LaMotte MOLYBDENUM 1200 COLORIMETER - Manual (Page 3)

Cap and mix
until the powder
dissolves.
Solution will
turn yellow if
molybdenum is
present.
Wipe the tube dry.
Align the index
line with the
arrow on the
meter, insert tube
into chamber.
Close the lid. Push
the button. Record
results as ppm
Molybdenum.
NOTE: If the molybdenum reading
exceeds 50 ppm, repeat procedure
on diluted sample, and multiply the
result by the appropriate dilution
factor. See 1200 Colorimeter
Instruction Manual for procedure.
5 6
7
MOLYBDENUM TEST METHOD SPECIFICATIONS
APPLICATION
Boiler and cooling water
RANGE
0 to 30 ppm Molybdenum
METHOD
Calcium thioglycolate reacts with molybdenum to give a yellow color with an
intensity proportional to the amount of molybdenum present.
HANDLING & PRESERVATION
Molybdenum samples may be stored in either plastic or glass containers.
INTERFERENCES
Nickel levels less than 50 ppm do not interfere; aluminum levels less than 10 ppm do
not interfere; chromate, at higher concentrations, interferes due to the intense yellow
color. Ferrous iron levels below 50 ppm do not interfere, but low levels of ferric iron
will cause a large blank. Highly buffered samples may exceed the capacity of the
system possibly producing inaccurate results. Add an extra 1.0 mL of *Mo Buffer
(3997) to adjust the pH of the sample to approximately 4.5. Multiply the result in ppm
by 1.08.