Test Procedures
PHOSPHATE–HIGH RANGE
VANADOMOLYBDOPHOSPHORIC ACID METHOD • CODE 3655-SC
QUANTITY
CONTENTS
CODE
4 x 30 mL
* VM Phosphate Reagent
*4410-G
1
Pipet, 1.0 mL, plastic
0354
*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).
Phosphate treatments in boiler and cooling water and other industrial water systems are
run at levels up to 100 ppm orthophosphate. These high levels permit the use of a simpler,
high range test.
APPLICATION:
Boiler, cooling, and industrial waters.
RANGE:
0.0–70.0 ppm Phosphate
MDL:
1.0 ppm
METHOD:
Orthophosphate reacts in acid conditions with ammonium
vanadomolybdate to form vanadomolybdophosphoric acid.
This yellow color is proportional to the concentration of
orthophosphate and is read colorimetrically.
SAMPLE HANDLING &
PRESERVATION:
If the analysis cannot be performed the same day of
collection, the sample should be preserved by the addition of
2 mL of concentrated sulfuric acid or 40 mg mercuric chloride
per liter and refrigerated at 4°C.
INTERFERENCES:
Silica interferes only if the sample is heated. Arsenate,
fl uoride, thorium, bismuth, sulfi de, thiosulfate, and
thiocyanate cause negative interference.
SMART Spectro 2 Test Procedures 05.02.16
PHOSPHATE
, HIGH RANGE
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