สิ่งแวดล้อม มลภาวะ ของเสีย
เอกสารมาตรฐาน
สหรัฐอเมริกา
ASTM
D4519-16
Standard Test Method for On-Line Determination of Anions and Carbon Dioxide in High Purity Water by Cation Exchange and Degassed Cation Conductivity
2016
7
ASTM Vol.11.01 (2023)
This on-line test method includes hydrogen exchange and degassing by heating or gas stripping and provides means for determining anions (such as Cl−, SO4—, NO3−, and F−) at levels as low as 2 μg/L (2 ppb) and carbon dioxide at the level of 0.01 to 10 mg/L (ppm) at 25°C in high purity water and in steam and water samples in power plants by measuring electrical conductivity...