Test Procedures
CHROMIUM, HEXAVALENT
DIPHENYLCARBOHYDRAZIDE METHOD • CODE 3645-SC
QUANTITY
CONTENTS
CODE
10 g
*Chromium Reagent Powder
*V-6276-D
1
Spoon, 0.1 g, plastic
0699
50
Filter Paper
0465-H
1
Funnel, Plastic
0459
*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).
Chromium may be present in water containing waste from industries such as metal
plating. It is considered to be a toxic chemical and, if present in an amount of over 0.5 ppm,
is evidence of contamination from untreated or incompletely treated industrial waste.
Chromium is one of a class of heavy metals found in the bottom mud of polluted bodies of
water. Certain shellfi sh are capable of concentrating this element, endangering the health
of its ultimate consumer, human or animal.
APPLICATION:
Drinking, surface, and saline waters; domestic and industrial
wastewaters.
RANGE:
0.00–1.00 ppm Chromium
MDL:
0.01 ppm
METHOD:
Hexavalent chromium reacts with 1,5
diphenylcarbohydrazide under acidic conditions to form a
red-purple color in proportion to the amount of chromium
present.
SAMPLE HANDLING &
PRESERVATION:
Analysis for chromium should be made as quickly as possible
after sample collection since storage in glass or plastic
containers may result in low chromate values.
INTERFERENCES:
High concentrations of mercurous and mercuric ions may
impart a blue color to the chromium determination. Iron and
vanadium in concentrations above 1 mg/L may result in a
yellow color. However, the vanadium color becomes negligible
10 minutes after the addition of diphenylcarbohydrazide.
SMART Spectro 2 Test Procedures 05.02.16
CHROMIUM,
HEXAVALENT
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