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.

Which detector is used in ICP-OES?

Detectors. Historically, light intensity was measured with photomultiplier technology. Currently, solid-state charge transfer devices (CTDs) are the detectors of choice for ICP-OES and have almost completely replaced photomultiplier tubes.

How do I get rid of spectral interference?

This is necessary because an oxide or hydroxide species of one element can interfere spectrally with the analyte element. The problem can be alleviated by using a sample desolvation device, such as a chilled spray chamber, to reduce oxide formation but unfortunately cannot be eliminated completely.

How can spectral interference be prevented?

Avoidance: ICP-OES Several modern ICP instruments have the capability of avoiding the spectral interference by going to another line. Many instruments can make measurements simultaneously on several lines for 70+ elements in the same time it used to take to make a measurement on a single line/element combination.

What are chemical interferences?

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.

What are non spectral interferences?

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.

Why is argon used in ICP-OES?

Argon is important for OES Spectrometers analyzing light elements such as Carbon, Phosphorous, Sulfur, and Nitrogen. These elements are below 200 nanometers (nm) in wavelength and the argon allows the optic of a spectrometer to see from 200 and below.

What are the main interferences found in ICP MS?

There are two main types of interferences: isobaric and polyatomic. Isobaric interferences refer to different elements whose isotopes share a common mass. For example, both Fe and Ni have isotopes at mass 58. Therefore, any signal measured at m/z 58 will have contributions from both Fe and Ni.

What is non spectral interference?

What is spectral interference ICP-OES?

The three main types of interferences that are encountered during ICP-OES analysis are of spectral, physical and chemical nature. Spectral interferences are characterized by an overlap (either partial or direct) of the analyte of interest by an interfering element.

Where do chemical interferences originate?

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.