Hach DR/700 Procedures Manual page 301

PLATINUM
For surface finishing solutions
N,N'-Dimethyldithiooxamide Method*
1.
Dilute the
platinum bath
solution (sample) by
pipetting 1.0 mL of
the bath solution into
a 1000-mL
volumetric flask. Fill
the flask to the mark
with demineralized
water. Cap and invert
at least 10 times to
mix.
Note: If the platinum
bath solution has more
than 10 g/L (1.2 troy
oz./gal) of platinum, a
larger dilution is
necessary.
Note: The DR/700 must
be calibrated before
sample measurement.
See Calibration
following these steps.
*User calibration required; range is approximate.
(0 to 10 g/L)
2.
Pipet 15.0 mL of
the diluted sample
bath solution into a
clean 25-mL square
mixing bottle (the
prepared sample).
50-51
Method 8133
3.
Using a graduated
cylinder, fill a second
mixing bottle with
15 mL of
demineralized water
(the blank).