User:Samiye Yaman/Notebook/Lab 581/2012/10/05

Objective

Description

Conductivity of PVOH film

• Conductivity of PVOH was measured by using Thermo Scientific and Orion Versa Star.

• The probes were platinium,

• The cell constant for Thermo Scientific was 0.479.

• The cell constant for Orion Versa Star was 0.4663.

• After placing the film between two columns, a solution containing 100 ppm Cl-, 100 ppm Br- and 100 ppm SO4-2(as Na+ salts, in to the left column. Place HPLC water to the right column.

• Initial height for left column is 18.2 cm.

• Initial height for right column is 18.7 cm.

Data

• Final height of each column was not recorded as there was a leak between the columns.

Time Left column Right column

t=0 730us/cm 10.25us/cm

5 min

t=1 730us/cm 10.49us/cm

5 min

t=2 730us/cm 10.49us/cm

15 min

t=3 730us/cm 10.57us/cm

15min

t=4 731us/cm 10.65us/cm

30min

t=5 731us/ cm 10.72us/cm

30min

t=6 731us/cm 10.84us/cm

30min

t=7 732us/cm 10.84us/ cm

30min

t=8 732us/cm 10.90us/cm

• The conductivity after a week was not recorded because of the leak. The leak also prevent measurement of final height of the solutions in the column.

Notes

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