Collect the water sample by filling the plastic measuring tube(3, fig. 2-7) to the brim. Pour the sample into
the mixing bottle(5).
PHENOLPHTHALEIN INDICATOR SOLUTION May cause irritation if ingested. Do not ingest. In
the event of accidental ingestion, give large quantities of water. Call medic.
Add one drop of phenolphthalein indicator solution(4) to the water sample in the mixing bottle(5). Swirl to
If the water turns pink upon addition of indicator, the total acidity is zero.
SODIUM HYDROXIDE STANDARD SOLUTION Causes bums. Harmful if swallowed. Do not ingest
or allow contact with skin or eyes. In case of contact, immediately flush eyes and skin with water
for 15 minutes. Remove contaminated clothing. In case of ingestion, DO NOT induce vomiting.
Give large quantities of water. Give at least one ounce of vinegar in an equal amount of water.
Call medic in all cases.
If the water remains colorless during step (3), add standard sodium hydroxide solution(l) drop by drop until
the water just begins to turn pink. Count the drops as they are added. Record the number of drops.
Constantly swirl the mixing bottle(5) while adding the sodium hydroxide(l).
Interpretation of Results:
If the water is pink at the end of step (3), the total acidity is zero.
If not zero, the total acidity (in mg/l of calcium carbonate equivalents) is equal to 5 times the number of
drops of sodium hydroxide standard solution used.
188.8.131.52. Ferric Iron Test. High Range.
Purpose of Test: To determine the amount of ferric iron in water sample.
Range: 0 to 10.0 mg/l
Equipment Used: Found in Ferric Iron Test Kit, para 2.6.4, fig. 2-8 and in Main Carrying Case, para 1.8, fig. 1-1
FerroVer iron reagent for 5 ml sample, (21), fig. 1-1
Graduated cylinder, (31), fig. 1-1
Color-standard disk, 0 to 10.0 ml range, (2), fig. 2-8
Viewing tubes, (3), fig. 2-8
Color comparator, (4), fig. 2-8
General Techniques Used: Refer to paragraphs cited below as required by procedure.
Planning the Test, para 184.108.40.206
Cleaning Glassware, para 220.127.116.11
Handling and Storing Reagents, para 18.104.22.168
Collecting Water Samples, para 22.214.171.124
Mixing, para 126.96.36.199
Using Graduated Cylinders, para 188.8.131.52