ISO 2997:1974 工业用磷酸.硫酸盐含量测定.还原和滴定法

标准编号：ISO 2997:1974

中文名称：工业用磷酸.硫酸盐含量测定.还原和滴定法

英文名称：Phosphoric acid for industrial use — Determination of sulphate content — Method by reduction and titrimetry

发布日期：1974-11

标准范围

适用于硫酸盐含量等于或大于0.0005%（m/m）的产品。用氢碘酸和次磷酸的混合物将硫酸盐还原成硫化物进行分析。在丙酮和氢氧化钠溶液的混合物中吸收硫化氢。以双硫腙为指示剂，用醋酸汞（II）标准体积溶液滴定。也得到了IUPAC的批准。

Applicable to products having sulphate contents equal to or more than 0.0005 % (m/m). Analysis by reduction of the sulphate to sulphide by a mixture of hydriodic acid and hypophosphorus acid. Absorption of the hydrogen sulphide evolved in a mixture of acetone and sodium hydroxide solution. Titration with a standard volumetric solution of mercury(II) acetate in the presence of dithizone as indicator. Has also been approved by the IUPAC.

标准预览图