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Chapter 21: Q14P (page 556)

Explain what is meant by spectral, chemical, ionization, and isobaric interference.

Short Answer

Expert verified

When analyte signals collide with signals from other elements in the sample, then the spectral interference happens. When a component of the sample lowers the amount of analyte atomization, then the chemical interference happens. The loss of analyte atoms due to ionisation is referred to as ionisation interference. Isobaric interference is caused by the presence of equivalent mass isotopes of multiple elements

Step by step solution

01

Define interference.

A substance other than the tested material that can be analysed by the chosen analytical method or can prevent the assayed material from being measured is referred to as an interference. Interferences lead to inaccurate analytical results.

02

Define spectral and chemical interference.

Spectral interference occurs when analyte signals collide with signals from other elements or molecules in the sample, as well as signals from the flame or furnace.

Chemical interference occurs when a component of the sample, through a chemical reaction, lowers the amount of analyte atomization.

03

Define ionization and isobaric interference.

The loss of analyte atoms due to ionisation is referred to as ionisation interference. The ionisation energy of Ba , for example, is smaller than the dissociation energy of BaO .

Isobaric interference is caused by the presence of equivalent mass isotopes of multiple elements in the sample solution.

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Most popular questions from this chapter

(a) Explain the purpose of the dynamic reaction cell in Figure 21-30. (b) In geologic strontium isotopic analysis, there is isobaric interference between87Rb+and87Sr+ . A dynamic reaction cell with CH3Fconverts to but does not convertRb+ toRbF+ . How does this reaction eliminate interference?

Concentrations (pg per g of snow) of metals by atomic fluorescence in the Agassiz Ice Cap in Greenland for the period1988 - 1992are P38b,1.04(卤0.17)脳102;TI,0.087;Cd,3.5卤0.87;Zn,1.74(卤026)脳102;andAl,6-1(卤1-7)脳103 . The mean annual snowfall was . Calculate the mean annual flux of each metal in units of ng/cm2. Flux means how much metal falls on eachcm2 .

Explain what is meant by spectral, chemical, ionization, and isobaric interference.

(a) The atomic absorption signal shown here was obtained with0.0485渭驳贵别/mLin a graphite furnace. The root-mean-square noise in the baseline, measured by the instrument's computer, is s=0.30 vertical units, where each horizontal line on the chart is 1 vertical

unit. Estimate where the baseline is beneath the tall signal and measure the height of the signal. Estimate the detection limit for Fe, defined as the concentration of Fe that gives a signal height of 3 s.

(b) Seven replicate measurements of a standard containing1.00ngHg/Lgave readings of 0.88,1.48,0.94,1.12,1.03,1.40, andin cold vapor atomic absorption (Box 21-1). From Equations 5-5 and 5 -6, estimate the detection and quantitation limits. (Note that in Equations 5-5 and 5-6, the quotient s / m is the standard deviation in concentration.)

(a) Explain the purpose of the dynamic reaction cell in Figure 21-30. (b) In geologic strontium isotopic analysis, there is isobaric interference between 87Rb+and 87Sr+. A dynamic reaction cell with converts to but does not convertRb+to RbF+. How does this reaction eliminate interference?

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