Home / Standards / GB 12157-89 GB 12157-89 Analysis of water for boiler and cooling system—Determination of dissolved oxygen—Internal electrolysis method 锅炉用水和冷却水分析方法 溶解氧的测定 内电解法 Standard Type GB ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A