Hanna Instruments HI 83218 - Manual (Page 23)

23
• Remove the cuvette and add the content of one packet of
HI 93749-0 reagent. Replace the cap and shake vigorously
for about 10 seconds.
• 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 μμμμμg/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 LR