LaMotte SMART Spectro Spectrophotometer - Manual (Page 116)

CHROMIUM, TESTAB
DIPHENYLCARBOHYDRAZIDE TESTAB METHOD
CODE 3697-SC
QUANTITY CONTENTS CODE
50 *Chromium Spectrophotometric Grade Tablets *3889A-H
1 Tablet Crusher 0175
*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.
Chromium is one of a class of heavy metals found in the bottom mud of polluted
bodies of water. It is considered to be a toxic chemical. Chromium will become
concentrated in some shellfi sh, endangering the health of the human or animal
that consumes them. Chromium may be present in water containing waste from
industries such as metal plating. If more than 0.5 ppm chromium is present, it is
evidence of contamination from untreated or incompletely treated industrial waste.
APPLICATION: Drinking, surface, and saline waters; domestic and
industrial wastewaters.
RANGE: 0.00–1.00 ppm Chromium
MDL: 0.03 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. Storage in plastic or glass containers
may result in low results.
INTERFERENCES: High concentrations of mercurous and mercuric
ions may impart a blue color to the chromium
determination. Iron and vanadium in concentrations
above 1 ppm may result in a yellow color.
SMART Spectro Test Procedures 2.11 CHROMIUM, TesTab
Test P
rocedures