Where can I find information on how to determine COD using the LCK Test Vials?

Dokument-ID

Dokument-ID TE10431

Veröffentlichungsdatum

Veröffentlichungsdatum 01.09.2020
Frage
Where can I find information on how to determine COD using the LCK Test Vials?
Zusammenfassung
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Antwort
Measuring principle:(for LCK714, LCK514, LCK114, LCK014, LCK914, LCK1014)
Oxidisable substances react with sulphuric potassium dichromate solutions as a catalyst in the presence of silver sulphate. Chloride is masked with mercury sulphate. The green colour of the Cr3+ is evaluated.
Measuring principle:(for LCK1414, LCK314, LCK614, LCK1814)
Oxidisable substances react with sulphuric potassium dichromate solutions as a catalyst in the presence of silver sulphate. Chloride is masked with mercury sulphate. The decrease in the yellow colour of the Cr6+ is evaluated.

Application:
Water, waste water, process analysis
Measurement ranges:
LCK1414:   5 - 60 mg/L O2
LCK314:   15 - 150 mg/L O2
LCK614:   50 - 300 mg/L O2
LCK714:   100 - 600 mg/L O2
LCK514:   100 - 2000 mg/L O2
LCK114:   150 - 1000 mg/L O2
LCK014:   1000 - 10000 mg/L O2 LCK014:
LCK914:   5000 - 60000 mg/L O2
LCK1014: 100 - 2000 mg/L O2 (for chloride levels up to 4000 mg/L)

New from Jan 2019. Measurable on DR3900 from version 1.24 and on DR6000 from version 1.18:
LCK1814: 7 - 70 mg/L O2 (only suitable for samples with high chloride levels, as it contains a large amount of mercury sulphate that can absorb up to 20 g/L Cl-)

Result reliability, standard control:
ADDISTA Cuvette Test Standard concentration Confidence level
LCA700 LCK1414  30 mg/L O2 +/- 3 mg/L O2
LCA703 LCK114 500 mg/L O2 +/- 30 mg/L O2
LCA704 LCK314  50 mg/L O2 +/- 6 mg/L O2
LCA705 LCK014 5000 mg/L O2 +/- 300 mg/L O2
LCA707 LCK614 200 mg/L O2 +/- 8 mg/L O2
LCA708 LCK514/LCK1014 1000 mg/L O2 +/- 40 mg/L O2
LCA709 LCK614 200 mg/L O2 +/- 8 mg/L O2

Interference:
Methods LCK1414, LCK314, LCK614, LCK714, LCK514, LCK114 are applicable up to a chloride content of 1500 mg/L in the sample (or diluted sample).
Method LCK014 is applicable up to a chloride content of 5000 mg/L in the sample (or diluted sample).
Method LCK1014 is applicable up to a chloride content of 4000 mg/L in the sample (or diluted sample).
Method LCK914 is applicable up to a chloride content of 10 g/L in the sample (or diluted sample).
Method LCK1814 is applicable up to a chloride content of 20 g/L in the sample. Due to the large amount of mercury sulphate (to precipitate high loads of chloride), it is necessary to shake this thoroughly before adding the sample and for the sediment to be entirely settled after the boiling process (it may be necessary to centrifuge the cell).

Higher chloride content requires the sample to be diluted.

Sample preparation:
The samples must be homogenised prior to COD analysis or broken up/pulverised if particles are present.
Parameter-specific sample preparation

Plausibility check:
Every analysis must always be checked by diluting and/or spiking the sample.

Required equipment:
To evaluate the COD cell tests, you will need a HACH photometer, a HT200S high temperature thermostat or LT200 thermostat, a 1.0 - 5.0 ml variable pipette (BBP065), a 1.0 - 5.0 ml pipette tip (BBP068) or a 0.2 - 1.0 ml variable pipette (BBP078), 0.2 - 1.0 ml pipette tip (BBP079)

Information materials:
Operational analysis for wastewater treatment plants
The ideal measurement range for any application
Sources of errors in analysis

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