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.
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.
Chapter24: Introduction To Spectrochemical Methods
Section: Chapter Questions
Problem 24.28QAP
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Transcribed Image Text:Attempt
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.
Se
The selenium content in a 0.153 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 1.86 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
Fluorescence intensity
volume (µL)
(arbitrary units)
0.00
54.3
20.0
64.5
40.0
76.7
60.0
91.1
80.0
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.
Transcribed Image Text:Se wt% =
0.00174
Incorrect
%
+
Incorrect
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