Hanna Instruments HI 83208-2008 - Manual (Page 23)

44 45 Molybdenum
• Press TIMER and the display will show the countdown prior to the measurement or, alternatively, wait
for five 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
2- ) 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