LaMotte FOOD SERVICE SERVICEMAN KIT - Manual (Page 2)

PHENOLPHTHALEIN (P) AL KA LIN ITY
1.
Fill the test tube (0970-S) to the 10 mL line with sample water.
2. Add 3 drops of *Phenolphthalein Indicator, 1% (2246). Cap and
mix. If solution does not turn red, the P Alkalinity is zero.
3. If solution does turn red, the P Alkalinity is determined by drop
count. Fill the pipet (0392) with the *Sulfuric Acid, 0.25N (6402).
Hold the pipet perpendicular over the test tube and slowly add the
*Sulfuric Acid, 0.25N one drop at a time, while gently swirling the
tube. Count the drops and continue the addition until the color
disappears. If T Alkalinity is to be measured also hold the solution
in the tube for the test below.
4. The P Alkalinity test result is calculated from:
Number of Drops of Reagent x 62.5 = ppm Phenolphthalein
Alkalinity expressed as ppm Calcium Carbonate (CaCO
3
)
TO TAL (T) AL KA LIN ITY
1.
Use the sample from the P Alkalinity test above, or fill the tube to
the 10 mL line with a new water sample.
2. Add 3 drops of Total Alkalinity Indicator (2786). Cap and mix.
Solution will turn green-blue color.
3. Fill the pipet (0392) with the *Sulfuric Acid, 0.25N (6402). Add
the reagent slowly to the solution, one drop at a time, while gently
swirling the tube. Count the drops and continue until the green-
blue color changes to pink.
4. The T Alkalinity test result is calculated from:
Total Number of Drops of Reagent x 62.5 = ppm Total Alkalinity
expressed as ppm Calcium Carbonate (CaCO
3
)
NOTE: If the same sample is used for both P and T Alkalinity, add
both drop counts to calculate T Alkalinity.
HARD NESS
1.
Fill the test tube (0970-S) to the 5 mL line with sample water.
2. Add 5 drops of *Hardness Reagent #5 (4483). Swirl to mix.
3. Add 1 Hardness Reagent #6 Tablet (4484). Swirl until tablet
disintegrates. Solution will turn red.
4. Fill the pipet (0392) with Hardness Reagent #7. While gently
swirling tube add Hardness Reagent #7 until red color changes to a
clear blue. Count the number of drops added. Hold pipet vertically.
Total Hardness, gpg (CaCO
3
) = Number of Drops of Reagent #7
IRON
1.
Rinse test tube (0970-S) with sample water. Fill test tube
approximately c” with sample water.
2. Add one *Iron LR Tablet (3725). Crush with stirring rod (0519).
3. Fill the tube to the 10 mL line with sample water. Mix until tablet
disintegrates. Wait 5 minutes.
4. Hold the test tube against the white background of the Iron color
chart (3289-CC). Match the sample to a color standard. Record as
ppm Iron.
CHLO RINE (BLEACH) IN FAB RIC
1.
In an inconspicuous area place one drop of the *Chlorine Reagent
O-Tolidine (4100).
2. The presence of chlorine is indicated by the formation of a yellow
color. With a high level of chlorine a brownish color could be
observed.
CAUTION:
Rinse the test area of the fabric immediately after
tesing since it is strongly acid and could cause future damage to the
fabric.