QuickCODlab Provides Fast, Chemical-Free COD for the Laboratory
Fast, Accurate, Low-maintenance Monitoring of COD
About the Standard Method
Fast, Clean, Accurate COD Measurement for Your Lab
Chemical oxygen demand (COD) quantifies the organic load in wastewater, so COD is an important compliance measurement for industrial discharge, and an excellent indicator of influent load for wastewater treatment plants.
Those who routinely perform laboratory tests for COD understand all too well that the standard COD method is an hours-long procedure using several hazardous substances. Fortunately, it is now possible to measure COD quickly, accurately, cleanly and safely in the laboratory, using high temperatures rather than chemicals to oxidize the sample.
With the QuickCODlab, there is now a fast, reagent-free laboratory COD method. The same time-tested method used in the field for online monitoring is now available in a bench-top design. The QuickCODlab follows American Standard Method (ASTM D6238-98), but uses 1200°C instead of the standard 900°C, enabling chemical-free measurement.
The high-temperature method developed by LAR enables complete oxidization of all organic compounds and requires no consumables – no catalysts, no hazardous chemicals and no corrosive reagents. The sample is injected directly into the reactor, oxidized and accurately measured with an O2 gas detector.
With the QuickCODlab, complete measurements are achieved in only three minutes, so several measurements are possible in only 10 minutes. This provides enormous time-savings compared to standard hours-long procedures.
A very high temperature is necessary as some compounds are difficult to oxidize, so a ceramic furnace forms the heart of the QuickCODlab. At 1200°C all constituents oxidize, enabling a complete analysis of oxygen demand.
A precision syringe controls sample volume. A thumb-wheel on the barrel enables the dose (1 to 200 microliters) to be "dialed in" and a spring-loaded plunger removes human variables from the injection process. This approach requires no pre-filtration so the sample is truly representative.
The QuickCODlab software includes five pre-defined user-selectable ranges that span to 100, 200, 1000, 3000 and 10,000 mg/L. Also, user-defined ranges are easily created, stored and retrieved as needed, providing the greatest possible accuracy for labs running samples from many sources.
The high temperature method easily handles salt concentrations of up to 10 grams per liter, and up to 300 grams per liter of sodium chloride with an optional high-salt furnace. Salts are carried with the condensate and collected as solids, so no salt residue forms in the furnace and there is no need for sample dilution, even at high salt concentrations.
The QuickCODlab offers an accurate, clean, fast alternative for your lab.
FEATURES & BENEFITS:
• Measurement ranges to 100, 200, 1000, 3000 and 10,000 mg/L COD, and user-defined ranges to 250,000 mg/L
• Response time: 3 minutes
• COD monitoring
• Measures the real oxygen demand
• Highest combustion temperature (1,200°C) available on the market
• Catalyst-free technique
• Reagent-free analysis
• No filtration necessary
• No memory effects
• Very low maintenance and operational costs
• Industrial Effluent Monitoring
• Monitor Influent Load in Municipal Wastewater Treatment
Optional 60-vessel auto-sampler
YouTube Video: http://tinyurl.com/qcodlab
The standard potassium dichromate method (DIN 38409 H41 H44) and the cuvette version (DIN ISO 15705:2003) use potassium dichromate as an oxidant and silver sulphate as a catalyst. Sulphuric acid and mercuric chloride are also used. This risky cocktail is combined with the sample, heated and simmered for two hours. The COD is calculated from the dichromate residue. Its dependence on hazardous substances makes the standard method a subject of debate. In particular, potassium dichromate has been identified by the EU REACH program as a Substance of Very High Concern (SVHC), and its use is restricted after September 21, 2017. The standard method has a limited accuracy of only ± 20 percent, and since results above 900 mg/L are invalid, dilution is often required – further reducing accuracy. The Standard Method is also prone to outside interferences, such as salts, which can invalidate the results.
While the standard method is inexpensive, it requires significant time and labor, and carries the burden of hazardous material disposal and audits. Those who need to improve accuracy, test more frequently, reduce labor costs or eliminate chemical use now have an alternative - the QuickCODlab.
Technical Specifications for the QuickCODlab