Water quality — Determination of pHt in sea water — Method using the indicator dye m-cresol purple
水质 - 海水中pHt的测定 - 使用指示剂染料m-甲酚紫的方法
发布日期:
2015-09-01
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标度上分光光度法测定海水的pHt。总氢离子浓度[H+]t表示为每千克海水的摩尔数。该方法适用于测定实际盐度范围为20至40的正常海水的pHt 7,4至8,2的海洋水平。
ISO 18191:2015 specifies a spectrophotometric determination of the pHt 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 pHt 7,4 to 8,2 for normal sea water of practical salinity ranging from 20 to 40.