75
CHROMIUM (VI) LOW RANGE
• Reinsert the cuvette into the instrument and close the lid.
• 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 µg/L of chromium (Cr
6+
).
• Press or to access the second level functions.
• Press the Chem Frm key to convert the result to 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 removes the interference. Iron above 1 ppm. Mercurous and mercuric ions cause slight
inhibition of the reaction.
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