LaMotte SMART Spectro Spectrophotometer - Manual (Page 112)

CHROMIUM-HEXAVALENT,
TRIVALENT & TOTAL
DIPHENYLCARBOHYDRAZIDE METHOD
CODE 3698-SC
QUANTITY CONTENTS CODE
60 mL *Sulfuric Acid, 5N *7681-H
10 g *Chromium Reagent Powder *V-6276-D
15 mL *Sodium Azide, 5% *7683-E
30 mL Potassium Permanganate, 0.5% 7682-G
60 mL Deionized Water 5115PT-H
1 Pipet, plain, glass, w/cap 0341
1 Pipet, 1.0 mL, plastic 0354
1 Spoon, 0.1 g, plastic 0699
1 Graduated Cylinder, 50 mL, glass 0418
1 Erlenmeyer Flask, 125 mL, glass 0431
1 Test tube holder 1113
1 Filter Paper 0465
1 Funnel, Plastic 0459
*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.
A toxic chemical, chromium is found in two forms in the water; trivalent chromium
(Cr 3+ ) and hexavalent chromium (Cr 6+ ). Chromium enters the water from industrial
waste. Hexavalent chromium is more toxic than trivalent chromium. Levels greater
than 0.5 ppm indicate improperly treated industrial waste. It is important to maintain
chromium levels at or below 0.5 ppm, because clams and other shellfi sh will store
chromium in their systems, accumulating levels which may be dangerous to the
consumer, whether human or animal.
SMART Spectro Test Procedures 2.11 CHROMIUM-Hexavalent, Trivalent & Total
Test P
rocedures