A method for the determination of total sulphur in silicate rocks

Abstract

After oxidising sulphides to sulphates with a mixture of sodium chlorate and hydrochloric acid, the sample is refluxed with a reducing mixture of sodium iodide, red phosphorus, hypophosphorous acid, orthophosphoric acid and propionic acid. The hydrogen sulphide generated is absorbed in potassium hydroxide solution and titrated against 2-(hydroxymercuri)benzoic acid solution with dithizone as indicator. The approximate range covered is 5 t o 2000 mg kg-1 of sulphur in the rock.

Determination of sulfur in soda-lime silicate glass by inductively coupled plasma atomic emission spectroscopy following separation using an alumina column

“…25) The other type expels sulfur in the form of hydrogen sulfide and determines the sulfur quantity in the sample by trapping. These methods include distilled separation methylene blue spectrophotometric method, 26),27) Tin(II)-strong phosphoric acid decomposition -iodometric titration, 28) Tin(II)-strong phosphoric acid decomposition ion chromatography, 29) reductiondistillation -hydroxymercuribenzoate titration, 30) hydrophosphorous acid hydroiodic acid reduction 31) and sodium iodide hydroiodic acid hypophosphorous acid reduction. 32) However, these methods require technical skills and a large number of samples.…”

Sulphur

“…The liberated hydrogen sulphide is absorbed in aqueous potassium hydroxide and titrated with 2-(hydroxymercuri)benzDic(12) acid. This procedure, given by Murphy and Sergeant, is also described in detail below.…”