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

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Objectives

  • Crosslink Na-MT films.
    • Please refer to Moira Esson's entry for all calculations and observations.
    • The following films were crosslinked: PVOH (MW 22000), 0.8 wt% glutaraldehyde, 0.1 wt% 100% CEC NaMT; PVOH (MW 22000), 0.8 wt% glutaraldehyde, 0.1 wt% NaMT; PVOH (MW 22000), 0.8 wt% glutaraldehyde, PDMS.
  • 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]
19.52-215.5
29.48-207.5
59.47-207.9
109.43-211.7
159.45-151.1


Image: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]
7.419.53-201.2
1018.47-174.1
7.459.52-200.5
1058.45-172.5
7.4108.51-172.3
10109.53-199


50% CEC (Na-MT)-CuSO4 Filtrate

Cu+2 Concentration [ppm] Time [min] ISE [mV]
7.41-172.7
101-171.4
7.45-174.8
105-174.2
7.410-168.9
1010-172.8


Unmodified (Na-MT)-CuSO4 Filtrate

Cu+2 Concentration [ppm] Time [min] pH ISE [mV]
7.418.37-128.2
1018.45-142.1
7.458.47-112.7
1058.5-99.2
7.4108.44-138
10108.44-134.5

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.


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