Hach DR2400 Manual page 114

Boron
5.
Accurately pipet
2.0 mL of sample into
another 125-mL
Erlenmeyer flask
(the prepared sample).
25 mL
20 mL
10 mL
9.
Place the blank into
the cell holder.
Sample Collection, Preservation, and Storage
Reagent Preparation
Boron
Page 2 of 4
6.
Using a 50-mL
graduated cylinder, add
35 mL of the solution
prepared in step 3 to each
Erlenmeyer flask. Swirl
to mix completely.
Zero
10.
Touch .
Zero
The display will show:
0.0 mg/L B
Collect samples in clean polyethylene or polypropylene bottles, or
alkali-resistant, boron-free glass.
To prepare additional BoroVer 3/Sulfuric Acid Solution, mix one BoroVer 3
Reagent Powder Pillow per 75 mL of concentrated sulfuric acid, adding the
powder pillows individually while stirring. Preparation of this solution
generates gaseous HCl when the indicator pillow is added to the sulfuric acid.
Use of a fume hood or other well-ventilated lab area is strongly advised. This
solution is stable for up to 48 hours if stored in plastic containers. Do not store in
® ®
Pyrex or Kimex glassware for longer than one hour; the solution may leach
boron from these containers.
7.
Touch the timer icon.
Touch .
OK
A 25-minute reaction
period will begin.
25 mL
20 mL
10 mL
11.
Place the prepared
sample into the cell
holder.
25 mL 25 mL
20 mL 20 mL
10 mL 10 mL
8.
When the timer
beeps, pour at least
10 mL from each flask
into separate round
sample cells. Cap the
cells.
Read
12.
Touch .
Read
Results will appear in
mg/L B.
Boron_PP_Other_CAR_Eng_Ody.fm