User:Karlena L. Brown/Notebook/PVOH Research/2012/10/09: Difference between revisions

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* The ionic strength pH adjuster adjusted the pH of the solutions between 8 and 10
* The ionic strength pH adjuster adjusted the pH of the solutions between 8 and 10
* The solvent used to dilute each solution was distilled H<sub>2</sub>O
* The solvent used to dilute each solution was distilled H<sub>2</sub>O




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| 10ppm Cu<sup>2+</sup> unmodified Na-MT 10min||8.44||-134.5
| 10ppm Cu<sup>2+</sup> unmodified Na-MT 10min||8.44||-134.5
|}
|}


==DSC Sample Preparation==
==DSC Sample Preparation==

Revision as of 21:59, 22 October 2012

PVOH Research <html><img src="/images/9/94/Report.png" border="0" /></html> Main project page
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OBJECTIVES

  • Remake CuSO4 standard solutions for atomic absorption
  • Use the ion selective electrode to measure all Na2SO4 solutions established
  • Prepare PVOH samples for DSC testing and analysis
  • Collect all data and experimental results from DSC testing and analysis

Ion Selective Electrode Procedures

Ion Selective Electrode Sample Preparations & Results

Before collecting sample measurements from the ion selective electrode instrument:

  • Upon testing the pH of the standard solutions, it was concluded that the pH was too low (~7.8)
  • Therefore, pH adjustments made for each solution: 0.1mL of ionic strength adjuster (4M pH adjuster containing NaOH) + 3mL of sample solution
  • The ionic strength pH adjuster adjusted the pH of the solutions between 8 and 10
  • The solvent used to dilute each solution was distilled H2O


ISE and pH measurements

Solution Tested pH of solution with adjustment ISE values with adjustment[mV]
1ppm CuSO4 9.52 -215.5
2ppm CuSO4 9.48 -207.5
5ppm CuSO4 9.47 -207.9
10ppm CuSO4 9.43 -211.7
15ppm CuSO4 9.45 -151.1
7.4ppm Cu2+ 100%CEC 1min filtrate 9.53 -201.2
10ppm Cu2+ 100%CEC 1min filtrate 8.47 -174.1
7.4ppm Cu2+ 100%CEC 5min filtrate 9.52 -200.5
10ppm Cu2+ 100%CEC 5min filtrate 8.45 -172.5
10ppm Cu2+ 100%CEC 10min filtrate 8.51 -172.3
7.4ppm Cu2+ 100%CEC 10min filtrate 9.53 -199.0
7.4ppm Cu2+ unmodified Na-MT 1min 8.37 -128.2
10ppm Cu2+ unmodified Na-MT 1min 8.45 -142.1
7.4ppm Cu2+ unmodified Na-MT 5min 8.47 -112.7
10ppm Cu2+ unmodified Na-MT 5min 8.50 -99.2
7.4ppm Cu2+ unmodified Na-MT 10min 8.44 -138.0
10ppm Cu2+ unmodified Na-MT 10min 8.44 -134.5

DSC Sample Preparation

RECALL DSC PROCEDURES FROM 9/17/12

Film Type Sample Mass (mg) Pan / Lid Mass (mg)
Uncrosslinked Plain PVOH 130K 2.83 49.49
Uncrosslinked PVOH 22K, HCl 2.84 49.50
Uncrosslinked PVOH 130K, HCl 2.60 50.63
Uncrosslinked PVOH 130K, 10% succinic acid, HCl 2.99 50.36
Uncrosslinked PVOH 22K, H2SO4 3.05 48.94
Uncrosslinked PVOH 22K, H3PO4 3.01 48.43
Uncrosslinked PVOH 130K, H3PO4 2.96 49.73
Uncrosslinked PVOH 130K, 15% maleic acid, H3PO4 2.82 49.39
Uncrosslinked PVOH 130K, 15% succinic acid, H3PO4 2.82 50.05

Notes:



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