LaMotte COD Plus Colorimeter 1922-EX2 - Manual (Page 76)

COBALT
PAN METHOD
· CODE 4851
QUANTITY CONTENTS CODE
60 mL *Cobalt Buffer *4852-H
60 mL *Cobalt Indicator Reagent *4853-H
30 mL *Stabilizer Solution *4854-G
2 Pipet, 1.0 mL, plastic 0354
1 Pipet, 0.5 mL, plastic 0353
*WARNING: Reagent marked with a * are considered hazardous substances. Material
Safety Data Sheets (MSDS) are supplied for these reagents. For your safety read label
and accompanying MSDS before using.
Cobalt rarely occurs in natural water. It is used in the manufacture of alloys to
increase corrosion resistance and strength. It is found in wastewaters as a
corrosion by-product.
APPLICATION:
Industrial wastewater.
RANGE: 0.0 – 2.0 ppm cobalt
METHOD: PAN (1-(2-Pyridylazo)-2-Naphthol) forms a greenish
complex with Cobalt (Co
+2 ) at a pH of 5.
SAMPLE
HANDLING &
PRESERVATION: Store samples in acid-washed plastic bottles. Adjust pH to
less than 2 with nitric acid. Adjust sample pH to 5 before
testing.
INTERFERENCES: Iron (+2) and high concentrations of heavy metals.
COD PLUS TEST PROCEDURES 2/04 COBALT 1/2