43
• Reinsert the cuvette into the instrument.
• Press
Timer
and the display will show the countdown prior to the measurement or, alternatively, wait
for 6 minutes and press
Read
. When the timer ends the meter will perform the reading. The
instrument displays concentration in
μμμμμ
g/L of chromium VI
.
• Press
or
to access the second level functions.
• Press the
Chem Frm
key to convert the result in
μ
g/L of Chromate (CrO
4
2
¯) and Dichromate (Cr
2
O
7
2
¯).
• Press
or
to return to the measurement screen.
INTERFERENCES
Interference may be caused by:
Vanadium above 1 ppm. However, waiting 10 minutes before reading, the interference is removed
Iron above 1 ppm
Mercurous and mercuric ions cause slight inhibition of the reaction.
Chromium VI HR