User:Tamanika Tinsley/Notebook/Chem 581 Biomaterials Design Lab/2014/09/24

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Sept 24 - AA analysis of As samples

  • Group Members Andrew Farag Sr (Undergrad) and Michael Bible Jr (Undergrad)
  • Group Name : AMT

Objective

  1. Continue processing films from last week
  2. Make two new films
    1. One containing the exchanged clay that your group made
    2. One containing the exchanged clay that another group made
  3. Run AA on the arsenic samples
    1. Make As standards (Note: AA will consume around 5mL of sample)
      1. 0ppm
      2. 10ppm
      3. 20ppm
      4. 30ppm
      5. 40ppm
      6. 50 ppm
    2. Dilute your samples so that their original concentration falls somewhere in this range.
    3. Make calibration curve and determine the concentration of As using AA.
Objective from Dr. Hartings lab notebook Dr. Hartings' Notebook

The original objective were modified, because the Arsenic lamp for the AA was burnt out. The new goal for the class was to set up an experiment with the PVA and PVA with clay films using lead.

Notes

Today we made films using the cation exchange clays begun on September 10. One of the films was made using the tributylhexadecylphosphonium bromide that our group started on 9/10 and the other was made using (1-hexadecyl)triphenylphosphonium bromide that Eleni's group started synthesizing on 9/10.

Our cation exchanged clays were made as follows:

  • PVA + tributylhexadecylphosphonium bromide exchanged clay
    • Mass of PVA = 1.0025g
    • Mass of tributylhexadecylphosphonium bromide = .1100g
    • Volume of Water = 7.0 mL
  • PVA + (1-hexadecyl)triphenylphosphonium bromide exchanged clay
    • Mass of PVA = 0.9995g
    • Mass of (1-hexadecyl)triphenylphosphonium bromide = 0.1103g
    • Volume of water = 7.2 mL


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