Reflectoquant® Nickel Test, Catalog No. 16985/1
1. Method
Ni2+ ions react with
dimethylglyoxime to form a light red complex, the concentration of
which is determined reflectometrically.
2. Measuring Range and Number of Determinations
| Measuring Range1) |
Number of Determinations |
| 10 - 200 mg/l Ni2+ |
50 |
1) for measurement of concentrations
> 200 mg/l Ni2+ see section 6
3. Applications
Sample Material:
Wastewater
Electroplating baths
Cooling lubricants
4. Influence of Foreign Substances
This was checked - in the case of interfering
ions up to concentrations of 1,000mg/l - in solutions containing 100
and 0mg/l Ni2+. The concentrations of foreign substances
given in the table lie below the limit at which the determination is
interfered with:
Concentrations of Foreign Substances in mg/l
or %
| Ag+ |
1,000 |
Fe3+ |
1,000 |
EDTA |
100 |
| Al3+ |
1,000 |
K+ |
1,000 |
Anionic Surfactants1) |
1,000 |
| Ascorbate |
1,000 |
Mg2+ |
1,000 |
Cationic Surfactants2) |
1,000 |
| BO33-+ |
1,000 |
Mn2+ |
1,000 |
Nonionic Surfactants3) |
100 |
| Br- |
1,000 |
NH4+ |
1,000 |
H2O2 |
1,000 |
| Ca2+ |
1,000 |
NO2- |
1,000 |
NaCl |
10% |
| Cd2+ |
1,000 |
NO3+ |
1,000 |
Na2SO4 |
10% |
| Citrate |
100 |
Oxalate |
100 |
|
|
| Cl- |
1,000 |
Pb2+ |
1,000 |
|
|
| CN- |
100 |
PO43- |
1,000 |
|
|
| CO32- |
1,000 |
S2O32- |
1,000 |
|
|
| CrO42- |
100 |
Tartrate |
1,000 |
|
|
| Cu2+ |
1,000 |
Zn2+ |
1,000 |
|
|
| Fe2+ |
1,000 |
|
|
|
|
1)tested with Na-dodecyl sulfate
2)tested with N-cetylpyridinium
chloride
3)tested with polyvinylpyrrolidone
5.Reagents and AuxiliariesThe analytic test strips are stable at
least up to the date stated on the pack when stored in the closed
tube at +15 to +25°C.
Package Contents:
Tube containing 50 analytical test strips
Bar code strip
Other Reagents:
EM Quant® Nickel Test, Cat. No. 10006, measuring range 10-500 mg/l Ni2+
colorpHast® Universal indicator strips pH 0-14, Cat. No.
9590
Sodium acetate GR Cat. No. SX0255
Titristar® Sulfuric acid .5 mol/l Cat. No. SX1243K
CertiPUR® Nickel standard solution ready for use, 1,000mg/l Ni2+, Cat. No. 1.19792
6. Preparation
- Check whether the nickel content is within
the measuring range
- Use the EM Quant® Nickel
Test as a guide. Samples containing more than 200 mg/l Ni2+
must be diluted with distilled water.
- The pH must be within the range 2-7.
Check with universal indicator strips. If pH is lower than 2, buffer
with sodium acetate; If greater than 7, add dilute sulfuric acid
dropwise.
7.Procedure
- Observe the instructions for the RQflex
Reflectometer.
The following applies to the Nickel Test:
Measurement Procedure A.
Stored reaction time: 30 sec.
- Remove 1 analytical test strip and immediately
reclose the tube.
- Press START button of the reflectometer and
at the same time immerse both reaction zones of the test
strip in the pretreated sample solution (5-30°C) for
approx. 2 sec.
- Vigorously shake off excess liquid from the
test strip.
- As soon as the beeper sounds (5 sec before
end of reaction time), insert the test strip all the way into the
strip adapter with the reaction zones facing the display.
- Read off the result from the display in mg/l
Ni2+. The result is automatically stored.
Note:
At the end of each workday, cleanse the strip
adapter thoroughly with water or ethanol.
8. Method Control
To check analytical test strips, equipment and
procedure:
Dilute nickel standard solution to 100 mg/l Ni2+
and analyze as described in section 7.
|
MSDS
(Material Safety Data Sheet)
