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Titration
New ASTM D8045: Thermometric acid number determination in crude oil

New ASTM D8045: Thermometric acid number determination in crude oil

The ASTM has released a new method for Acid Number (AN) determination in crude oil and petroleum products by thermometric titration. Compared with potentiometric titration (ASTM D664), this method is more robust, faster, and simpler. Above all, this method will save you money, as you will need less solvent per analysis. > See how much...
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OMNIS – an integrated approach to increase productivity and efficiency in the modern laboratory

OMNIS – an integrated approach to increase productivity and efficiency in the modern laboratory

OMNIS is the high-end titration system from Metrohm. It provides users with the possibility to consolidate their wet chemical analysis on a universal platform. With this comes the flexibility to expand and customize this platform as their business grows. Automation possibilities hitherto simply not available help taking productivity to the...
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USP monograph modernization: Chemical medicines assay by potentiometric titration

USP monograph modernization: Chemical medicines assay by potentiometric titration

USP and Metrohm jointly developed a potentiometric titration method for potassium bicarbonate and potassium carbonate assay. The new method uses autotitration combined with suitable equivalence point detection fulfilling all USP method validation requirements as per USP General Chapter . Many of the chemical medicine assay procedures are done by manual...
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Calcium (magnesium) in dairy products

Calcium (magnesium) in dairy products

This Metrohm Bulletin (235/3 e) describes a simple method for the determination of the calcium content in dairy products. The use of CuEGTA and the ion-selective copper electrode (Cu ISE) as indicator electrode allows the determination to be performed without time-consuming sample preparation. Skip time-consuming sample preparation This bulletin describes a...
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Eco Dosimat – new, universal tool boosts productivity in the laboratory

Eco Dosimat – new, universal tool boosts productivity in the laboratory

A great deal of time is spent in laboratories every day on repetitive routine task such as preparing standard solutions, controlling syntheses and/or performing manual titrations. With the new Eco Dosimat, much of this time can be saved, as these tasks are performed faster, easier, and much more reliably. The...
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«Good» fats vs. «bad» fats

«Good» fats vs. «bad» fats

Determine free fatty acid (FFA) content using thermometric titration The free fatty acid (FFA) content points to hydrolytic degradation reactions in the oil. Especially in deep fat frying, where wet foods are immersed into hot fat, water readily cleaves the ester bonds and liberates FFAs. Our Application Bulletin describes the...
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Heavy metals in wine - simple and easy

Heavy metals in wine – simple and easy

Wine sometimes contains heavy metals which can be precipitated out by the addition of potassium ferrocyanide. Generally, these are quantities of iron ranging between 1 and 5 mg, and exceptionally up to 9 mg Fe/L. Zinc, copper, and lead – in descending order of content – may also be present.
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Fully automatic determination of the total content of Ba, Ca, Mg, Pb, and Zn in unused lubricating oils

Total content of Ba, Ca, Mg, Pb, and Zn in unused lubricating oils

This Application Note describes the determination of total content of Ba, Ca, Mg, Pb and Zn in unused lubricating oil by means of the Optrode (610 nm). An excess of EDTA is first added to the metals. Afterwards, the excess EDTA is titrated back with magnesium chloride solution up to...
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Determining the pH value of paper

Determination of total phosphate in phosphoric acid and phosphate fertilizers with 859 Titrotherm

Phosphate can be rapidly and easily titrated thermometrically using a standard solution of Mg2+ as titrant. The phosphate-containing solution is basified and buffered with NH3/NH4Cl solution before titration. The formation of insoluble MgNH4PO4 is exothermic. The method is a titrimetric adaptation of a classical gravimetric procedure.
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Non-aqueous titrations, simplified

Non-aqueous titrations, simplified

Cleaning electrodes getting you down? Relax, the Solvotrode easyClean is here to help. Non-aqueous titrations have a habit of producing gluggy, gelatinous messes that take forever to clean from an electrode. For regular non-aqueous electrodes this means blocked membranes and low electrolyte flow, which in turn leads to slow responses,...
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Water hardness analysis, lighten the workload

Water hardness analysis, lighten the workload

Improve your efficiency and reproducibility with automated titration. Water hardness, the concentration of dissolved calcium and magnesium in water, while not of concern for health purposes, is still a very important component of water quality. Hardness not a health risk, but ... Higher hardness in water results in scaling for...
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Determination of boron in ores by fluoride titration

Determination of Boron in Ores by Fluoride Titration

Determination of boron in ores of the element such as borax and ulexite. Ores of boron such as borax and ulexite may be decomposed by acid digestion to yield boric acid. Acidic solutions of fluoride react exothermically with boric acid according to the equations: To form HBF4, boric acid will...
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The determination of water content in margarine by Karl Fischer 899 Coulometer

Determination of the water content in tablets by automated Karl Fischer titration

The water content of tablets determines the release of their active ingredients as well as their chemical, physical, microbial and shelf-life properties. Accordingly, the water content is of crucial importance and has to be accurately determined. This paper describes the straightforward determination of the water content using automated volumetric Karl...
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The determination of water content in margarine by Karl Fischer 899 Coulometer

The determination of water content in margarine by Karl Fischer 899 Coulometer

The water content of margarine is determined according to Karl Fischer. Metrohm 899 Coulometer with generator electrode without diaphragm Thanks to the integrated stirrer, the 899 Coulometer takes up less space on the laboratory table than a sheet of DIN A4 paper. Although small and compact, the coulometer does not...
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Acid number in raw oils and petroleum products through thermometric titration in accordance with ASTM D8045

Acid number in raw oils and petroleum products through thermometric titration in accordance with ASTM D8045

Corrosion is an omnipresent disruption factor in refinery processes and one that can soon result in astronomical production costs. The potential for corrosion can however be conveniently controlled by monitoring the acid number (also referred to as the acid value) in refinery processes. An outstanding method for making this determination...
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Determination of low water contents in plastics using the KF oven method

Determination of low water contents in plastics using the KF oven method

In many cases it is essential to know the water content of plastics. This is of particular interest in connection with their processing or their use as insulators in electrical engineering. The Application Bulletin 145/3e from Metrohm describes the coulometric determination of water according to the Karl Fischer method, which...
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Water in penicillin-G-potassium

Water in penicillin-G-potassium

Pour ca. 30 mL methanol into the titration vessel, add 5 g salicylic acid and condition the mixture. Then add ca. 1 g sample and start the water determination. The inexpensive 870 KF Titrino plus is a KF titrator for volumetric water content determination. With it, water contents from a...
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Higher product yields, less waste: Determination of metal-organic compounds by thermometric titration

Higher product yields, less waste: Determination of metal-organic compounds by thermometric titration

Metal-organic compounds are commonly used in organic chemistry, for example as Grignard reagents or as strong bases (e.g., butyl lithium compounds). The knowledge of the exact content of reactive species allows to better plan the required amounts for reactions preventing the waste of material or too low yields. The strongly...
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Special Promotion: Upgrade your Titrino Plus, Coulometer or Compact Titrosampler and save

Special Promotion: Upgrade your Titrino Plus, Coulometer or Compact Titrosampler and save

We are now offering 3 amazing instrument packages with huge savings for a limited time to our select customers. Package 1: Metrohm Titrino Plus Series Promotion Package THB 199,000. Package 2: Metrohm Coulometer Promotion Package THB 153,000. Package 3: Metrohm Compact Titrosampler Promotion Package THB 369,000. Download the flyers (English...
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Thermometry – the better method to determine total sodium in foodstuffs

Thermometric titration shares with potentiometric titration the use of a sensor to detect the endpoint of the titration reaction. In the case of thermometric titration, however, the sensor is a fast responding thermometer.  Hence, instead of measuring the electrochemical potential in the solution, this robust, highly sensitive thermometer tracks the...
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