Macmillan Learning The selenium content in soil can be determined fluorometrically upon conversion of the selenium to the fluorescent product shown, followed by extraction in cyclohexane. Emission from the fluorescent product is observed at 518 nm. N Se The selenium content in a 0.110 g soil sample was converted to the fluorescent product and extracted in 50.0 mL of cyclohexane. The method of standard additions was used to determine the selenium content in the soil sample. Initially, 3.00 mL of the cyclohexane solution were placed in a cuvette for fluorescence determination. Several small additions of a 1.88 µg Se/mL standard solution containing the fluorescent product were added to the 3.00 mL solution in the cuvette. The fluorescence was measured at 518 nm. The results are shown in the table. Total added Se standard volume (µL) Fluorescence intensity (arbitrary units) 0.00 20.0 40.0 54.3 64.5 76.7 60.0 80.0 91.1 108.3 Determine the weight percent (wt%) of selenium in the soil sample and find the absolute uncertainty in the weight percent of selenium. Report the weight percent and absolute uncertainty with three significant figures. 0.0514 Se wt% = % Incorrect Answer +1 0.0001 % Incorrect Answer
Macmillan Learning The selenium content in soil can be determined fluorometrically upon conversion of the selenium to the fluorescent product shown, followed by extraction in cyclohexane. Emission from the fluorescent product is observed at 518 nm. N Se The selenium content in a 0.110 g soil sample was converted to the fluorescent product and extracted in 50.0 mL of cyclohexane. The method of standard additions was used to determine the selenium content in the soil sample. Initially, 3.00 mL of the cyclohexane solution were placed in a cuvette for fluorescence determination. Several small additions of a 1.88 µg Se/mL standard solution containing the fluorescent product were added to the 3.00 mL solution in the cuvette. The fluorescence was measured at 518 nm. The results are shown in the table. Total added Se standard volume (µL) Fluorescence intensity (arbitrary units) 0.00 20.0 40.0 54.3 64.5 76.7 60.0 80.0 91.1 108.3 Determine the weight percent (wt%) of selenium in the soil sample and find the absolute uncertainty in the weight percent of selenium. Report the weight percent and absolute uncertainty with three significant figures. 0.0514 Se wt% = % Incorrect Answer +1 0.0001 % Incorrect Answer
Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter10: Atomic Emission Spectrometry
Section: Chapter Questions
Problem 10.11QAP
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Transcribed Image Text:Macmillan Learning
The selenium content in soil can be determined fluorometrically upon conversion of
the selenium to the fluorescent product shown, followed by extraction in cyclohexane.
Emission from the fluorescent product is observed at 518 nm.
N
Se
The selenium content in a 0.110 g soil sample was converted to the fluorescent product
and extracted in 50.0 mL of cyclohexane. The method of standard additions was used to determine the selenium content in the
soil sample. Initially, 3.00 mL of the cyclohexane solution were placed in a cuvette for fluorescence determination. Several small
additions of a 1.88 µg Se/mL standard solution containing the fluorescent product were added to the 3.00 mL solution in the
cuvette. The fluorescence was measured at 518 nm. The results are shown in the table.
Total added Se standard
volume (µL)
Fluorescence intensity
(arbitrary units)
0.00
20.0
40.0
54.3
64.5
76.7
60.0
80.0
91.1
108.3
Determine the weight percent (wt%) of selenium in the soil sample and find the absolute uncertainty in the weight percent of
selenium. Report the weight percent and absolute uncertainty with three significant figures.
0.0514
Se wt% =
%
Incorrect Answer
+1
0.0001
%
Incorrect Answer
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