User:Melissa Novy/Notebook/CHEM-581/2012/10/03

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Objectives

  • Crosslink Na-MT films.
  • Adjust the pH of CuSO4 solutions made on 2012/09/28, then take ISE measurements.

CuSO4 Standard, Na+ Standard, and Na-MT Filtrate Solutions

  • Please refer to the ISE protocol on 2012/09/28 for how ISE measurements were taken.
    • 3 mL of the solutions were added to 0.1 mL of ionic strength adjuster (4 M solution containing NaOH) to adjust the pH to a value between 8 and 10.
    • The solutions were allowed to equilibrate with the electrode for 2 min.
  • Dilutions of 5 mL each of 1, 5, 10, 15, and 20 ppm Na+ in pure H2O were made from a 1000 ppm Na+ solution, then ISE measurements were taken.
  • Calculations
  5 mL 20 ppm Na+ requires:
  (1000 ppm Na+)V1=(20 ppm Na+)(5 mL)
  V1=100 μL


  5 mL 10 ppm Na+ requires:
  (1000 ppm Na+)V1=(10 ppm Na+)(5 mL)
  V1=50 μL


  5 mL 5 ppm Na+ requires:
  (1000 ppm Na+)V1=(5 ppm Na+)(5 mL)
  V1=25 μL


  5 mL 5 ppm Na+ requires:
  (1000 ppm Na+)V1=(5 ppm Na+)(5 mL)
  V1=25 μL


  5 mL 1 ppm Na+ requires:
  (1000 ppm Na+)V1=(1 ppm Na+)(5 mL)
  V1=5 μL


CuSO4 Standard Solutions

Concentration [ppm] pH ISE [mV]
1 9.52 -215.5
2 9.48 -207.5
5 9.47 -207.9
10 9.43 -211.7
15 9.45 -151.1


CuSO4 ISE Standards.JPG

Na+ Standard Solutions

Concentration [ppm] ISE [mV]
1 -147
5 -158
10 -145.5
20 -132.3


100% CEC (Na-MT)-CuSO4 Filtrate

Cu+2 Concentration [ppm] Time [min] pH ISE [mV]
7.4 1 9.53 -201.2
10 1 8.47 -174.1
7.4 5 9.52 -200.5
10 5 8.45 -172.5
7.4 10 8.51 -172.3
10 10 9.53 -199


50% CEC (Na-MT)-CuSO4 Filtrate

Cu+2 Concentration [ppm] Time [min] ISE [mV]
7.4 1 -172.7
10 1 -171.4
7.4 5 -174.8
10 5 -174.2
7.4 10 -168.9
10 10 -172.8


Unmodified (Na-MT)-CuSO4 Filtrate

Cu+2 Concentration [ppm] Time [min] pH ISE [mV]
7.4 1 8.37 -128.2
10 1 8.45 -142.1
7.4 5 8.47 -112.7
10 5 8.5 -99.2
7.4 10 8.44 -138
10 10 8.44 -134.5

Notes

  • The 1 ppm Na+ solution gave an ISE value that did not fit the expected calibration curve. This may be because the detection limit of the ISE measurements is above 1 ppm. It was recommended that a solution of higher Na+ ppm, such as 25 ppm Na+ be tested to generate a more accurate calibration curve.
  • The ISE values of the CuSO4 solutions are meaningless as they were obtained with a sodium electrode.