Answered: Sample and Treatment Li (ug/mL)…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

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 absorption of Li is subject to interference by other elements. Atomic absorption of analysis of replicate sample of Li in a brine sample gave results in the table.

a. Suggest a reason for the increasing apparent concentration of Li from sample 1 to 2.

b. Suggest a reason for the increasing apparent concentration of Li from sample 1 to 3

c. Why do samples 4-6 give a nearly constant result?
(What type of interference you think is being eliminated?

Sample and Treatment
Li (ug/mL)
Calibration Method
Flame Type
1. None
25.1
standard curve
air/CH2
2. Dilute 1/10 with H20 64.8
standard curve
air/C;H2
3. Dilute 1/10 with H20 82.5
4. None
5. Dilute 1/10 with H20 79.6
6. Dilule 1/10 witlh H20 80.4
standard addition
air/C;H2
77.3
standard curve
N20/C;H2
standard curve
N;O/C;H2
slandard additiuu
N20/C;H2

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