TM 10-6630-245-13&P
(6)
Replace the cap on the tube and shake for 15 seconds. Some of the zinc reagent may not dissolve.
(7)
Immediately place the test sample in each of the holes in the zinc comparator block(l) and match the color
of the solution in the tube with the closest color of the solutions in the test block (zinc ppm comparator).
f.
Interpretation of Results:
NOTE
Your comparator is marked in units of parts per million (ppm). The ppm reading is also equal to
mg/1.
(1)
Find the color, or "shade" that most closely matches that in the tube. The concentration of zinc in parts per
million (ppm) is equal to two times the number for the sample in the zinc comparator that most closely
matches the color of the test sample. The color intensity may not match perfectly.
(2)
If the concentration of zinc in the sample is found to be 8 ppm (mg/l) or less, perform the low-range zinc
test in para 2.6.8.10.
2.6.8.10. Zinc Test. Low Range.
a. Purpose of Test: To determine the amount of zinc dissolved in water.
b. Range: 1.0 to 10 ppm
c.
Equipment Used: Found in Zinc Test Kit, para 2.6.5, fig. 2-11
Zinc comparator, (1), fig. 2-11
Zinc reagent, (2), fig. 2-11
Measuring spoon, 0.05g, (3), fig. 2-11
Measuring spoon, 0.5g, (4), fig. 2-11
Zinc conditioning reagent, (5), fig. 2-11
Two graduated test tubes, (6), fig. 2-11
Dropping pipet, 1.0 ml, (7), fig. 2-11
Deionized water, (8), fig. 2-11
d.
General Techniques Used: Refer to paragraphs cited below as required by procedure.
Planning the Test, para 2.6.1.1
Cleaning Glassware, para 2.6.1.2
Handling and Storing Reagents, para 2.6.1.3
Collecting Water Samples, para 2.6.1.4
Mixing, para 2.6.1.5
Using Pipets, para 2.6.1.7
Titrating, para 2.6.1.8
e.
Test Procedure:
(1)
Make sure both graduated test tubes(6, fig. 2-11) are clean. Rinse both with about one ml of deionized
water(8). Use one of the tubes to collect about a half test tube of sample water.
(2)
Use the 1 ml dropping pipet(7) to transfer 2 ml (two dropping pipets full) of the sample water to the empty
graduated test tube.
WARNING
ZINC CONDITIONING REAGENT
Irritating to eyes, skin and respiratory tract. For test purposes only.
Ingestion can cause nausea, damage mucous membranes,
vomiting, pain and circulatory collapse. Do not allow contact with
skin or eyes. Do not breathe dust. In case of contact, flush eyes
with water for at least 15 minutes. Get immediate medical attention.
Wash skin with soap and water. In case of ingestion, get immediate
medical attention. In case of inhalation, remove victim to fresh air.
(3)
Add one level small spoonful(3) (marked 0.05 mg/l) of zinc conditioning reagent(5) to the test tube
containing 2 ml of sample water at this point.
2-41
