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TOC in ultrapure water

The guidelines in the use and production of ultrapure water are already known. Thus, fast and accurate measurements are required to initiate remedial measures in case of contamination. LAR's QuickTOCpurity meets these requirements.

TOC analyzer QuickTOCpurity

QuickTOCpurity for reliable TOC analysis within pure and ultrapure water applications

The guidelines in the use and production of ultrapure water are already known. Thus, fast and accurate measurements are required to initiate remedial measures in case of contamination. LAR's QuickTOCpurity meets these requirements.

The TOC analyser QuickTOCpurity determines reliably the true total organic carbon content (TOC) in lowest measuring ranges, in less than 3 minutes (difference method). This speed guarantees that very short peaks can be determined very well during a daily cycle. With a touch of a button, simple and remote controlled calibration and validation can be initiated at any time. With this method contamination and long downtimes are excluded, in contrast to the use of liquid standards. By using the recognised loop injection ultrapure water impurities in ranges of 0... 2,000 ppb can be determined reliably. Generally, in low TOC ranges the direct method is preferred. In this case a weak acid is only supplied as truly required. Thus, the QuickTOCpurity reduces the demand of acid significantly. With the patented catalyst-free LAR high temperature combustion at 1,200°C samples are completely oxidised. Furthermore, an adaptation to the application is possible by some options, e.g. the multi-stream-option. With this option you can measure up to six different sample streams with one analyser. Each sample stream is individually lead into the analyser in order to avoid cross contamination. Furthermore, you may build in additional detectors to determine the TNb and COD parameters alongside the TOC or TC.

The online TOC analysis became to the preferred and prescribed method to determine the purity of ultrapure water. LAR's QuickTOCpurity easily meets the strict requirements - whether monitoring condensate, boiler feed water or cooling water in the measuring range up to 2,000 ppb. Low operating and maintenance costs in combination with the equipment options such as the multi-stream-measurement make the analyser to an optimal solution for TOC analysis in pure water applications.

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