Test Procedures
MOLYBDENUM
THIOGLYCOLATE METHOD • CODE 3699-03-SC
QUANTITY
CONTENTS
CODE
2 x 30 mL
* Mo Buff er
*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 an * are considered to be potential health hazards. To
view or print a Safety Data Sheet (SDS) for these reagents go to www.lamotte.com.
Search for the four digit reagent code number listed on the reagent label, in the contents
list or in the test procedures. Omit any letter that follows or precedes the four digit code
number. For example, if the code is 4450WT-H, search 4450. To obtain a printed copy,
contact LaMotte by email, phone or fax.
Emergency information for all LaMotte reagents is available from Chem-Tel:
(US, 1-800-255-3924) (International, call collect, 813-248-0585).
Molybdenum occurs naturally in the earth’s crust as molybdenite and wolfenite, and is an
important element in many biochemical reactions, including nitrogen fi xation. 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.
APPLICATION:
Boiler and cooling waters.
RANGE:
0.0–15.0 ppm Molybdenum
MDL:
0.2 ppm
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 buff ered
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 2 Test Procedures 05.02.16
MOLYBDENUM
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