Trace amounts of rare clements are found within groundwaterand are of interest to goochemists. Earopium and terbium are30 -lanthanide-scries clements that can be measured from theintensity of their fluorescence emittcd when a solution isilluminated with ultraviolet radiation. Certain organic25 -compounds that bind Eu(III) and Tb(IIl) enhance thecmission, and substances found in natural waters can decrease20-the cmission. For that reason it is necessary to use standardEu (II)additions to the sample to correct for such interference. Thegraph shows the result of such an cxperiment in which the15-concentration of Eu(III) and Tb(III) was mcasured in asample of groundwatler. The x-intercept of the Eu(III) plot is10--23.1 ml. and the x-intercept of the Th(III) plot is -9.91 ml.In cach case, 10.00 ml. of the sample solution and 15.00 ml.5-Tb (III)of an organic additive were added to a scries of live 50 ml.volumctric flasks. The standard Eu(lI) or Th(III) solution (0,5.00, 10.00, 15.00, and 20.00 ml.) was then added to the-25 -20 -15 -10 50 5 10 15 20 25Added volume of Standard (mlL)flasks and they were diluted to 50.0 ml. with water.The Eu(III) standards added to the groundwater sample contained 0.160 ng/ml. (ppb) of Eu(III). Calculate the concentration ofEu(III) in the groundwater sample.Eu(III) concentration:ng/ml.The Tb(III) standards added to the groundwater sample contained 16.0 ng/ml. (ppb) of Tb(III). Calculate the concentration ofTh(III) in the groundwater sample.Th(III) concentration:ng/ml.Emission

Answered: Image /qna-images/answer/b6f77ab4-125e-4a23-b357-c40624eadd35.jpg

The Eu(III) standards adled to the groundwater sample contained 0.160 ng/ml. (ppb) of Eu(llI). Calculate the concentration of Eu(lII) in the groundwater sample. Eu(III) concentration: ng/ml. The Th(III) standards adkled to the groundwater sample contained 16.0 ng/ml. (ppb) of Tb(III). Calculate the concentration of Th(III) in the groundwater sample. Th(III) concentration: ng/ml.

The Eu(III) standards adled to the groundwater sample contained 0.160 ng/ml. (ppb) of Eu(llI). Calculate the concentration of Eu(lII) in the groundwater sample. Eu(III) concentration: ng/ml. The Th(III) standards adkled to the groundwater sample contained 16.0 ng/ml. (ppb) of Tb(III). Calculate the concentration of Th(III) in the groundwater sample. Th(III) concentration: ng/ml.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter26: Molecular Absorption Spectrometry

Section: Chapter Questions

Problem 26.31QAP

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