Application Finder
- AN-T-098Total base number according to IP test method 400
This Application Note describes the conductometric determination of the total base number in engine oil according to IP 400.
- AN-T-099Fully automated determination of acidity in orange juice
The present Application Note describes an automated system with which the acidity can be determined in a wide variety of juice samples. The high degree of automation (e.g., automated calibration and titer determination) reduces errors to a minimum and offers outstanding reproducibility.
- AN-T-100Chloride in acidic copper baths
Acid copper baths are mainly used for the copper deposition on semiconductor wafers. Small amounts of chloride increase the speed of deposition and reduce anode polarization. However, higher concentrations are undesired, as this will decrease the quality of the copper deposition. Therefore, it is quite important to monitor the amount of chloride to have an effective, yet high-quality copper deposition process.In this Application Note, a fully automated solution based on titration is presented. In comparison to ion chromatography, titration offers the benefit that no dilution of the sample is necessary, and the hardware is comparatively low-priced. Furthermore, the fully automated solution allows users to minimize handling errors, to reduce workloads, and to guarantee outstanding reproducibility.
- AN-T-101Fully automated determination of chloride in tap water
This Application Note describes an automated system with which the chloride content in various water samples can be determined. The high degree of automation (e.g., automated addition of acid and titer determination) reduces errors to a minimum and ensures outstanding reproducibility.
- AN-T-102Standardization of hydrochloric acid with TRIS
Titrants are normally bought ready to use. However, it is necessary to determine the accurate concentration of your titrant solution on a regular basis using a primary standard. To correct the mentioned variation, a so-called «titer factor» is applied. The titer can be easily and quickly assessed by using the Metrohm brand of autotitrators. Predefined calculation formulas implemented in Metrohm titrators or software, respectively, as well as the automatic storage of the titer factor, makes standardization a simple task.
- AN-T-103Fully automated determination of aluminum in aqueous solution
In many countries, the aluminum concentration in water is limited to 0.2 mg/L. This application note shows how the analysis of aluminum in water can be done fully automatically by complexometric titration with EDTA.
- AN-T-104Fully automated determination of barium in aqueous solution
This Application Note describes the fully automated complexometric determination of barium in aqueous solutions with a copper ion-selective electrode.
- AN-T-105Fully automated determination of bismuth(III) in aqueous solution
This application note shows how to determine the bismuth content automatically in aqueous solution with potentiometric titration.
- AN-T-106Fully automated determination of calcium in milk
In this Application Note, the determination of calcium in milk is shown with the copper ion-selective electrode which is less sensitive to contamination from proteins.
- AN-T-107Fully automated determination of total iron in cement
This Application Note describes the fully automated complexometric determination of total iron in cement with a copper ion-selective electrode.
- AN-T-108Fully automated determination of zinc(II) in aqueous solution
This Application Note describes the fully automated complexometric determination of zinc(II) in aqueous solutions with a copper ion-selective electrode.
- AN-T-109Iodine value in canola and olive oil
This Application Note presents a modified time-saving method to determine iodine value (IV) in edible oils based on several standards (EN ISO 3961, ASTM D5554, etc.).
- AN-T-110Peroxide value in edible oils
This Application Note details a method to determine the peroxide value of edible fats and oils based on EN ISO 27107, EN ISO 3960, AOAC 965.33, Ph.Eur. 2.5.5, and USP<401>.
- AN-T-111Saponification value of edible oils
The saponification value evaluates edible oil quality by indicating the average molecular weight of fatty acids. Its titrimetric determination in canola and olive oil is described here.
- AN-T-112Acid value and free fatty acids in edible oils
This Application Note describes the titration of acid value and free fatty acids in different edible oils, based on the standards EN ISO 660, USP<401>, and Ph.Eur. 2.5.1.
- AN-T-113Hydroxyl number in castor oil and stearyl alcohol – Fast, pyridine-free method for pharmaceutical samples
The hydroxyl number (HN) is an important sum parameter for quantifying the presence of hydroxyl groups in chemicals. As a key quality parameter, it is determined in various substances. For pharmaceutical samples, USP chapter <401> and Ph. Eur. Chapter 2.5.3 describe the determination. However these methods either use toxic pyridine and require refluxing or have long reaction times.In this Application Note, an alternative method according to ASTM E1899 is presented. This method is pyridine-free and does not require refluxing or long reaction times. The determination is performed at room temperature with only a small sample size. The analysis including all preparation steps is performed with a fully automatic OMNIS system. This allows parallel analysis of multiple samples, increasing productivity in the laboratory by 50%.
- AN-T-114Iodometric determination of ascorbic acid in orange juice
This Application Note describes the iodometric, bivoltametric determination of ascorbic acid in orange juice using the Double Pt-sheet electrode.
- AN-T-115Bivoltametric titration with 2,6-dichlorophenol indophenol for the determination of ascorbic acid in orange juice
This Application Note describes the bivoltametric titration of ascorbic acid in orange juice. 2,6-dichlorophenol indophenol (DPIP) is used as titrant; endpoint determination takes place using the Double Pt-sheet electrode.
- AN-T-116Automatic sulfate determination in aqueous solution using a combined ion-selective calcium electrode (Ca ISE)
This Application Note describes automatic sulfate determination using a combined ion-selective calcium electrode. Sulfate is precipitated with an excess of barium chloride solution. Excess barium is subsequently back-titrated with a standard EGTA solution.
- AN-T-117Automatic determination of aluminum and magnesium mixtures with ion-selective copper electrode (Cu ISE)
Aluminum and magnesium ion mixtures are analyzed using back-titration at different pH values. The ion-selective copper electrode is used here as the indicator electrode. First, the aluminum is determined in acidic solution and then the magnesium in alkali solution.
- AN-T-118Automatic determination of zinc and magnesium mixtures with ion-selective copper electrode (Cu ISE)
Zinc and magnesium ion mixtures are analyzed using back-titration at different pH values. The ion-selective copper electrode is used here as the indicator electrode. First, the zinc is determined in acidic solution and then the magnesium in alkali solution.
- AN-T-119Fully automated determination of chloride (NaCl) in bouillon
This Application Note describes an automated system with which the chloride content in bouillon can be determined. The high degree of automation (e.g., automatic addition of acid and titer determination) reduces errors to a minimum and ensures outstanding reproducibility.
- AN-T-120Automatic manganese determination in aqueous solution using the ion-selective copper electrode (Cu ISE)
Manganese in aqueous solution can be determined using back titration in alkali solution. The ion-selective copper electrode is used here as the indicator electrode.
- AN-T-121Automatic indium determination in aqueous solution using the ion-selective copper electrode (Cu ISE)
This application note shows the use of an ion-selective copper electrode to measure the indium concentration in an aqueous solution.
- AN-T-122Automatic thallium determination in aqueous solution using the ion-selective copper electrode (Cu ISE)
Thallium in aqueous solution can be determined using back titration in a weak acidic solution. The ion-selective copper electrode is used here as the indicator electrode.
- AN-T-123Automatic zirconium determination in aqueous solution with ion-selective copper electrode (Cu ISE)
Zirconium can be analyzed quickly and easily in slightly acidic solutions with back titration. The ion-selective copper electrode is used in this Application Note to determine zirconium in aqueous solution.
- AN-T-124Photometric copper determination in aqueous solution
Copper can be determined using photometric titration with EDTA at a wavelength of 520 nm.
- AN-T-125Automatic determination of cadmium in aqueous solution with the Cu ISE
This application note describes the analysis of cadmium in aqueous solution using a copper ion-selective electrode with Cu-EDTA complex used as an indicator.
- AN-T-126Automatic determination of cobalt in aqueous solution with the Cu ISE
This application note describes the fast, accurate determination of cobalt with a copper ion-selective electrode (Cu ISE) and Cu-EDTA complex as an indicator.
- AN-T-127Automatic determination of copper in aqueous solution with the Cu ISE
This Application Note describes the automated complexometric determination of copper with the Cu ISE.
- AN-T-128Automatic determination of magnesium in aqueous solution with the Cu ISE
Magnesium can be determined with the Cu ISE. A small amount of Cu-EDTA complex is used as an indicator, as the Cu ISE is not selective for magnesium itself.
- AN-T-129Automatic determination of nickel in aqueous solution with the Cu ISE
Nickel can be determined with the Cu ISE. A small amount of Cu-EDTA complex is used as an indicator, as the Cu ISE is not selective for nickel itself.
- AN-T-130Automatic determination of lead in aqueous solution with the Cu ISE
Lead can be analyzed with the Cu ISE. Diammonium tartrate is added to the solution to prevent the precipitation of lead hydroxide in the alkali titration medium.
- AN-T-131Calcium, magnesium, and total hardness in water
Water hardness is often determined photometrically using two different indicators and while performing the determination at two different pH values. Additionally, the determination itself is subjective, as the color change is determined by the analyst and not by an analytical device.This application note introduces a more robust option to easily assess calcium, magnesium, and total hardness in water by using the Cu-ISE and two different titrants. Sample preparation is identical for both analyses and can therefore be automated without any issues.
- AN-T-132Titratable acidity in milk and yogurt
The titratable acidity gives an indication of the freshness of milk and yogurt as well as other fermented milk products. The determined titratable acidity in milk is mainly given through the absorption of hydroxyl ions by milk proteins and milk salts. The acidity increases with bacterial acidification and with enzymatic lipolysis. The titratable acidity corresponds to the amount of sodium hydroxide required to titrate 100 g sample to a pH value of 8.30.In this Application Note, an easy and accurate method to determine the titratable acidity in milk according to DIN 10316 and in yogurt according to ISO/TS 11869 and IDF/RM 150 is demonstrated.
- AN-T-133Chloride in milk and milk powder
In order to maintain product quality, the sodium chloride content in dairy products must be monitored and not exceed the limits defined by the respective public health authorities. The chloride content in food correlates with the salt content, its determination is therefore described in various norms and standards. However, preparation of such samples is time consuming, as it includes a chloride extraction with warm water. Whole milk powders in particular are difficult to handle as an inhomogeneous dispersion of fat in the titration suspension occurs.In order to reduce the workload, increase sample throughput, and eliminate the matrix challenges posed by high fat products, this Application Note presents a fully automatic potentiometric titration of chloride with silver nitrate in milk and milk powder based on ISO 21422, IDF 242, AOAC 2015.07, AOAC 2015.08 and AOAC 2016.03
- AN-T-134Chloride in salted butter – Automated standard method reduces saves time and helps increase throughput
The salt content in food is a critical parameter, given that the WHO recommends a maximum daily intake of 5 g for an adult. In butter with a salt content exceeding 0.1%, it can be determined by a precipitation titration of chloride with silver nitrate. However, during manual titration the operator cannot leave the system unattended because he has to exchange the sample beakers manually which is time consuming and prone to errors.This Application Note describes the automated determination of chloride in salted butter in accordance with ISO 15648, ISO 21422, IDF 179 and IDF 242. If automated according to the norms and standards, salt determination can be performed completely unattended with superior reproducibility of results increasing efficiency in the laboratory.
- AN-T-135Chloride in cheese – Automation reduces sample preparation and increases throughput
The WHO recommends a maximum daily intake of 5 g salt for an adult. The chloride content in food correlates with the salt content, its determination is therefore described by various standards. In cheese and cheese products with a chloride content higher than 0.2%, chloride is usually determined by a precipitation titration with silver nitrate. However, time-consuming sample preparation is required, as the cheese has to be homogenized and the chloride extracted with hot water.This Application Note describes the fully automatic determination of chloride in cheese according to EN ISO 5943, ISO 21422, IDF 242 and IDF 88 including sample preparation with a Polytron homogenizer. This increases productivity due to a higher sample throughput and lower work load for the operator.
- AN-T-136Epoxide equivalents in epoxy resin
The epoxy content of epoxy resins has a strong influence on the reactivity of the resins as well as on the properties of the coating obtained from the resin curing process. The epoxy content is thus an important quality control parameter for manufacturers as well as consumers. This analysis is based on the reaction of hydrogen bromide with the epoxy groups of the sample. Hydrogen bromide in turn is produced by the reaction of tetraethylammonium bromide (TEABr) with standardized perchloric acid. The standards EN ISO 3001 and ASTM D1652 describe the determination of the epoxy content expressed as epoxy equivalent weight (EEW) by titration. The use of a Titrando and Solvotrode easyClean instead of manual titration greatly increases the reproducibility and repeatability of the determination.
- AN-T-137Determination of sulfate in sodium sulfate according to Ph. Eur.
In accordance with the European Pharmacopoeia, sodium sulfate is determined with the PB ISE.
- AN-T-138Determination of inorganic sulfate in secondary alkylsulfonate in accordance with DIN EN 14880
Inorganic sulfate is determined in secondary alklysulfonate (raw material) in accordance with DIN EN 14880 with the use of the Pb ISE.
- AN-T-139Standardization of barium acetate as the titrant for conductometric sulfate titration
Barium acetate is used as titrant for conductometric sulfate determination. It can be standardized with desiccated sodium sulfate.
- AN-T-140Automatic photometric determination of lead using the Optrode
Lead is determined at pH 4 to 5 using back titration with zinc sulfate. Xylenol orange is used as an indicator for visualization of the equivalence point. The equivalence point is detected with the Optrode at a wavelength of 574 mm.
- AN-T-141Automatic photometric determination of manganese using the Optrode
Manganese is determined as Mn(II) in aqueous solutions at pH 10 with Eriochrome Black T as indicator. Ascorbic acid is added to ensure that manganese is present in its bivalent form. The precipitation of water-insoluble manganese hydroxide is prevented by adding triethanolamine (TEA). The Optrode is used for detection at a wavelength of 610 nm.
- AN-T-142Determination of barium using automatic photometric titration
Barium is analyzed in alkali media using direct titration with EDTA. Phthalein purple is used as the indicator; the equivalence point is determined with the Optrode at a wavelength of 574 nm.
- AN-T-143Determination of cobalt using automatic photometric titration
Cobalt is analyzed in aqueous solutions using direct titration with EDTA at a pH value of 9. The indicator is murexide. The equivalence point is determined with the Optrode at a wavelength of 574 nm.
- AN-T-144Mercury analysis using automatic photometric titration
Mercury can be determined in alkali media using back titration with zinc sulfate. Eriochrome black T is used as the indicator for this procedure. The Optrode is used for indication at a wavelength of 502 nm.
- AN-T-145Determination of palladium using automatic photometric titration
Palladium is determined at a pH value of 4 to 5 using back titration with zinc sulfate. Xylenol orange is used as the indicator for visualization of the endpoint. The equivalence point is determined with the Optrode at a wavelength of 610 nm.
- AN-T-146Automatic determination of tin using photometric titration
Tin with EDTA forms very stable complexes in its divalent and tetravalent forms. Hydroxo complexes form in alkali media, which is also why tin is titrated in an acidic medium (pH 2.1). Xylenol orange is used as the indicator. The equivalence point is determined with the Optrode at a wavelength of 574 nm.
- AN-T-147Determination of thallium using automatic photometric titration
Thallium is titrated in slightly acidic medium as Tl(III). Xylenol orange is used as the indicator to determine the endpoint. The equivalence point is determined with the Optrode at a wavelength of 574 nm.
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