LaMotte COD Plus Colorimeter 1922-EX2 - Manual (Page 98)

NICKEL
DIMETHYLGLYOXIME METHOD • CODE 3663-SC
QUANTITY CONTENTS CODE
60 mL *Hydrochloric Acid, 2.5N
*6251PS-H
30 g *Ammonium Persulfate Reagent
*6566-G
30 mL *Silver Nitrate Solution, 0.0141N
*6346WT-G
250 mL Sodium Citrate, 10%
6253-K
60 mL *Dimethylglyoxime, 1%
*6254-H
60 mL *Ammonium Hydroxide, Conc.
*6537-H
3 Pipets, 1.0 mL, plastic
0354
1 Spoon, 0.1 g, plastic
0699
1 Test tube, 5-10-12.9-15-20-25,
glass, w/cap
0608
1 Graduated Cylinder, 10 mL, glass
0416
*WARNING: Reagents 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.
Nickel is not usually found in natural waters except as a result of
contamination from industrial wastewaters as a corrosion product of stainless
steel and nickel alloys. Nickel may also enter surface waters from plating bath
process water.
APPLICATION:
Drinking and surface waters; domestic and industrial
wastewater.
RANGE: 0.00 – 8.00 ppm Nickel
METHOD: Nickel under basic conditions forms a colored complex with
dimethylglyoxime in proportion to the concentration of
nickel.
SAMPLE
HANDLING &
PRESERVATION: Samples may be collected in either plastic or glass containers
and preserved by adding 5 mL of concentrated nitric acid per
liter.
INTERFERENCES: Organic matter interferes. Cobalt, iron, copper, manganese
and chromium do not interfere if each of the concentrations
is below 15 ppm.
COD PLUS TEST PROCEDURES 6/02 NICKEL 1/2