Page 8 of 859 Titrotherm by Metrohm AG

scope of thermometric titration thermometric titration is a very versatile determination method and an ideal complement to potentiometric titration in principle it is suitable for any reaction that produces a sufficiently large temperature change in the sample solution it is particularly suitable for applications · · · · for which no suitable potentiometric sensor is available for which no suitable reference electrode is available in which the sample affects the indicator electrode or destroys it for which no solvent is available that is suitable for potentiometry typical applications for thermometric titration analyte sulfate phosphate nickel acid mixtures matrix phosphate-containing solutions buffer ph 10 nh3/nh4cl ore leachates electroplating baths containing hf titrant ba2 mg2 dimethylglyoxime naoh application example 1 determination of sulfate and total acid in a nitrating acid mixture nitric acid/sulfuric acid this application demonstrates the flexibility of thermometric titration by performing two sequential titrations «chained titrations» and using just one sensor the contents of sulfuric and nitric acid can be rapidly determined the first titration determines the sulfate content by a precipitation titration with barium chloride the second titration the total acid content with naoh from these two results the ratio of the two acid contents is calculated reagents titrant 1 cbacl2 1 mol/l sulfate determination titrant 2 cnaoh 1 mol/l total acid solvent deionized water titration rate 2 ml/min procedure transfer 40 ml deionized water into the titration vessel add 2.5 ml nitrating acid mixture and titrate first with cbacl2 1 mol/l and then with cnaoh 1 mol/l 8

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