Hanna Instruments HI 83208-2008 - Manual (Page 33)

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INTERFERENCES
Interference may be caused by:
Phosphate above 60 mg/L
Phosphate above 75 mg/L
Sulfide and high concentration of iron
Eliminate color and turbidity interferences by zeroing the meter with the original water sample.
Silica Silica
• Place the cuvette into the holder and close the lid.
• Press ZERO key. The display will show “-0.0-” when the
meter is zeroed and ready for measurement.
• Remove the cuvette and add the content of one packet
of HI 93705C-0 Amino acid reagent and shake until it is
completely dissolved.
• Reinsert the cuvette into the instrument.
• Press TIMER and the display will show the countdown
prior to the measurement. Alternatively, wait for exactly 3
minutes and press READ. When the timer ends the meter
will perform the reading. The instrument displays
concentration in mg/L of silica (SiO
2
).
• Press the or to access the second level of functions.
• Press the Chem Frm functional key to convert the result in mg/L of Silicon (Si).
• Press the or to go back to the measurement screen.