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 standard addition air/C;H2 4. None 5. Dilute 1/10 with H20 6. Dilute 1/10 witlh H20 77.3 standard curve N20/C;H2 79.6 standard curve N20/C;H2 80.4 slandard addition N20/C;H2
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 standard addition air/C;H2 4. None 5. Dilute 1/10 with H20 6. Dilute 1/10 witlh H20 77.3 standard curve N20/C;H2 79.6 standard curve N20/C;H2 80.4 slandard addition N20/C;H2
Chapter31: Introduction To Analytical Separations
Section: Chapter Questions
Problem 31.30QAP
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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?
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