LaMotte SULFUR DIOXIDE IN AIR TEST KIT - Manual (Page 2)

USE OF THE OCTET COM PARA TOR
The Octet Comparator contains eight
permanent color standards. A test sample is
inserted into the openings in the top of the
comparator. The sample can then be compared
to four color standards at once, and the value
read off the comparator. For optimum color
comparison, the comparator should be
positioned between the operator and a light
source, so that the light enters through the
special light-diffusing screen in the back of the
comparator. Avoid viewing the comparator
against direct sunlight or an irregularly lighted
background.
PRO CE DURE
1.
Add 10 mL of Sulfur Dioxide Absorbing Solution (7804) to the
impinging tube. Connect impinging apparatus to intake of air
sampling pump. Make sure the long tube is immersed in the
absorbing solution. Sample at 1.0 LPM for 30 minutes or until a
measurable amount of Sulfur Dioxide is absorbed. Cover impinging
apparatus with aluminum foil to protect from light.
2. At the end of the sampling time fill the small test tube (0230) to
the line with the absorbing solution from the impinging tube. Use
the 0.25 g spoon (0695) to add one level measure of *Sulfur
Dioxide Reagent #1 (7693). Cap test tube and shake vigorouly to
dissolve the powder.
3. Use a 1 mL pipet (0354) to add 1 mL *Sodium Hydroxide, 1.0N
(4004PS) to the same small test tube (0230). Cap and invert
several times to mix.
4. Use the other 1 mL pipet (0354) to add 2 mL (2 measures) of
*Sulfur Dioxide Passive Bubbler Indicator (7805) to a large test
tube (0204).
5. Pour the contents of the small test tube (0230) into the large test
tube (0204) containing the indicator. Immediately cap tube and
invert 6 times, holding cap firmly in place with index finger.
6. Wait 15 minutes. Place test tube into the Sulfur Dioxide Passive
Bubbler Comparator (7746). Match sample color to a color
standard. Record index number from comparator.
L Mott