What are spectral interferences?

What are spectral interferences?

Spectral Interferences Spectral interference is caused by radiation overlap of absorption line due to emissions from another element or compound. Spectral interference is also effected by the radiation of an emission line of another element or compound, or background radiation from flame, solvent or sample.

What are the interferences in AAS?

Chemical interferences. Chemical interference occurs when an analyte is not totally decomposed in flame. There is less atoms present, and therefore a reduced absorbance of the analyte. Compound Formation. Anions SO4 and PO4 combines with metal to form stable compounds and decrease the absorption of the analyte.

Why are spectral interferences less severe in atomic absorption than in flame emission spectroscopy?

Skoog 10-8: Ionization interferences are less severe in the ICP than in flame emission because argon plasmas have a high concentration of electrons (from ionization of the argon) which represses ionization of the analyte. Emission spectra for many elements can be obtained with one set of excitation conditions.

What is the correct order of the components in a flame AAS?

The standard AAS instrument consists of four components: the sample introduction area, the light (radiation) source, the monochromator or polychromator, and the detector (figure 1).

How do you correct spectral interference?

The use of reaction and or collision cells to destroy molecular interfering ions. Cool plasma to reduce background interferences. Separation of analyte(s) – for example the use of chromatography or solvent extraction, etc.

Which is correct order of AAS?

The standard AAS instrument consists of four components: the sample introduction area, the light (radiation) source, the monochromator or polychromator, and the detector (figure 1). Figure 1. The basic components of an AAS system.

What is a releasing agent in AAS?

a) A releasing agent is a substance that reacts preferentially with a chemical interference, thus preventing its interaction with the analyte. Protective agents prevent interference by preferentially forming stable but volatile species with the analyte.

What is the difference between FES and AAS?

As AAS is much more sensitive than FES, AAS is used as a reference method for many analytical procedures. In AAS, however, the flame serves to dissociate the element from its chemical bonds and place it in a ground state at which it is capable of absorbing light of a wavelength specific for the element.

Which flame is used in AAS?

air-acetylene flame
Chromium is typically determined by flame AAS using an air-acetylene flame or a nitrous oxide-acetylene flame. Although chromium has a large number of resonance lines of similar sensitivity, the 357.9 nm line is most commonly used.

Which is most widely used flame in AAS?

Flame atomizers The oldest and most commonly used atomizers in AAS are flames, principally the air-acetylene flame with a temperature of about 2300 °C and the nitrous oxide system (N2O)-acetylene flame with a temperature of about 2700 °C.

What is non spectral interference?

Non-spectral interferences can be divided in reversible, that is occurring while the sample is being measured, and irreversible matrix effects, that is clogging of the nebulizer and sampling orifices or deposition on the torch or in the ion lens stack.

What are the steps in AAS?

The main steps in using a flame atomic absorption spectroscopy for metal analysis are:

1. Selecting the elements in the sample to be measured.
2. Preparing solutions of the samples, using the conventional techniques of quantitative chemical analysis.
3. Preparing a set of calibrating solutions.

Which is an example of a spectral interference?

Spectral interference is also effected by the radiation of an emission line of another element or compound, or background radiation from flame, solvent or sample. Example2: Radiation interference in the determination of Na with Mg present, and in the determination of Iron with Cu or Ni present. Use alternate wavelength.

What causes spectral interference in the aas-50megs?

Spectral interference is caused by radiation overlap of absorption line due to emissions from another element or compound.

When did Kirchoff and Bunsen develop flame spectrometry?

Kirchoff and Bunsen correlated spectral lines with specific elements in 1855» and in I869 Janssen proposed a quantitative analysis technique based on a flame excitation source. Beginning in the late 1920’s, Lundegardh set the basis for modern analytical flame spectrometry by developing

What are chemical interferences in high temperature flames?

CHEMICAL INTERFERENCES AND IONIZATION IN HIGH TEMPERATURE FLAMES. Iowa State University, Ph.D., 1970 Chemistry, analytical University Microfilms, A XEROK Company, Ann Arbor, Michigan THIS DISSERATION HAS BEEN MICROFILMED EXACTLY AS RECEIVED CHETJIICAL INTERFERENCES AND IONIZATION IN HIGH TEMPERATURE FLAMES Donald Arthur Becker