17.
Start the instrument
timer. A 15-minute reaction
time starts.
18.
When the timer expires,
set the heater power to off.
Remove the cylinder/gas
bubbler assembly as a unit.
19.
Move the gas bubbler
up and down in the arsenic
absorber solution to rinse
the bubbler.
20.
Prepare the blank:
Fill
a dry 10-mL sample cell with
unreacted arsenic absorber
solution. Put the stopper on
the sample cell.
21.
Clean the blank sample
cell.
22.
Insert the blank into the
cell holder.
Zero
23.
Push
ZERO
. The
display shows the (non-
zero) intercept that is
calculated from the user-
entered calibration curve.
24.
Prepare the sample:
Pour the reacted arsenic
absorber sample into a
sample cell. Put the stopper
on the sample cell.
25.
Clean the prepared
sample cell.
26.
Insert the prepared
sample into the cell holder.
Read
27.
Push
READ
. Results
show in mg/L As.
Interferences
Interfering substance
Interference level
Antimony Salts
Can interfere with color development.
4
Arsenic Silver Diethyldithiocarbamate Method (0.200 mg/L)
