Hach DR/700 - Page 561

61-5
BORON, continued
STATISTICAL EVALUATION
A single operator repetitively tested samples of two laboratory prepared
solutions, using one DR/700, matched sample cells and two
representative lots of reagent. Testing 8.0 mg/L B concentration
solutions, the standard deviation was ±0.11 mg/L B.
Testing zero concentration samples, the limit of detection was
0.44 mg/L B. The limit of detection was calculated as three times the
standard deviation when testing zero concentration samples (adapted
from Analytical Chemistry, 1980, 52, 2242-2249).
SUMMARY OF METHOD
Boron is determined by its reaction with carminic acid in the presence of
sulfuric acid to produce a reddish to bluish color. The amount of color is
directly proportional to the boron concentration.
REQUIRED REAGENTS
Quantity
Description Per Test Unit Cat. No.
BoroVer 3 Boron Reagent
Powder Pillows. . . . . . . . . . 1 pillow . . .50/pkg . . . . . . . . 14170-66
Sulfuric Acid, ACS . . . . . . . . . 75 mL . . . . .4 Kg. . . . . . . . . . . . 979-09
Water, demineralized. . . . . . . . 2.0 mL. . . . . 4 L . . . . . . . . . . . . . 272-56
REQUIRED APPARATUS
Clippers, for opening
powder pillows . . . . . . . . . . 1 . . . . . . . . .each . . . . . . . . . . . . 968-00
Cylinder, graduated, 50 mL. . . 1 . . . . . . . . .each . . . . . . . . . . . . 508-41
Cylinder, graduated, 100 mL. . .1 . . . . . . . . . .each . . . . . . . . . . . . .508-42
DR/700 Filter Module
Number 61.01. . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46261-00
Flask, erlenmeyer, 125 mL . . . 2 . . . . . . . . .each . . . . . . . . . . . . 505-43
Flask, erlenmeyer, 250 mL . . . 1 . . . . . . . . .each . . . . . . . . . . . . 505-46
Pipet, volumetric, 2.00 mL . . . 2 . . . . . . . . . each . . . . . . . . . . 14515-36
OPTIONAL REAGENTS
Boron Standard Solution, 4 mg/L as B . . . . .500 mL . . . . . . . . 1963-49
Boron Standard Solution,
Voluette ampule, 250 mg/L B, 10 mL . . .16/pkg . . . . . . . . 14249-10