ISO 5282:1982 芳香烃类.硫含量的测定.皮特-鲁普雷克特（Pitt-Ruprecht）还原和分光光 度法

标准编号：ISO 5282:1982

中文名称：芳香烃类.硫含量的测定.皮特-鲁普雷克特（Pitt-Ruprecht）还原和分光光 度法

英文名称：Aromatic hydrocarbons — Determination of sulphur content — Pitt-Ruprecht reduction and spectrophotometric method

发布日期：1982-01

标准范围

与煮沸温度低于200°C的产品有关。直接适用于含量为0.1 mg/kg至30 mg/kg的产品。可通过适当稀释样品来确定较高的含量。烷基砜、芳基磺酸和芳基磺酸酯不能完全回收硫。用雷尼镍将硫化物还原成硫化镍。在盐酸介质中剥离硫化氢，并在碱性醋酸锌溶液中吸收。用N，N-二甲基对苯二胺硫酸盐和硫酸铁（III）铵生成亚甲基蓝。测定667 nm波长下蓝色溶液的吸光度。

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.

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