Difference between revisions of "User:Abigail E. Miller/Notebook/CHEM571 Lab Project/2012/10/08"

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|style="background-color: #EEE"|[[Image:BDLlogo_notext_lr.png|128px]]<span style="font-size:22px;"> CHEM571 </span>
 
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For the AAS (atomic absorption Spectrometer), the published detection limit for gold is 0.2 ppm ( a 1% absorbance) for this instrument. recent experiments put the detection limit closer to 2 ppm for gold, and since 20 ppm is roughly 0.1 mM Au, therefore I created standards ranging from 5 to 40 ppm.
 
For the AAS (atomic absorption Spectrometer), the published detection limit for gold is 0.2 ppm ( a 1% absorbance) for this instrument. recent experiments put the detection limit closer to 2 ppm for gold, and since 20 ppm is roughly 0.1 mM Au, therefore I created standards ranging from 5 to 40 ppm.
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For reference the molecular weight of gold is 197 g/mol.
  
 
* created 50 mL of each standard: 5, 8, 10, 15, 20, 25, 30, 40 ppm Au  
 
* created 50 mL of each standard: 5, 8, 10, 15, 20, 25, 30, 40 ppm Au  

Latest revision as of 21:06, 26 September 2017

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Objective

  • To create standard solution of gold for calibration of the atomic absorption spectrometer. The students will measure the gold content of their BSA nucleated AuNPs against these standards.

Bench Work

  • 1000 ± 10μg of Au/mL of solution ( 10 % v/v HCl) for the stock solution
    • from Inorganic Ventures cat# AAAU1-1, lot # F2-AU04012
    • the solution is certified by ICP (ion couple plasma spectroscopy) to NIST SRM 3121

For the AAS (atomic absorption Spectrometer), the published detection limit for gold is 0.2 ppm ( a 1% absorbance) for this instrument. recent experiments put the detection limit closer to 2 ppm for gold, and since 20 ppm is roughly 0.1 mM Au, therefore I created standards ranging from 5 to 40 ppm.

For reference the molecular weight of gold is 197 g/mol.

  • created 50 mL of each standard: 5, 8, 10, 15, 20, 25, 30, 40 ppm Au
    • from the 1000 ppm Au stock standard
    • using 50 mL volumetric flasks
    • all diluted in 1 M HCl
ppm mL of 1000 ppm stock added
5 0.25
8 0.40
10 0.50
15 0.75
20 1.00
25 1.25
30 1.50
40 2.00

Data/Spectra

  • N/A - solutions will be used for AAS on 10/9/2012

Notes

  • N/A