Hach DR2400 - Page 107

Barium
Barium
Barium_AVPP_Other_TUR_Eng_Ody.fm Page 5 of 6
Method Performance
Standard: 30 mg/L Ba
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Sensitivity
See Section 3.4.5 Sensitivity on page 44 for more information.
Calibration Standard Preparation
Prepare calibration standard containing 10, 20, 30, 50, 80, 90, and 100 mg/L Ba
as follows:
1. Into seven different 100-mL Class A volumetric flasks, pipet 1, 2, 3, 5, 8, 9 and
10 mL of the 1000-mg/L Barium Standard Solution using Class A glassware.
2. Dilute to the mark with deionized water. Mix thoroughly.
3. Using the turbidimetric method and the calibration procedure described in
the User-Entered Programs section of the instrument manual, generate a
calibration curve from the standards prepared above.
Summary of Method
The BariVer® 4 Barium Reagent Powder combines with barium to form a barium
sulfate precipitate, which is held in suspension by a protective colloid. The
amount of turbidity present caused by the fine white dispersion of particles is
directly proportional to the amount of barium present. Test results are measured
at 450 nm.
Required Reagents
Quantity Required
Description per test Unit Cat. No.
BariVer
®
4 Barium Reagent Powder Pillows .................................1 pillow........... 100/pkg.............12064-99
or BariVer
®
4 Barium Reagent AccuVac
®
Ampuls.............................1 ampul........... 25/pkg...............25130-25
Required Apparatus
Sample Cells, 10-20-25 mL, w/cap.........................................................2....................... 6/pkg.................24019-06
Beaker, 50-mL............................................................................................1 ....................... each.................... 500-41H
Required Standards
Barium Standard Solution, 1000-mg/L Ba...................................................................... 100 mL...............14611-42
Water, deionized ................................................................................................................. 4 liters ....................272-56
Program 95% Confidence Limits of Distribution
20 25–35 mg/L Ba
25 25–35 mg/L Ba
Program Portion of Curve ∆Abs ∆Concentration
20 Entire Range 0.010 1 mg/L Ba
25 Entire Range 0.010 1 mg/L Ba