Online Oil-in-Water Analysis

The OIW application belongs to the most difficult applications on the market. With the QuickTOC, LAR delivers an excellent designed OIW analyser, which easily meets the tough demands that are made upon it.

Online OIW Analyzer

Oil-in-Water Analyzer

Oils, Fats, Grease – How to deal with online analysis in the most difficult application on the market.

Industrial and municipal applications, which use water whilst processing oil, should continually monitor their produced waste water. Failing to do so can lead to shock oil loads, blockages in the piping system and, in the worst case, to damage of the waste water treatment plants` biomass. Impairments within the processing at a production plant can lead to failures and downtime. Any resulting shock organic loads in water then also lead onto complex problems in the treatment of waste water. For an optimal control of the production processes and for an efficient discharge of the waste water the employment of fast Oil-In-Water (OIW) analysers is absolutely necessary.

But the selection of an oil-in-water process analyser can, however, be very problematic. Most of the available OIW methods measure one of the characteristics of the oily compounds in water, for example the fluorescence, the photometer scattering and the UV-absorption measurement method. All these OIW-methods measures indirectly and none of these methods can measure all types of oils and fats. Total Organic Carbon analysers measure directly all types of oil, regardless whether they are from mineral, vegetable or animal origin. In fact, a TOC-analyser is a carbon counter, which responds to all hydrocarbons. For the majority of applications an OIW-analyser does not have to be selective to a specific type or group of oils, simply because no other hydrocarbons are present. Moreover, a TOC-analyser has a large rangeability. Many OIW-Analysers have trouble in handling this highly contaminated oily and fatty waste water.

Not so LAR's QuickTOC analyser. The QuickTOC uses a direct measurement method, which is based on the ultra high temperature combustion at 1,200°C. At this high temperature, all organic compounds in a sample are completely oxidised. Subsequently, the QuickTOC reliably determines all carbon irrespective of its origin, its composition or its consistency as an oil, fat or grease. This is a huge advantage. Due to its innovative design, which is characterized by a minimum of surface areas that come into contact with the sample, it is free of memory effects. Without filtration or dilution techniques, raw waste water samples with up to 50,000 mg/l C can be injected into the oven and then accurately detected.

This application belongs to the most difficult applications on the market. With the QuickTOC, LAR delivers an excellent designed OIW analyser, which easily meets the tough demands that are made upon it.



Press contact

Benjamin Mattejiet
Manager Marketing Communication

+49 30 27 89 58-59


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The total organic carbon (TOC) is one of the most important sum parameters in the assessment of the organic pollution of water. Since it includes all carbon compounds as one mass, it is exactly defined and an absolute quantity. Therefore, it may be determined directly.

Read more about TOC measurement methods.

Total organic carbon analyzers of LAR Process Analysers AG

The chemical oxygen demand (COD) indicates the amount of oxygen which is needed for the oxidation of all organic substances in water and is thus an important indicator for water analysis. It is considered in the planning and controlling of treatment, as well as assessing its efficiency, thus forming the basis for the calculation of waste water charges.

The COD can be determined in laboratory or online, whereby these methods significantly differ in duration and consumables used.

Read more about COD measurement methods.

COD analyzers of LAR Process Analysers AG

The biochemical oxygen demand (BOD) indicates the amount of oxygen which is needed for the biological degradation of organic substances in water.

Since the generally used BOD5 excludes the nitrification part of the process, this parameter is poorly suited for the control of waste water treatment plants. Alternatively, the total BOD is well-suited, due to the determination of the nitrogen as well as the carbonaceous part of biological degradation.

Read more about the online measurement of BOD.

Toxicity is described as the direct harmful effect of a substance on organisms. These effects can already occur at low concentraions of toxic substances and are dependent on the incubation period and the dosage.

Some test methods that are available on the market can detect toxicity by using fish, daphnia, molluscs, algae or luminous bacteria and testing whether a water sample has a toxic effect on the organisms. They do not, however, identify exactly which toxins are present.

Read more about online toxicity measurements.

BOD / toxicity analyzers of LAR Process Analysers AG

The total nitrogen bound (TNb) shows the pollution of water caused by nitrogen compounds. Nitrogen may be present as ammonia, ammonium salts, nitrites, nitrates and organic nitrogen compounds.

In contrast to single measurements of the above-mentioned components, the TNb determination contains all these substances in a single analysis process.

Read more about online TNb measurements.

The total phosphorus (TP) is a sum parameter that shows the organic and inorganic phosphorus compounds in water. Phosphorus is an essential nutrient for humans as well as flora and fauna. However, the substance – depending on its concentration– may cause serious damage.

Read more about online TP measurements.

TN TP analyzer of LAR Process Analysers AG