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Chemical standard (Fricke)

Determine

M = mole Fe

3+

/liter

- Fe

3+

strong absorption peak at

= 304 nm, Fe

2+

not

- measure UV transmissions through Fricke samples:

Fe

2+

in H

2

O

uv

I

0

before irradiation:

Fe

2+

and

Fe

3+

in H

2

O

uv

I

after irradiation:

M

=

log(I

0

/I)

·L

= 2187 liter mole

-1

cm

-1