PIB 37-314 Product Launch – LCK1814 COD in saltwater (Low Range)


Dokument-ID PIB194


Veröffentlichungsdatum 04.01.2022
PIB 37-314 Product Launch – LCK1814 COD in saltwater (Low Range)
DR 3900 & DR 6000; EU Only; Hach Lab; 12/17/2018
PIB Version
Product Launch
Level One - Customers-Distributors-Internal

Hach is excited to announce the launch of LCK1814 COD in saltwater (Low Range). LCK1814 enables testing of COD concentrations from 7 – 70 mg/L in samples with high chloride concentrations up to 20.000 mg/L. The test can be evaluated on the DR3900 and the DR6000.


  • Product launch of LCK1814 COD in saltwater (Low Range)
  • Testing of COD concentrations from 7 – 70 mg/L
  • Suitable for samples with high chloride concentrations up to 20.000 mg/L
  • Easy to use: no cumbersome sample pretreatment, such as chloride depletion, is required
  • Disposal of reagents at the HACH environmental center
  • LCK1814 can be evaluated on DR3900 and DR6000
  • DR instruments might require Software/Firmware update (see FAQ)



Environmental Situation Summary
It is extremely difficult to analyze low COD concentrations in samples with very high chloride concentrations (e.g. in seawater, specific industrial samples). Today, many environmental laboratories use the standard COD method (Macro methods according ISO6060, DIN-H41, NEN…) while adding additional (1 or 2 spoons) of solid HgSO4 to the sample to mask higher chloride contents.
Other laboratories perform a different but very cumbersome sample pretreatment step (= chloride depletion) after adding concentrated sulfuric acid to the sample. While cooling, the prepared sample will be stirred (fume hood required) to remove excessive chloride as HCl, which needs to be absorbed in an alkaline medium. The evaluation is done after traditional open reflux COD digestion via titration.

Customer Problem
a) smaller labs and industrial labs usually source out such difficult analysis
b) larger labs (commercial labs, certified environmental labs) usually apply the titration method that requires contact with huge amounts of very toxic and corrosive reagents including cumbersome and expensive disposal
c) up to 40% of uncertainty in results

HACH solution
LCK1814 is a safe, reliable and very easy to use method for the photometric detection of COD in saltwater samples. The test enables low range (7 – 70 mg/L) COD testing in water samples that have up to 20.000 mg/L chloride. LCK1814 shows a very good comparison to the results of the standard method while having less variability in results due to using associated calibration curves. Once the chloride concentration of the sample is known, the user can pick the correct calibration curve to receive accurate results.

Customer Benefits
Easy - the method can be easily performed in all laboratories using our standard photometric equipment (DR3900 or DR6000 spectrophotometer, heating block). The LCK1814 works according other COD cuvette tests, just the sample volume with 1.8 mL is different.
Safety at work - no direct contact with toxic reagents (use of LCK cuvette test without any additional mixing of reagents, no cumbersome sample pretreatment necessary, no titration, no glassware cleaning…).
Environmental friendly - including disposal of reagents at the certified HACH environmental center in Dusseldorf with a 75% recycling rate of all test components.

Features & Benefits LCW632


Key Benefits of LCK1814 COD in saltwater (LR)
Product Feature Benefit
Reagent composition is appropriate to mask up to 20.000 mg/L chloride No cumbersome sample pretreatment – just the chloride content should be known
No direct contact with toxic or corrosive reagents Safety at work
Includes disposal at Hach’s environmental center No separate expensive disposal of toxic reagents required

The LCK1814 can be evaluated on the following HACH instruments. Please note that a Software/Firmware update might be required!

  • DR3900
  • DR6000 

NOTE: Using a different photometer would require a customized calibration. Please contact your local Hach support if you need assistance.

Required accessory:
The method requires the use of a reactor (LT200 or HT200S).
To analyze the chloride concentration in the sample we would recommend the chloride cuvette test LCK311 or Hach Quantab Chloride Teststrips (300–6000 ppm Cl–), part number 2751340.

LCK1814 Product page (example UK)

Working procedure (example UK)


Internal Attachments

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