标准摘要
[中文适用范围]： ISO 18191:2015 规定了使用指示剂染料间甲酚紫在总氢离子浓度 pH 范围内分光光度法测定海水 pH 值。总氢离子浓度 [H+]t 以每千克海水的摩尔数表示。该方法适用于测定实际盐度范围为 20 至 40 的正常海水的 pH 7.4 至 8.2 的海洋水平。 [外文原描述]： ISO 18191:2015 specifies a spectrophotometric determination of the pH t of sea water on the total hydrogen ion concentration pH scale using the indicator dye m -cresol purple. The total hydrogen ion concentration, [H + ] t , is expressed as moles per kilogram of sea water. The method is suitable for assaying oceanic levels of pH t 7,4 to 8,2 for normal sea water of practical salinity ranging from 20 to 40.
英文名称Water quality — Determination of pHT in seawater — Method using the indicator dye m-cresol purple