User:Douglas M. Fox/Notebook/AU CHEM-581 F2012 Lab Support/2012/09/18: Difference between revisions
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|style="background-color: #EEE"|[[Image:owwnotebook_icon.png|128px]]<span style="font-size:22px;"> Project | |style="background-color: #EEE"|[[Image:owwnotebook_icon.png|128px]]<span style="font-size:22px;"> Project 2: Instrumentation</span> | ||
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== | ==Atomic Absorption Flame Spectroscopy== | ||
* | AA Standards | ||
* 10 mL total solution stored in 15 mL centrifuge tubes | |||
* Used CuSO4 stock solution (13.30 ppm Cu<sup>2+</sup> as CuSO<sub>4</sub>) | |||
* Diluted with 16.7 MΩ DI | |||
* 100 - 1000 μL pipetters were sticking, so precision of solutions likely to be low | |||
* Prepared 10:0, 5:5, 2:8, & 1:9 dilutions | |||
<br> | |||
Cu exchange of NaMT | |||
#10 min exchange, 1:5 salt to clay | |||
#*0.100 g CuSO<sub>4</sub> in 20 mL DI | |||
#*Added 0.500 g NaMT | |||
#*Stirred 10 min ± 5 sec and filtered through 41 Whatman paper into <u>dried</u> filter flask | |||
#*filtrate stored in 20 mL vial & clay air-dried overnight | |||
#30 min exchange, 1:5 salt to clay | |||
#*0.100 g CuSO<sub>4</sub> in 20 mL DI | |||
#*Added 0.500 g NaMT | |||
#*Stirred 30 min ± 1 min and filtered through 41 Whatman paper into <u>dried</u> filter flask | |||
#*filtrate stored in 20 mL vial & clay air-dried overnight | |||
#60 min exchange, 2:2 salt to clay | |||
#*0.200 g CuSO<sub>4</sub> in 20 mL DI | |||
#*Added 0.200 g NaMT | |||
#*Stirred 60 min ± 2 min and filtered through 41 Whatman paper into <u>dried</u> filter flask | |||
#*filtrate stored in 20 mL vial & clay air-dried overnight | |||
<br> | |||
AA Clay Exchange Solutions | |||
* 10 mL total solution stored in 15 mL centrifuge tubes | |||
* Used clay exchange filtrate solutions | |||
* Diluted with 16.7 MΩ DI | |||
* 100 - 1000 μL pipetters were sticking, so precision of solutions likely to be low | |||
* Mixed 50 μL filtrate and 9.950 mL DI | |||
* 2:5 salt to clay (10 min, 30 min, 2 hr, & 24 hr) and 1:1 (1 hr) | |||
<br> | |||
AA Flame Spectroscopy | |||
* Cu lamp, 0.2 cm slit | |||
* AA Wizard, single measurement per sample | |||
{|style = "width:600px" | |||
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|<u>Sample</u> | |||
|<u>[Cu<sup>2+</sup>] (ppm, measured)</u> | |||
|<u>[Cu<sup>2+</sup>] (ppm, solution)</u> | |||
|<u>[Cu<sup>2+</sup>] (ppm, adsorbed)</u> | |||
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|Water | |||
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|24hCu1-5 | |||
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|2hCu1-5 | |||
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|Cu1-5 | |||
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|1hCu2-2 | |||
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Revision as of 18:25, 23 September 2012
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Atomic Absorption Flame SpectroscopyAA Standards
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