10. (3 pts.) The measurement of Li in brine (salt water) is used by geochemists

Question

10. (3 pts.) 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? d. Suggest another method for removing interferences in this analysis. e. What value do you recommend for reporting the real concentration of Li in the sample? 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? d. Suggest another method for removing interferences in this analysis. e. What value do you recommend for reporting the real concentration of Li in the sample? 10. pts. The measurement ofLi 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 ofreplicate sample of Li in a brine sample gave results in the table. air C2H2 I. None 25.1 standard curve 2. Dilute 1/10 with H20 64.8 standard curve air/CH air C2H2 3. Dilute 1/10 with H.O 82.5 standard addition 4, None 77.3 standard curve N2O/C2H2 N2O/C2H2 5. Dilute 1/10 with Hao 79.6 standard curve 6. Dilute 1/10 with H O 80.4 N2O/C2H2 standard addition 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? d. Suggest another method for removing interferences in this analysis. e. What value do you recommend for reporting the real concentration of Liin the sample?

Explanation / Answer

Ans a, On dilution with Water no. of ions of Li in sample increases hence increasing its concentration during its detection by Flame atomic adsorption.

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