Hanna Instruments HI 83206-2008 - Manual (Page 21)

40 41 Molybdenum
• Press TIMER and the display will show the countdown prior to the measurement or, alternatively, wait
for 5 minutes and press READ. When the timer ends the meter will perform the reading. The instrument
displays concentration in mg/L of molybdenum.
• Press the or to access the second level of functions.
• Press the Chem Frm functional key to convert the result in mg/L of molybdate (MoO
4
) and sodium
molybdate (Na
2
MoO
4
).
• Press the or to go back to the measurement screen.
INTERFERENCES
Interference may be caused by:
Aluminum above 50 mg/L
Chromium above 1000 mg/L
Copper above 10 mg/L
Iron above 50 mg/L
Nickel above 50 mg/L
Nitrite, as NO
2
–
Sulfate above 200 mg/L
Highly buffered samples or with extreme pH may exceed the buffering capacity of the reagents.
• Fill one graduated mixing cylinder up to the 25 mL
mark with the sample.
• Add the content of one packet of HI 93730A-0
molybdenum reagent, close the cylinder and invert it
several times until completely dissolved.
• Add the content of one packet of HI 93730B-0
molybdenum reagent to the cylinder, close and invert
it several times until completely dissolved.
• Add the content of one packet of HI 93730C-0
molybdenum reagent to the cylinder, close and shake
it vigorously.
• Fill an empty cuvette with 10 mL of sample up to the
mark and replace the cap.
• Insert the cuvette into the instrument.
Molybdenum