LaMotte ZINC TEST KIT ZN - Manual (Page 2)

PRO CE DURE
1. Use the 1.0 mL pipet (0354) to add 2 mL of sample water to a 5 mL test tube
(0230).
2. Use water from the Demineralizer Bottle (1151) to fill test tube to the 5 mL
line. Cap and mix.
3. Add 5 drops of *Zinc Conditioning Reagent (7361). Cap and mix. Wait one
minute. This reagent will eliminate copper interference and adjust the pH of
the sample water to pH 9. In water samples where the pH is very low, adjust
the pH of the sample to approximately 9 before adding the *Zinc
Conditioning Reagent (7361).
4. Use the 0.5g spoon (0698) to add one level scoop of *Zinc Reagent Powder
(7393). Cap and shake for 15 seconds. Do not shake for longer than 15
seconds, even if some powder remains undissolved. Wait one minute.
5. Insert test tube into Zinc Comparator (7392). Match sample color with a
color standard. Record as ppm Zinc. If reading is darker than 10 ppm standard
see procedure for High Range Readings.
NOTE:
Slight variations in the amount of *Zinc Reagent Powder (7393)
added in Step 4 may cause the intensity, but not the shade, of the color
reaction to vary. Since each color standard exhibits a distinct shade of color,
this should not hinder the ability to get an accurate reading.
HIGHER RANGE READ INGS (0-20.0 ppm)
If reading is darker than the 10 ppm color standard repeat test on a diluted sample.
1. Use the 1.0 mL pipet (0354) to add 1 mL of sample water to a 5 mL test tube
(0230).
2. Follow Steps 2 through 5 above. Multiply reading by 2. Record as ppm Zinc.
LOWER RANGE READ INGS (0-4.0 ppm)
For more precise measurements between 0 and 4 ppm.
1.
Fill test tube (0230) to 5 mL line with sample water.
2. Fol low Steps 3 through 5 above. Mul ti ply read ing by 0.4. Re cord re sults as
ppm Zinc.
LaMOTTE COM PANY
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PO Box 329 • Chestertown • Mary land • 21620 • USA
800-344-3100 • 410-778-3100 (Out side U.S.A.) • Fax: 410-778-639
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