Reliable Detection of Oil in Water

LAR's QuickOIL is an online analyser for the determination of oil in water (OIW). Since oils and fats consist of carbon compounds, TOC analysis (total organic carbon) is particularly suitable for their reliable detection.

Oil-in-Water Analyzer QuickOIL

Oil-in-Water (OIW) Analyzer QuickOIL

LAR's QuickOIL is an online analyzer for the determination of oil in water (OIW). Since oils and fats consist of carbon compounds, TOC analysis (total organic carbon) is particularly suitable for their reliable detection. In contrast to other oil in water detectors, LAR's TOC analyzer determines all types of oils and fats – regardless if they are of animal, vegetable, mineral or synthetic origin. For the assessment of water streams, whether oils and fats are present or not, operators use TOC analyzers to avoid investments in several OIW systems.

The TOC analyzer works with the thermal combustion method at 1,200 °C. The high oxidation potential guarantees the complete thermal decomposition of all sample ingredients to CO2. Thus, there is no need for operators to purchase oxidation promoting catalysts. The produced CO2 is measured by a NDIR detector and then, the TOC value is determined. The innovative process control is charaterized by only three wetted parts. Thus, memory- and carry-over effects are avoided and measurement results are determined within a few minutes. In the case of exceeding the alarm threshold, operators may quickly initiate countermeasures protecting downstream plant areas from pollution.

LAR's QuickOIL is designed for the measurement of up to 6 sample streams. Thus both, the influent as well as the effluent may be reliably monitored by one unit. As a result, investments in several OIW systems are avoided and the operating as well as maintenance costs are minimized.

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