LaMotte SMART Spectro Spectrophotometer - Manual (Page 166)

MOLYBDENUM
THIOGLYCOLATE METHOD • CODE 3699-02-SC
QUANTITY CONTENTS CODE
2 x 30 mL * Mo Buffer *3997-G
2 x 30 mL * Molybdenum Oxidizing Reagent *6485-G
2.5g * Molybdenum Indicator Powder *6486-S
1 Spoon, 0.05g, plastic 0696
2 Pipets, 1.0 mL, plastic w/cap 0372
*WARNING: Reagents marked with a * are considered to be potential health hazards. To view
or print a Material Safety Data Sheet (MSDS) for these reagents see MSDS CD or
www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail, phone or fax.
Molybdenum occurs naturally in the earth’s crust as molybdenite and
wolfenite, and is an important element in many biochemical reactions,
including nitrogen fixation. In industrial processes, such as the operation of
boilers and cooling towers, molybdenum, in the form of sodium molybdate, is
used as a corrosion inhibitor.
APPLICATIONS: Boiler and cooling waters.
RANGE: 0.0–15.0 ppm Molybdenum
METHOD: Calcium thioglycolate reacts with molybdenum to give a
yellow color with an intensity proportional to the amount of
molybdenum present.
SAMPLE
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. Samples with high levels of
nitrite will eventually develop a pale orange color. Scan the
sample immediately to avoid this interference.
SMART SPECTRO TEST PROCEDURES 01.06 Molybdenum 1/2