Application Finder
- AN-H-060Standardization of 0.1 mol/L perchloric acid in glacial acetic acid
Standardization of 0.1mol/L perchloric acid in glacial acetic acid by catalyzed endpoint thermometric titration.
- AN-H-061Direct titration of sodium
Determination of sodium in salts, process solutions, and foods.
- AN-H-062Standardization of titrant for direct titration of sodium
Standardization of titrant for direct determination of sodium.
- AN-H-064Total base number (TBN) in used motor oils
The determination of the total base number (TBN) in motor oils is accomplished by means of titration with a standard solution made up of trifluoromethanesulfonic acid in glacial acetic acid and isobutyl vinyl ether as reagent for improved end point identification.
- AN-H-065Determination of salts of carboxylic acids by aqueous acidometric titration
Determination of sodium and potassium salts of carboxylic acids in aqueous media. May be used for analysis of reagent purity.
- AN-H-066Carbonate and bicarbonate in solution
Determination of bicarbonate and carbonate in a mixture by sequential thermometric titrations.
- AN-H-067Determination of chloride in Bayer process liquor
Determination of chloride in Bayer process liquor.
- AN-H-068Determination of ferric ion by iodometric titration
Determination of Fe3+ by iodometric titration. Useful if Fe3+ is accompanied by Al3+, Mg2+, Ca2+ and Fe2+.
- AN-H-070Determination of ferric and cupric Ions in copper refining solutions
Determination of Fe3+ and Cu2+ in copper refining solutions by thermometric titration. It was found that the conventional approach of masking Fe3+ to permit the iodometric determination of Cu2+ is not possible in some copper refining solutions.
- AN-H-071Determination of ammonium ions by titration with hypochlorite
Determination of ammonium ions in ammonium salts and mixtures containing ammonium ion.
- AN-H-073Determination of total acid number (TAN) in biodiesel
Determination of Total Acid Number (TAN) values in biodiesel to <0.05 mg KOH/g sample.
- AN-H-074Determination of calcium and magnesium in seawater
Determination of calcium and magnesium in seawater. The method is suitable for determining the effect of caustic soda and alumina refinery aluminate solutions on the calcium and magnesium content of seawater.
- AN-H-075Standardization of tetrasodium EDTA solutions
Standardization of ~1mol/L tetrasodium EDTA solutions for thermometric complexometric analysis.
- AN-H-076Determination of iodine value (IV) in fats and oils
Iodine value (IV) is a measure of the total number of double bonds present in fats and oils. It is expressed as the «number of grams of iodine that will react with the double bonds in 100 grams of fats or oils». The determination is conducted by dissolving a weighed sample in a non-polar solvent such as cyclohexane, then adding glacial acetic acid. The double bonds are reacted with an excess of a solution of iodine monochloride in glacial acetic acid («Wijs solution»). Mercuric ions are added to hasten the reaction. After completion of the reaction, the excess iodine monochloride is decomposed to iodine by the addition of aqueous potassium iodide solution, which is then titrated with standard sodium thiosulfate solution.
- AN-H-077Determination of sodium in brines by aluminum titration
Determination of sodium in seawater and similar brines. This procedure is suitable for the analysis of sodium in seawater contaminated with sodium aluminate solutions emanating from alumina refineries, and seawater which has been used for the neutralization of alumina refinery waste («red mud») slurries.
- AN-H-078Determination of total halides in brines
Determination of total halides (Cl- + Br- +I-) in seawater and similar brines. This procedure is suitable for the analysis of total halides in seawater contaminated with sodium aluminate solutions emanating from alumina refineries, and seawater which has been used for the neutralization of alumina refinery waste («red mud») slurries. Given the small concentration of bromine andiodine in seawater, the total halide content approximates the chloride concentration.
- AN-H-079Determination of free acid in heat exchanger cleaning acid
Determination of free acid in sulfuric acid («acid shot») solutions employed in the removal of silicate scale in heat exchangers. This method is suitable for acid shot solutions where the silicic acid content is so high that the solutions have gelled.
- AN-H-080Determination of total sodium in sodium aluminate liquors by aluminum titration
Determination of the total sodium content of sodium aluminate liquors, such as Bayer Process liquor. This method is suitable for the analysis of all sodium aluminate solutions down to at least 1 g/L as Na2CO3. The determination may be automated by adding an 814 USB sample processor to an 859 Titrotherm.
- AN-H-081Determination of phosphoric and nitric acid in nitrophos liquors
Determination of phosphoric and nitric acids in liquors from the Nitrophos fertilizer manufacturing process.
- AN-H-082Determination of surface acidity in Zeolites and other materials with a high specific surface area
This Application Note outlines the determination of total acidic active surface sites in zeolites with thermometric titration.
- AN-H-083Determination of surface basicity in zeolites and other materials with a high specific surface area
This Application Note shows that the parameter of surface basicity of zeolites can be measured by thermometric titration.
- AN-H-084Determination of mixtures of sulfuric, phosphoric, and nitric acids
Determination of mixtures of sulfuric, phosphoric, and nitric acids. The procedure is suitable for automated analysis using an 814 Sample Processor.
- AN-H-086Determination of sodium in potato chips
Titration of an unfiltered suspension of the sample with a standardized solution of aluminum containing a stoichiometric excess of potassium ions in the presence of ammonium hydrogen difluoride at ~ pH 3 to give an exothermic reaction, forming insoluble NaK2AlF6. The titrant is standardized against a solution prepared from anhydrous sodium sulfate or sodium carbonate. In addition to this application note, you can find more information on thermometric sodium determination in foods in our application video available on YouTube: https://youtu.be/lnCp9jBxoEs
- AN-H-087Determination of hydrofluoric acid by aluminum titration
Determination of hydrofluoric acid in mixed acid etchant solutions.
- AN-H-088Automated determination of total acid number (TAN) in oils
Automated determination of total acid number (TAN) in new and used lubricating oils and crude oils using the 814 USB Sample Processor. Dissolve oil sample in mixture of toluene and 2-propanol, add paraformaldehyde and titrate with 0.1 mol/L or 0.01 mol/L KOH in propan-2-ol. The endpoint is indicated by an endothermic response caused by the base-catalyzed depolymerization of paraformaldehyde.Reference: 1. M. J. D. Carneiro, M. A. Feres Júnior, and O. E. S. Godinho. Determination of the acidity of oils using paraformaldehyde as a thermometric end-point indicator. J. Braz. Chem. Soc. 13 (5) 692-694 (2002)
- AN-H-089Automated analysis of hexafluorosilicic acid
Automated determination of the H2SiF6 and HF contents of industrial grade hexafluorosilicic acid.
- AN-H-090Nickel in electroless nickel solutions by thermometric EDTA titration
Automated thermometric titration of the nickel content of electroless nickel plating solutions. The determination is suitable for fully automated titration employing a 814 Sample Processor.
- AN-H-091Standardization of tetrasodium EDTA solutions with standard magnesium solution
Standardization of 1 mol/L tetrasodium EDTA (Na4EDTA) solutions by titration with standard magnesium solution.
- AN-H-092Analysis of zirconium acetate
Automated determination of the zirconium content of zirconium acetate, as well as other zirconium compounds which can be rendered soluble as zirconium acetate.
- AN-H-093Determination of boric acid by fluoride titration
Determination of boric acid in electroless plating solutions.
- AN-H-094Determination of boron in ores by fluoride titration
Determination of boron in ores of the element such as borax and ulexite.
- AN-H-095Determination of urea by non-aqueous titration
Dissolution of urea in glacial acetic acid, and titration with standard 0.1 mol/L trifluoromethanesulfonic acid in acetic acid using isobutyl vinyl ether as a thermometric endpoint indicator.
- AN-H-096Determination of total base number of lubricating oils
Dissolution of oil in toluene, and titration with standard 0.1 mol/L trifluoromethanesulfonic acid in acetic acid using isobutyl vinyl ether as a thermometric endpoint indicator.
- AN-H-097Determination of calcium and magnesium in harvested salt
A measured amount of salt is titrated directly with a solution of 1 mol/L tetrasodium EDTA to thermometrically determined endpoints for Ca and Mg. Acetylacetone is added to alter the Ca and Mg EDTA stability constants for better endpoint sharpness.
- AN-H-098Determination of hydrofluoric acid in silicon etch solutions
This Application Note describes the determination of fluoride in silicon etch solutions with thermometric titration.
- AN-H-099Determination of potassium hydroxide and silica in alkaline etch solutions
Determination of concentrated potassium hydroxide solutions which had been used for the etching of substrates containing silicon.
- AN-H-100Determination of total acids in highly acidic etch solutions
Determination of the total acids concentration in mixtures of nitric-hydrofluoric acid intended for etching silicon substrates.
- AN-H-101Determination of the water content of mineral acids
A sample of concentrated mineral acid is dissolved in anhydrous acetonitrile, and the water content titrated with a solution of TEOF in acetonitrile. The TEOF reacts exothermically with water in the presence of a strong acid (acting as a catalyst).
- AN-H-102Determination of Hypochlorite by Titration with Ammonium Ion
Hypochlorite ions react with bromide ions to form hypobromite ions, which in turn rapidly oxidize ammonium ions to nitrogen. Hypobromite reacts more rapidly with ammonium than hypochlorite, and is formed in situ (Vogel, 1961). The titration is carried out with in a solution containing bromide and bicarbonate.
- AN-H-103Determination of Calcium and Magnesium in Milk
A measured amount of milk is treated with trichloroacetic acid to coagulate milk solids and liberate calcium and magnesium as dissociated ion. The coagulated milk is filtered or centrifuged, and an aliquot of the clear serum is titrated with a standard solution of 1 mol/L tetra-sodium EDTA to thermometrically determined endpoints for Ca and Mg. Acetylacetone is added to alter the Ca- and Mg- EDTA stability constants for better endpoint sharpness.
- AN-H-104Determination of free acid content of hydrometallurgical leach liquors
A measured amount of acidic hydrometallurgical leach liquor is treated with potassium oxalate solution to mask potential interference from Fe(III) and other metal ions, and then titrated with standard 1 mol/L NaOH solution.
- AN-H-105Determination of nickel in hydrometallurgical leach liquors
A measured amount of acidic hydrometallurgical leach liquor is first treated with hydrogen peroxide to oxidize Fe(II) to Fe(III), then with potassium pyrophosphate solution to mask interference from Fe(III) and other metal ions. Ammonium acetate solution is then added as a pH modifier, before being titrated with standardized disodium dimethylglyoximate to an exothermic endpoint.
- AN-H-106Determination of magnesium content in hydrometallurgical leach liquors
A measured amount of acidic hydrometallurgical leach liquor is treated first with a complexing agent (sodium gluconate). It is then basified to ~pH 10.5 with a NH3 /NH4Cl buffer, prior to the addition of KCN solution to mask Fe(III). Caution! Do not add KCN to solutions of pH below 9! The Fe(III) is then reduced to Fe(II) by additon of ascorbic acid, prior to titrating the Mg content with standard Na4EDTA solution.
- AN-H-107Determination of ferrous ion content in hydrometallurgical leach liquors
A measured amount of acidic hydrometallurgical leach liquor is further acidified with sulfuric acid, prior to being titrated with standard potassium dichromate solution to an exothermic endpoint. Thus, 1 mol K2Cr207 ≡ 6 mol Fe2+.
- AN-H-108Determination of ferric ion in hydrometallurgical leach liquors
A measured amount of acidic hydrometallurgical leach liquor is pH modified with a small amount of glacial acetic acid, and the Fe(III) content reduced to Fe(II) with iodide ion. The liberated iodine is titrated with standard thiosulfate solution to an exothermic endpoint. Thus, 1 mol Fe3+= 1 mol S2O32-.
- AN-H-109Determination of sulfuric acid, hydrofluoric acid, and ammonium bifluoride in acid mixtures
Results from three separate single endpoint titrations are used to calculate the results. The mixture of H2SO4, HF, and NH4F/HF contains H+ from H2SO4, HF, and NH4F/HF, SO42- from H2SO4, and F- from HF and NH4F/HF. Analysis of total H+ («total acids») by NaOH titration, F- by titrating with Al(NO3)3 («total fluoride») and SO42- by titrating with BaCl2 provides the information required to determine the composition of the mixture.
- AN-H-110Determination of sulfate in drinking water by barium chromate displacement
Sulfate is precipitated by reaction with an acidified barium chromate solution. The excess barium chromate is precipitated by basification with ammonia solution. Residual soluble chromate equivalent to the sulfate content of the sample is titrated with a solution of standard ferrous ion to a thermometrically determined endpoint.
- AN-H-111Determination of sulfate in harvested salt
Sulfate is precipitated as barium sulfate by reaction with an acidified barium chromate solution. The excess barium chromate is precipitated by basification with ammonia solution. Residual soluble chromate, equivalent to the sulfate content of the sample, is titrated with a solution of standard ferrous ion to a thermometrically determined endpoint.
- AN-H-112Determination of total sodium in commercial cheeses by thermometric titration
Samples of shredded, grated, or sliced cheese are dispersed with a high-speed disintegrator in a solution of trichloroacetic acid, which denatures protein and assists in the liberation of all sodium from the matrix. Toluene is added in a second step of the dispersion process to assist in the solubilization of fat. Ammonium fluoride solution is then added, and the sodium titrated with a titrant comprising 0.5 mol/L Al(NO3)3 and 1.1 mol/L KNO3 to an exothermic endpoint.Na+ + 2K+ + Al3+ + 6F- ↔ NaK2AlF6 ↓In this determination, ammonium fluoride (NH4F) has been found to give sharper endpoints than ammonium bifluoride (NH4F ∙HF). In addition to this application note, you can find more information on thermometric sodium determination in foods in our application video available on YouTube:https://youtu.be/lnCp9jBxoEs
- AN-H-114Determination of sulfuric acid, nitric acid, and hydrofluoric acid in etch solutions
Two separate titration sequences are required to analyze the mixture:- titration of the HF content with Al(NO3)3 (the «elpasolite» reaction)- titration of the H2SO4 with BaCl2 followed by titration with NaOH to determine the «total acids» contentThe HF, H2SO4, and «total acids» contents are converted to a HNO3 equivalent, with the HNO3 content found by subtracting the HF and H2SO4 from the «total acids» content.