6533b833fe1ef96bd129b60d
RESEARCH PRODUCT
Observations on the use of a sulfuric acid medium for As(V) to As(III) reduction in lodimetric titrations: Application to the determination of total arsenic
F. Bosch MossiF. Bosch ReigV. Peris MartinezJ. V. Gimeno Adelantadosubject
chemistry.chemical_classificationAcid concentrationIodideInorganic chemistrychemistry.chemical_elementHydrochloric acidSulfuric acidAnalytical ChemistryReduction (complexity)chemistry.chemical_compoundchemistrySodium hydroxideTitrationSpectroscopyArsenicdescription
Abstract The use of a sulfuric rather than a hydrochloric acid medium for the reduction of As(V) to As(III) by iodide is proposed. Optimum conditions of acid concentration, amount of sodium hydroxide, and time and temperature are established to achieve quantitative reduction. The optimized reduction procedure was applied to the iodimetric determination of total arsenic and compared to a procedure that employs a hydrochloric acid medium. A systematic error of 0.04% was found for the method with a sulfuric acid medium opposed to 0.05% for the method with a hydrochloric acid medium in the reduction step. The proposed modified iodimetric method has been successfully used with some organic samples requiring a prior destructive treatment of the organic matrix.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1991-10-01 | Microchemical Journal |