Hach DR2400 - Page 701

Selenium
Selenium
Selenium_None_Other_DAB_Eng_Ody.fm Page 3 of 8
13. Touch the timer icon.
Touch
OK.
A 30-second reaction
period will begin. During
this time, vigorously
shake the funnel that
contains the sample.
14. Touch the timer icon.
Touch
OK.
A four-minute reaction
period will begin.
15. When the timer
beeps, drain the lower
water layer from each
funnel and discard.
Complete steps 16–20
within five minutes after
the timer beeps. The
developed color is stable,
but should be measured as
soon as possible.
16. Insert a cotton plug
into the delivery tube of
each separatory funnel.
Slowly drain the toluene
into respective sample
cells labeled “blank” and
“sample”. Fill to the
10 mL line and cap the
sample cells.
Note: Filtering the toluene
through dry, absorbent cotton
will remove water or suspended
particles.
17. Wipe the blank and
place it into the cell
holder.
18. Touch Zero.
The display will show:
0.00 mg/L Se
19. Wipe the prepared
sample and place it into
the cell holder.
20. Touch Read.
Results will appear in
mg/L Se.
S
10 mL
Zero
10 mL
Read