Taylor K-8000, User Manual, Page: 23 / 100

2-5 TTi
®
Colorimeter User’s Manual
Part 2 Testing Primer
Illustration of above RANGE alert signaling dilution is necessary
Start with a small dilution and continue to increase the dilution as necessary to bring the concentration of the
analyte into the range of the test. ( NOTE: Sample dilution should not be performed when testing pH or after
reagent addition, only before reagent addition.) The following table can be used as a guide.
Sample High-Purity Water Multiplication Factor
Add this volume of
sample to the dilution vial Add this volume of high-purity water to the
dilution vial, cap, and mix thoroughly. Retest this
diluted sample according to the test instructions. If the test result is now within the range of the test, mul-
tiply the result by the multiplication factor listed below to
determine the concentration of the analyte in the undiluted
sample. If the test result is still above RANGE, increase the
dilution and retest.
33 mL 17 mL 1.5
25 mL 25 mL 2
10 mL 40 mL 5
5 mL 45 mL 10
2 mL 48 mL 25
PRETREATING SAMPLES
Some samples may require digestion in order to test for total metals. To perform a digestion, first
reduce the sample volume by gently heating and then refluxing to ensure all organometallic bonds
have been broken. Allow the sample to cool and then dilute to a specified volume with deionized
water. Sample digestion will require the following materials:
• ASTM Type I water
• Beaker, 250 mL
• Graduated cylinder, 100 mL
• Hotplate or steam bath
• Hydrochloric acid (high-purity grade)
• Hydrochloric acid solution 1:1
Add 50 mL hydrochloric acid (high-purity grade) to 40 mL ASTM Type I water. Dilute to 100 mL with
ASTM Type I water.
• Nitric acid (high-purity grade)
• Nitric acid solution 1:1
Add 50 mL nitric acid (high-purity grade) to 40 mL ASTM Type I water. Dilute to 100 mL with
ASTM Type I water.
• Ribbed watch glass, 75 mm
• Volumetric flask, 100 mL
• Watch glass, 75 mm