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Chapter 21: QA E (page 554)

Li was determined by atomic emission with the method of standard addition. Prepare a standard addition graph (Section 5 - 3) to find the concentration of Li and its uncertainty in pure unknown. The Listandard contained 1.62渭驳尝颈/mL.

Short Answer

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The standard addition graph:

Step by step solution

01

Definition of atomic emission.

Atomic emission spectroscopy (AES) is a chemical analysis method that employs the intensity of light produced at a certain wavelength from a flame, plasma, arc, or spark to quantify the amount of an element in a sample.

02

The standard addition graph.

The Li standard contained 1.62渭驳尝颈/mL.

The x intercept of the graph plotting intensity versus the concentration of the additional standard is 0.162卤0.005渭驳/mL.

After 10 times diluting the sample, the original concentration will be 0.162卤0.005渭驳/mL.

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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 between 87Rb+and 87Sr+. A dynamic reaction cell with converts to but does not convertRb+to RbF+. How does this reaction eliminate interference?

In which technique, atomic absorption or atomic emission, is flame temperature stability more critical? Why?

Figure 21 - 10shows a temperature profile for a furnace atomic absorption experiment. Explain the purpose of each different part of the heating profile.

(a) The atomic absorption signal shown here was obtained with0.0485渭驳Fe/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.)

The measurement of Li in brine (salt water) is used by geochemists to help determine the origin of this fluid in oil fields. Flame atomic emission and absorption of Li are subject to interference by scattering, ionization, and overlapping spectral emission from other elements. Atomic absorption analysis of replicate samples of a marine sediment gave results in the table.

(a) Suggest a reason for the increasing apparent concentration of Li in samples 1 through 3 .

(b) Why do samples 4 through 6 give an almost constant result?

(c) What value would you recommend for reporting the real concentration of Li in the sample?
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