Quantitative Chemical Analysis
Quantitative Chemical Analysis
9th Edition
ISBN: 9781464135385
Author: Daniel C. Harris
Publisher: W. H. Freeman
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Chapter 21, Problem 21.12P
Interpretation Introduction

Interpretation:

The mean annual flux of each metal has to be calculated.

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Explanation of Solution

The metals that are present in the snow was identified by atomic fluorescence.  The mean annual flux for the metals can be calculated as shown below,

For Pb :

(104±17pgPbgsnow)(11.5gsnowcm2) = 1196±196pgPbcm2(1196±196pgPbcm2)(1ng1000pg) = 1.2±0.2ngPbcm2

The mean annual flux of Pb is 1.2±0.2ngPb/cm2 .

For Tl :

(0.43±0.087pgTlgsnow)(11.5gsnowcm2) = 4.945±1.0005pgTlcm2(4.945±1.0005pgTlcm2)(1ng1000pg) = 0.005±0.001ngTlcm2

The mean annual flux of Tl is 0.005±0.001ngTl/cm2 .

For Cd :

(3.5±0.087pgCdgsnow)(11.5gsnowcm2) = 40.25±1.0005pgCdcm2(40.25±1.0005pgCdcm2)(1ng1000pg) = 0.04±0.01ngCdcm2

The mean annual flux of Cd is 0.04±0.01ngCd/cm2 .

For Zn :

(174±26pgZngsnow)(11.5gsnowcm2) = 2001±299pgZncm2(2001±299pgZncm2)(1ng1000pg) = 2.0±0.3ngZncm2

The mean annual flux of Zn is 2.0±0.3ngZn/cm2 .

For Al :

(6100±1700pgAlgsnow)(11.5gsnowcm2) = 70150±19550pgAlcm2(70150±19550pgAlcm2)(1ng1000pg) = 7(±2)×101ngAlcm2

The mean annual flux of Al is 7(±2)×101ng/cm2 .

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a. What is the eluent used in the column chromatography here (a “silica plug filtration” is essentially a very short column)? b. The spectroscopy of compound 5b is described in the second half of this excerpt, including 1H-NMR and 13C-NMR (which you will learn about in CHEM 2412L), MS (which you will learn about later in CHEM 2411L) and IR. One of the IR signals is at 3530 cm-1. What functional group does this indicate might be present in compound 5b?
Steps and explanations. Also provide, if possible, ways to adress this kind of problems in general.
a. The first three lines of this procedure describe the reaction used to make compound 5b. In the fourth line, hexane and sodium bicarbonate are added. What organic lab technique is being used here?  b. What is the purpose of the Na2SO4?  c. What equipment would you use to “concentrate [a solution] under reduced pressure”?
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