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:
|