Hach DR/700 Procedures Manual page 181

BARIUM,
continued
INTERFERENCES
The following may interfere when present in concentrations exceeding
those listed below:
Silica
Sodium Chloride
Magnesium
Calcium
Strontium
If strontium is known to be present, the total concentration between
barium and strontium may be expressed as a PS (Precipitated by
Sulfate). While this does not distinguish between barium and strontium,
it gives an accurate indication of scaling tendency.
Highly buffered samples or extreme sample pH may exceed the
buffering capacity of the reagents and require sample pretreatment; see
Interferences, pH (Section I).
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.
REQUIRED REAGENTS (Using Powder Pillows)
Description
BariVer 4 Barium Reagent
Powder Pillows. . . . . . . . . . 2 pillows . . . 50/pkg . . . . . . . . 12064-66
Barium Standard Solution,
5000 mg/L, Voluette
ampule, 10 mL . . . . . . . . . . varies . . . . . . 16/pkg . . . . . . . . 14251-10
Water, demineralized . . . . . . . . 500 mL . . . . 4 L . . . . . . . . . . . . . 272-56
REQUIRED APPARATUS (Using Powder Pillows)
Clippers, for opening
powder pillows . . . . . . . . . . 1 . . . . . . . . each . . . . . . . . . . . . 968-00
DR/700 Filter Module
Number 45.01. . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46245-00
500 mg/L
130,000 mg/L as NaCl
100,000 mg/L as CaCO
10,000 mg/L as CaCO
Interferes at any level
Quantity
Per Test Unit
45-9
3
3
Cat. No.