ISO 5282:1982 PDF
Aromatic hydrocarbons — Determination of sulphur content — Pitt-Ruprecht reduction and spectrophotometric method
Aromatic hydrocarbons — Determination of sulphur content — Pitt-Ruprecht reduction and spectrophotometric method
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 6
- Дата публикации:
- 1 января 1982 г.
- Издание:
- ISO IS 5282 edition 1 version 1
- ICS:
- 71.080.15
Relates to products boiling below 200 °C. Directly applicable to contents of 0.1 mg/kg to 30 mg/kg. Higher contents may be determined by a suitable dilution of the sample. Alkylsulphones, arylsulphonic acids and arylsulphonates give incomplete recovery of sulphur. Reduction of the sulphur compounds to nickel sulphide with Raney nickel. Stripping of the hydrogen sulphide in hydrochloric acid medium and absorption in an alkaline zinc acetate solution. Formation of methylene blue with N,N-dimethyl-p-phenylenediamine sulphate and iron(III) ammonium sulphate. Determination of the absorbance of the blue coloured solution at a wavelength of 667 nm.
Abstract
Overview
ISO 5282:1982 defines a laboratory procedure for the determination of sulphur in aromatic hydrocarbons that boil below 200 °C. The method combines the Pitt–Ruprecht reduction (reduction to nickel sulphide using Raney nickel) with methylene‑blue spectrophotometry to quantify hydrogen sulphide after absorption. It is directly applicable for sulphur concentrations from 0.1 mg/kg to 30 mg/kg; higher concentrations can be analysed after suitable dilution.
Key practical features:
- Reduction of sulphur compounds to nickel sulphide with Raney nickel.
- Stripping of generated hydrogen sulphide in an HCl medium and absorption in alkaline zinc acetate solution.
- Formation of methylene blue using N,N-dimethyl-p-phenylenediamine sulphate and iron(III) ammonium sulphate.
- Spectrophotometric measurement of the blue complex at 667 nm (20 mm path length cells).
Key Topics
- Scope and applicability: Aromatic hydrocarbons with boiling point
Технические детали
- Технический комитет
- ISO/TC 47 - Chemistry
- SKU
- ISO 5282:1982
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