MOLYBDENUM
1200 COLORIMETER, 0-30 ppm
CODE 3676-01
QUANTITY CONTENTS CODE
60 mL *Mo Buffer *3997-H
2 x 30 mL *Molybdenum Oxidizing Reagent *6485-G
2.5 g *Molybdenum Indicator Powder *6486-S
1 Colorimeter Tubes 10 mL, w/cap, set of 6 0290-6
1 Spoon, 0.05g, plastic 0696
1 Pipets, 1.0 mL, plastic, w/cap 0372
1 Pipet, 1.0 mL 0354
1 Water Sample Collecting Bottle 0688
1 1200 Colorimeter for Molybdenum 26729
*WARNING: Reagents marked with an * are considered to be potential health hazards.
To view or print a Material Safety Data Sheet (MSDS) for these reagents go to
www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail, phone or fax.
To order individual reagents or test kit components, use the specifi ed code number.
NOTE: After use, return *MO Buffer (3997) to zipper top storage bag to reduce
exposure to corrosive reagent.
INTRODUCTION
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 an environmentally safe corrosion
inhibitor.
MOLYBDENUM PROCEDURE - Thioglycolate Method
Read the 1200 Colorimeter Manual before proceeding. Carefully wipe tubes dry
before inserting into the colorimeter chamber
MOLYBDENUM
12
Fill theWater Sample
Collecting Bottle
(0688) with sample
water. This will be
used to dispense
sample water for the
tests.
Rinse and fi ll a
colorimeter tube
(0290) to the
10mL line with
sample water.
34
Use the 1.0 mL pipet
(0372) to add1mLof
*Mo Buffer (3997).
Cap and mix.
Use the 1.0 mL pipet
(0354) to add 1mL
of *Molybdenum
Oxidizing Reagent
(6485). Cap and mix.
5
Wipe the tube dry.
7
Push the READ
button to turn the
meter on. Press
the ZERO button
and hold it for 2
seconds until is
displayed. Release
the button to take
a blank reading
(0.0 ppm).
6
8
Insert the tube into the
chamber, being sure
to align the index line
with the arrow
on themeter.
Close the lid.
This tube is the
sample blank.
Use the 0.05 spoon
(0696) to add 0.05g of
*Molybdenum Indicator
Powder (6486).
5
Cap and mix
until the powder
dissolves.
Solution will
turn yellow if
molybdenum is
present.
6
Wipe the tube dry.
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.
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.
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.
LaMOTTE COMPANY
Helping People Solve Analytical Challenges
®
PO Box 329 • Chestertown • Maryland • 21620 • USA
800-344-3100 • 410-778-3100 (Outside USA) • Fax 410-778-6394
Visit us on the web at www.lamotte.com
63676-01 7/14
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