TM 10-6630-245-13&P
(4)
Take the tube with 2 ml of sample. Fill it up to the mark etched on the tube with deionized water(8).
WARNING
ZINC REAGENT
Irritating to eyes, skin and mucous membranes. Chronic effects:
carcinogen. For test purposes only. Do not ingest or 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.
(5)
Use the large measuring spoon(4) (marked 0.5g). Add one level spoonful of the zinc reagent(2).
NOTE
Do not shake tube longer than 15 seconds.
(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/I.
(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 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 color of the test sample most closely matches the 10 ppm color or if it is black or a darker color than
found in the comparator, perform the High Range Zinc Test in para 2.6.8.9.
2.6.8.11. Fluoride Test. SPADNS Method.
a.
Purpose of Test: To determine the amount of fluorides dissolved in water.
b.
Range: O to 2.0 mg/l
c.
Equipment Used: Found in Main Carrying Case para 1.8, fig. 1-1
Volumetric Pipet, 5 ml, (4), fig. 1-1
Fluoride standard solution, (15), fig. 1-1
Fluoride solution, SPADNS, (16), fig. 1-1
Spectrophotometer, (20), fig. 1-1
Pipet filler, (27), fig. 1-1
Volumetric flask, 25 ml, (32), fig. 1-1
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
Spectrophotometer, para 2.6.2.2
2-42
