Untitled Quiz

A type of matrix interference where the presence of components in the sample lead to an underestimation of the analyte's concentration.

Interference in analytical measurements caused by components in the sample other than the analyte.

A type of matrix interference where the presence of components in the sample lead to an overestimation of the analyte's concentration.

A technique used to determine the concentration of an analyte in a sample with interfering components, by adding known amounts of analyte to the sample and measuring the resulting change in absorbance.

A graph showing the relationship between the concentration of an analyte and its measured signal (e.g., absorbance).

A measured portion of a sample.

A technique used to measure analyte concentration in the presence of interference by adding specific amounts of known analyte to the sample and monitoring the response.

A measure of the amount of light absorbed by a substance; in spectrophotometry, it is directly proportional to concentration.

A problem in atomic absorption spectroscopy where the presence of other elements in the sample affects the measurement of the analyte's absorbance.

Phosphate interferes with determining the amount of calcium by absorbing the light used to measure calcium.

Adding lanthanum to a sample helps in atomic absorption spectroscopy to measure calcium which is masked by phosphate.

Using a hotter flame, such as a nitrous oxide-acetylene flame, can reduce chemical interferences by better decomposing analyte compounds.

A type of interference in atomic absorption spectroscopy where a hot flame creates excited states or ions depleting ground state atoms causing a lower absorption signal.

Substances added to a sample to reduce or eliminate ionization interference by creating free electrons which lower analyte ionization.

A hotter flame commonly used for atomic absorption spectroscopy which minimises chemical and ionization interferences.

A technique for measuring the concentration of chemical elements in a sample by measuring how much light is absorbed by free atoms.

A technique for accurately determining the concentration of an unknown sample when interference is present using known amounts of the analyte and plotting their increase on a calibration curve.

Factors affecting accurate analysis by affecting measurments; causing parallel/non-parallel slopes when using standard additions.

Occurs in atomization where a sample component forms a stable compound with the analyte, hindering complete atomization, leading to inaccurate readings.

Specific calibration curve used to find unkown concentration of sample using 'standard additions' method. Its slope is used to calculate the unknown.

Unwanted absorbance in the spectrum caused by components other than the analyte that isn't addressed in standard additions and produces a spurious signal.

In standard additions, a parallel slope on the spiked sample calibration curve to the aqueous standard line indicates no interference is present. A non-parallel slope indicates interference.

Step of sample vaporization to make free atoms, a critical part in atomic absorption spectroscopy. Interferences can occur this important step.

Interferences in signal measurement that affects the signal intensity in atomic absorption.