摘要
ＧＢ７４９３－８７认为：１００ｍｇ／Ｌ亚硝酸盐氮标准溶液在使用时，应当天配制。现经５０天试验证明，该溶液置于２０℃以下比较稳定。
GB7493-87 states that nitrite standard solution of 1.00mg/L should be prepared before every analysis. The solution showed stable after a test of 50 days.
出处
《环境监测管理与技术》
1997年第2期46-46,共1页
The Administration and Technique of Environmental Monitoring
