Application Finder
- AB-190Determination of 4-carboxybenzaldehyde in terephthalic acid by polarography
4-Carboxybenzaldehyde, in the following referred to as 4-CBA, can be reduced directly at the dropping mercury electrode (DME) in an ammoniacal solution. After a very simple sample preparation it is now possible to determine the concentration of 4-CBA in terephthalic acid quickly and precisely by polarography down to the lower ppm range.
- AB-443Determination of Glycerin Purity by Potentiometric Titration
This method is applicable to all samples containing glycerin in the absence of other triols or other compounds that react with periodate to produce acidic products. Glycerin may be determined in the presence of glycols. A periodate solution reacts slowly with diols and triols in acidic aqueous media at room temperature. A quantitative amount of formic acid is generated from the reaction with glycerin (a triol). The reaction with diols produces neutral aldehydes. The amount of formic acid generated by this reaction is determined by titration against sodium hydroxide.
- AN-CIC-007Analysis of a standard mixed in liquid using Metrohm Combustion IC
This application describes the determination of fluoride, chloride, bromide and sulfur (as sulfate) in an ethanol standard solution with halo organic (4-halogen benzoic acids; F, Cl and Br) and sulfur organic compounds (3-(Cyclohexylamino)-1-propanesulfonic acid) by means of Metrohm Combustion Ion Chromatography with flame sensor and Inline Matrix Elimination.Keyword: pyrohydrolysis
- AN-COR-019Determining the corrosion rate with INTELLO
Tafel analysis is an important electrochemical technique used to understand reaction kinetics. By studying the Tafel slope, it reveals the rate-determining steps in electrode reactions, aiding fields like corrosion and fuel cell research. This method helps industries optimize processes and improve device performance by tailoring materials and conditions for greater efficiency.
- AN-H-115Determination of hydrofluoric acid, ammonium fluoride, and maleic acid in acid cleaning solutions
A direct thermometric titration (TET) with 2 mol/L NaOH is used to determine the HF, NH4F, and maleic acid (C4H4O4) contents of acid cleaning solutions. Three endpoints (EPs) are obtained, which may be assigned as follows:EP1: C4H4O4 (pKa1 = 1.9), HF (pKa = 3.17)EP2: C4H4O4 (pKa2 = 6.07)EP2: NH4F (pKa = 8.2)The HF content is determined by subtracting the difference (EP2-EP1) from EP1.
- AN-N-038Traces of iodide in acetic acid using amperometric detection
Determination of traces of iodide in acetic acid using anion chromatography with amperometric detection at the carbon paste electrode.
- AN-S-063Phosphate and phosphite in poly(vinylphosphonic acid) using dialysis for sample preparation
Determination of phosphate and phosphite in poly(phosphonic acid) using anion chromatography with conductivity detection after chemical suppression and dialysis for sample preparation.
- AN-S-064Glycolate, acetate, and chloride in monochloroacetic acid
Determination of glycolate, acetate, and chloride in monochloroacetic acid (MCA) using anion chromatography with conductivity detection after chemical suppression.
- AN-S-089Acetate and dichloroacetate in monochloroacetic acid
Determination of acetate and dichloroacetate in chloroacetic acid using anion chromatography with conductivity detection after chemical suppression.
- AN-S-137Fluoride in adipic acid
Determination of fluoride in adipic acid using anion chromatography with conductivity detection after chemical suppression.
- AN-S-146Chloride and sulfate in succinic acid
Determination of chloride and sulfate in succinic acid using anion chromatography with conductivity detection after chemical suppression.
- AN-S-246Sulfate in methanedisulfonic acid
Determination of sulfate in methanedisulfonic acid using anion chromatography with conductivity detection after sequential suppression.
- AN-S-376Fluoride in sodium fluoride gel for pharmaceutical use
Sodium fluoride gel for pharmaceutical use needs to comply with USP requirements. The actual monograph (USP 42) uses two different methods for the identification and the assay. Ion chromatography allows the analysis of these two parameters in one single determination. In the course of the USP monograph modernization, this ion chromatographic approach makes this type of analysis even easier.
- AN-SEC-003UV-Vis spectroelectrochemical cell for conventional electrodes
The development of a novel reflection cell for conventional electrodes facilitates the performance of spectroelectrochemical measurements. This device allows researchers to work in aqueous solutions as well as in organic media due to its chemical resistance.
- AN-T-042Citric and oxalic acid in mixtures
Citric acid and oxalic acid are present in many products, such as foods or chemical solvents (e.g., decontamination solutions). Both acids are reducing agents and citric acid is additionally a powerful antioxidant. Due to their mutual impact (buffer effect), a content calculation is only possible with correction factors for each acid. A fast and accurate determination by potentiometric titration using the dEcotrode plus and sodium hydroxide as titrant can be realized in this Application Note.
- AN-T-192Determination of acid-neutralizing capacity according to USP<301>
This Application Note details the determination of acid-neutralizing capacity (ANC) in several pharmaceutical samples in compliance with USP<301> standards.
- AN-V-002Chromium, manganese, and titanium in polyterephthalic acid solution
Determination of Cr, Mn, and Ti in a PTA solution containing HCl.
- AN-V-003Nickel, cobalt, and iron in polyterephthalic acid solution
Determination of Ni, Co, and Fe in a PTA solution containing HCl.
- AN-V-006Cadmium, lead, and antimony in acetic acid
Determination of Cd, Pb, and Sb in acetic acid.
- AN-V-0624-Carboxybenzaldehyde in polyterephthalic acid
4-Carboxybenzaldehyde can be reduced directly on the DME in a solution containing ammonium.
- AN-V-070Determination of iodide in glacial acetic acid
Iodide contamination in glacial acetic acid poses risks for downstream processes. Cathodic stripping voltammetry (CSV) at the HMDE offers reliable iodide measurement.
