LaMotte DC1600 Colorimeter - Manual (Page 57)

NICKEL
DIMETHYLGLYOXIME METHOD CODE 3663
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, measuring, glass, w/cap 0786
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 – 10.0 ppm Nickel
METHOD: Nickel under acidic 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.
This test procedure is designed for determining nickel in effluents where organic matter is absent and the interfering ions of
cobalt, iron, copper, manganese and chromium are below 15 ppm.
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