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Idiomas disponibles
Idiomas disponibles
NANOCOLOR
COD 160
®
Overview
The test is suitable for the photometric determination of the chemi-
cal oxygen demand (COD). The test is in accordance with DIN ISO
15705–H45 and is equivalent to EPA Standard Method 5220 D.
This test is suitable for water, wastewater and sludge.
• Measuring range: 15–160 mg/L O
(method 0261)
2
• Number of tests: 20
• Wavelength for photometric determination: 436 / 450 nm
• Shelf life: 12 months
• Reaction time: 120 minutes
• Storage temperature: 15–25 °C
• Storage conditions: protected from sunlight, upright.
Method
The organic compounds of a sample are oxidized by heating the
sample in a mixture of sulphuric acid and potassium dichromate.
The chemical oxygen demand (COD) of a water sample is the con-
centration of oxygen that is equivalent to the amount of potassium
dichromate consumed. The change in the potassium dichromate
concentration is determined via the change in absorbance after
digestion.
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:
• Cl
-
: 1500
Important: For samples in which the chloride content is high, shake
the tube to suspend the precipitate prior to adding the sample. If
the chloride content is greater than 1500 mg/L, you must dilute
the sample or use a chloride masking agent (REF 918911). Once it
has reacted in the heating block, the solution must not be cloudy;
Fig. 9: Test kit instructions
turbidity can result in high COD values.
The use of precipitated mercury sulphate will allow the turbidity to
settle.
This method is not suitable for analyzing seawater.
Turbidity leads to lower measured values.
Reagents and accessories
Step 4: Perform measurement
Contents of reagents set:
• 20 test tubes R0
Required devices:
• MACHEREY-NAGEL photometer
• MACHEREY-NAGEL heating block
• Digital piston pipette 1–5 mL (REF 916909) with pipette tips
(REF 916916)
• Safety bottle for shaking COD tubes (REF 91637)
Standards
• NANOCONTROL COD 160 (REF 92526)
Unclean cuvettes can contaminate the cuvette shaft and lead to incorrect measurement
• NANOCONTROL Multistandard Sewage outflow 1 (REF 925011)
Sampling and preparation
See DIN EN ISO 5667-3-A 21 and DIN 38409–H41-1.
results.
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All measurements can be started from the methods menu (Fig. 10).
MACHEREY-NAGEL GmbH & Co. KG
MACHEREY-NAGEL GmbH & Co. KG
DE Tel.: +49 24 21 969-0
DE Tel.: +49 24 21 969-0
Neumann-Neander-Str. 6–8
Neumann-Neander-Str. 6–8
CH Tel.: +41 62 388 55 00 sales-ch@mn-net.com
CH Tel.: +41 62 388 55 00 sales-ch@mn-net.com
52355 Düren · Germany
52355 Düren · Deutschland
FR
Tel.: +33 388 68 22 68 sales-fr@mn-net.com
FR
Tel.: +33 388 68 22 68 sales-fr@mn-net.com
US Tel.: +1 484 821 0984
US Tel.: +1 484 821 0984
UV/VIS II
Methods
Basis Functions
MN Tests
Special Methods
1
2
3
4
5
6
7
8
9
Test Number
Fig. 10: Method
Absorbance measurement
The basic function absorbance offers the option of determining the absorbance of a sample
solution as compared to a zero solution. After the method is called up, a window to enter the
wavelengths at which the measurement is to be performed appears. The wavelengths are
entered in a list by pressing the
to the list. The selected entry is removed by pressing the
deletes all of the list contents.
Quickstart Guide NANOCOLOR
REF: 985026
en
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:
• Number of LOTs: 75
• Standard deviation of the method: ± 1.06 mg/L O
2
• Coefficient of variation of the process: ± 1.28 %
• Confidence interval: ± 2.44 mg/L O
2
Specified data for procedure:
• Sensitivity (absorbance of 0.010 A corresponds to): 2.18 mg/L
O
2
• Accuracy of a measurement value: ± 8.40 mg/L O
2
LOT-specific certificates are available at www.mn‑net.com.
Procedure
1. Open round cell and hold slightly tilted
2. Pipette 2 mL of sample into test tube
3. Seal test tube and shake vigorously (use safety bottle, cuvette
will become hot!).
4. Heat for 2 h at 148 °C or for 30 min at 160 °C
5. Take the tube from the heating block
6. Shake again after 10 min. while still warm
7. Cool to room temperature
8. Clean outside of test tube
9. Measure
Notes
Test a sample of COD-free water (REF 918993) to generate a blank
value for the reagent.
When using a standard, the measured value is constant over a
period of min. 30 min.
Correction value e. g. for colored or turbid samples possible (see
photometer manual).
When using other photometers, make sure measurements are
possible in test tubes (16 mm OD) and calibrate the method.
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.
10/2020
info@mn-net.com
info@mn-net.com
sales-us@mn-net.com
sales-us@mn-net.com
Open Mode, 01.03.2016, 10:57
Scan
Color
Add
Perform the test according to the instructions
of the respective test kit (Fig. 9). Read these
instructions carefully in order to obtain precise
and reliable results. Prepare the specimen
according to the instructions.
NOTICE
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button. A maximum of 10 wavelengths can be added
/
II / VIS II V 2.00/09‑2022
® UV
VIS
button. Pressing
Remove
Clear
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