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
μμ
μμ
μg/L of chromium VI.
• Press or to access the second level functions.
• Press the Chem Frm key to convert the result in μg/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
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