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Ilinca Daria Radulescu

on 28 May 2013

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Transcript of ICP-MS and ICP-OES

ICP-MS and ICP-OES Multi-element analysis technique that uses an inductively coupled plasma source to dissociate the sample into its constituent atoms or ions, exciting them to a level where they emit light at a characteristic wavelength.
A detector measures the intensity of the emitted light, and calculates the concentration of that particular element in the sample.
The sample experiences temperatures as high as 10,000 C, where even the most refractory elements are atomized with high efficiency. Conclusions ICP-MS can be used to measure the individual isotopes of each element; this capability brings value to laboratories interested in one specific isotope of an element or in the ratio between two isotopes of an element.
Easy to use
Multi-element, High productivity
Very economical for many samples and/or elements
Few chemical interferences
Robust interface
Excellent screening abilities
High total dissolved solids
Solid and organic samples
Moderate to low detection limits (but often much better than FAAS)
Spectral interferences possible
Some element limitations ICP-MS It is based on coupling together an inductively coupled plasma as a method of producing ions (ionization) with a mass spectrometer as a method of separating and detecting the ions. An ICP-MS consists of the following components Sample introduction system
ICP torch and RF coil
Vacuum system
Collision/reaction cell
Ion optics
Mass spectrometer
Data handling and system control Experiments
ICP-OES Experiments
ICP-MS The ICP-MS instrument measures most of the elements in the periodic table. An inductively coupled plasma spectrometer is a tool for trace detection of metals in solution, in which a liquid sample is injected into argon gas plasma contained by a strong magnetic field. The elements in the sample become excited and the electrons emit energy at a characteristic wavelength as they return to ground state. The emitted light is then measured by optical spectrometry. ICP-MS Highly sensitive Multielement analysis Isotopic speciation ICP-OES How does it work Sample Scan Process Software Samples are introduced into an argon plasma as aerosol droplets.
The plasma dries the aerosol, dissociates the molecules, and then removes an electron from the components,thereby forming singly-charged ions, which are directed into a mass filtering device known as the mass spectrometer. ICP-MS systems employ a quadrupole mass
spectrometer which rapidly scans the mass range. At any given time, only one mass-to-charge ratio will be allowed to pass through the mass spectrometer from the entrance to the exit. Upon exiting the mass spectrometer, ions
strike the first dynode of an electron multiplier, which serves as a detector.
The impact of the ions releases a cascade of electrons,which are amplified until they become a measurable pulse. The software compares the intensities of the measured pulses to those from standards, which make up the calibration
curve, to determine the concentration of the element.
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