MACHEREY-NAGEL NANOCOLOR Potassium 50 Tube test Instructions
- June 3, 2024
- MACHEREY-NAGEL
Table of Contents
MACHEREY-NAGEL NANOCOLOR Potassium 50 Tube test
Overview
The test is suitable for the photometric determination of K+. The test is suitable for surface water, ground and drinking water.
REF : 985045
Measuring range:
- 2-50 mg/L K+ (method 0451)
- 5-120 mg/100 g (method 0452)
- Number of tests: 20
- Wavelength for photometric determination: 690 nm
- Shelf life: 24 months
- Reaction time: 2 minutes
- Storage temperature: 15–25 °C
- Storage conditions: upright
Method
Photometric determination as potassium tetraphenylborate.
Interferences
The foreign materials shown here do not interfere with the test up to the indicated concentrations (in mg/L). The cumulative effect of different interfering ions has not been tested.
Data in mg/L:
- NH4-N: 200
The method can be applied for analyzing seawater.
Turbidity should be filtered out prior to the measurement
Reagents and accessories
Contents of reagents set:
- 20 test tubes R0
- 1 reagent R2
- 1 reagent R3
- 1 measuring spoon, black, 85 mm
Required devices:
- MACHEREY-NAGEL photometer
- Digital piston pipette 1–5 mL (REF 916909) with pipette tips (REF 916916)
- Digital piston pipette 100–1000 μL (REF 91677) with pipette tips (REF 91667)
Standards
- NANOCONTROL Multistandard Metals 2 (REF 925016)
Sampling and preparation
See DIN EN ISO 5667-3-A 21.
Adjust to pH 1–13 prior to analysis.
Quality control
The measurement of a blank value and a standard is recommended before every measuring series as quality control measure.
Quality data:
The following data were determined during production according to
ISO 8466-1 and DIN 38402-A51:
- Standard deviation of the method: ± 1 mg/L K+
- Coefficient of variation of the process: ± 3 %
- Confidence interval: ± 2 mg/L K+
- Number of LOTs: 6
Specified data for procedure:
Sensitivity (absorbance of 0.010 A corresponds to): ± 0.2 mg/L K+
LOT-specific certificates are available at www.mn-net.com.
Procedure
- Open test tube
- Add 200 μL R2
- Pipette 2 mL of sample into test tube
- Seal test tube and shake vigorously
- Wait 1 min
- Add 1 level measuring spoon of reagent R3
- Seal test tube and shake for 10 s
- Wait 2 min
- Clean outside of test tube
- Measure
Notes
When using other photometers, make sure measurements are possible in test
tubes (16 mm OD) and calibrate the method. Correction value e. g. for colored
or turbid samples possible (see photometer manual).
Information regarding safety can be found on the box’ label and in the safety
data sheet. You can download the SDS from
www.mn-net.com/SDS.
11/2020
www.mn‑net.com
- DE Tel.: +49 24 21 969-0 info@mn-net.com
- CH Tel.: +41 62 388 55 00 sales-ch@mn-net.com
- FR Tel.: +33 388 68 22 68 sales-fr@mn-net.com
- US Tel.: +1 484 821 0984 sales-us@mn-net.com
MACHEREY-NAGEL GmbH & Co. KG
Neumann-Neander-Str. 6–8
52355 Düren · Germany
www.mn‑net
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