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Galgo (UK) Ltd
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CHEMetrics - Chemical Oxygen Demand (COD) Photometric Testing System

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CHEMetrics offers two dichromate reactor digestion methods (USEPA-accepted and Mercury-free) for fast, easy, safe determinations of COD levels in waste water — at about 30% lower cost than competitor's vials! Our COD Reagent Vials can be used with CHEMetrics® photometers and with spectrophotometers that accept 16 mm diameter round bottom cells. Furthermore they may be used with Hach® photometers and spectrophotometers without modification of the factory calibrations. - USEPA-accepted for waste water analysis - Lower cost per test - save up to 30% - Mercury-free method also available - Compact and eco-friendly packaging - Spectrophotometer compatible - no need to modify existing equipment or procedures - Product support with a personal touch - Space efficient disposal service option Contact us for a quotation or for our latest Catalogue and Price List.
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CHEMetrics leakproof COD vials contain a premeasured solution of Sulphuric Acid and the oxidant Potassium Dichromate. To perform the test, the analyst removes the screw cap from each vial, adding a premeasured quantity of sample and replacing the cap. The vials are heated for 2 hours at 150°C in a Digestor Block (below left), as heat is required to accelerate the oxidation process. The vials are allowed to cool in a Vial Rack, after which time they can be measured photometrically. The Dichromate in the reagent gives it an orange colour, and the extent to which the colour has faded after digestion is proportionate to the amount of Dichromate used up in the oxidation process, and thus the COD value.

The digested COD vials can be measured using a choice of two types of CHEMetrics photometer, the V-2000 Multi-Analyte Photometer (above middle) or two dedicatedCOD SAM Photometers (above right). Please see the table below for compatability.

CHEMetrics offers two Dichromate Reactor Digestion Methods for the determination of COD in waste water, with and without Mercury. Mercuric Sulphate is used in the former method to eliminate Chloride interferences. If negligible Chloride interference is expected, then the Mercury-Free Method may be an alternative - dependent on reporting requirements.

Why CHEMetrics COD vials?

As well as matching the specifications, CHEMetrics COD Vials have a number of advantages over other COD vials in the marketplace.

Spectrophotometer Compatible

Our COD vials can be measured using any Spectrophotometer that accepts 16 mm sample cells, including a number of Hach Spectrophotometers. Contact us to confirm compatibility if you already possess a spectrophotometer, photometer or colourimeter.

A set of 2 calibration solutions are also available to assist in generating a standard curve specific to your existing non-CHEMetrics instrument.

Leakproof Vials

CHEMetrics leakproof COD vials use a secure screw cap which is lined with Teflon (PTFE). This ensures that the reagent is kept fresh inside the vials during storage but also that risk of leakage and spillage is kept to a minimum during use, maximising user safety.

Disposal Service

Galgo offers a competitive COD vial disposal service with a number of different options for UK customers. It is also more space efficient than many other vendors as the cardboard packaging need not be retained after a COD kit has been used. Pleasecontact us for further details.

COD Test Kits and Accessories

A full list of our COD products and accessories is provided below. CHEMetrics offers four different COD vial test ranges, in different quantity packs, to suit all requirements. The Low Range (LR) and High Range (HR) Mercury-Containing COD vials are USEPA Accepted.