 1.4nm, 2.4nm, 5.0nm

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Resolution

<40%.

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Base line stability

< _ 0.004Abs/30min

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Characteristic concentration

Characteristic concentration of copper ? 0.04µg/ml/1%

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Detection limit

Detection limit of copper ?0.008?g/ml

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Background calibration ability

Greater than 30 times.

ATOMIC Absorption Spectrophotometer Light-source system

Hollow cathode lamp power supply: with adjustable current Deuterium Lamp power supply: with fixed current

Optical system

Double beam total refection system, C-T type monochromator Flashing wavelength: 250nm

Flame atomization system

Inter-changeable titanium alloy burner of 10cm and 5cm slits. Gas path is equipped with pressure indication,high precision voltage stabilizing flow adjustment, fast conversion of air and nitrous oxide, gas supply cut off, power cut off, prevention of flashback and logic interlock protection devices.

Signal processing

Build-in microprocessor and LCD. Signal amplifying modes: absorptance, concentration, emission and emission concentration; Standard curves: linear regression, curve fitting and multi-point standard calibration. Average value, standard deviation, relative standard deviation and correlation coefficient can be worked out. Standard curves, atomic absorption peak diagram, spectrum outline sketch, data as well as instrument parameters list and analytical reports can be displayed and printed out.

Standby Interface

RS 232 or USB

Instrument power supply

220V, 3A, 50Hz

Instrument Dimension

1000mmx530mmx425mm

Instrument Weight

130kg

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PVT.

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Accessories Main accessories supplied with the instrument

Several decades of accessories including air compressor, printer, one piece of (Zn/Cu) and K. Gas external pipe, acetylene cylinder pressure-reducing valve and water knockout gas filter.

As3020 graphite furnace a utomatic sample feeder

Used to improve automation and measurement precision

HGA graphite furnace system

Used to conduct trace and ultra-trace analysis with an absolute sensitivity of 10-10-10-12 gram.

5cm long-life titanium burner

The necessary accessory for nitrous oxide-acetylene flame analysis.

Hydride generator (Totally automatic)

Making the characteristic concentration of As, Se, Sb, Bi, Pb, Sn, Te, Ge, In, Tl, Cd and Zn lower than ppb level with cold atomic mercury measurement method.

Nitrous oxide generator (Totally automatic)

The necessary accessory for nitrous oxide-acetylene flame analysis.

Hollow cathode lamp Graphite tube

All specifications are available.

All specifications are available.

ACMAS TECHNOCRACY PVT. LTD. www.measuring-meters.com | www.acmasindia.com | www.scientificlaboratoryequipments.com

www.measuring-meters.com | www.acmasindia.com | www.scientificlaboratoryequipments.com

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