實驗室純水的分類與標準：
國家實驗室純水標準(GB/T 6682)依據水的純度(水的導電性)分1、2、3級，1級電導率小于0.1μs/cm;2級電導率小于1.0μs/cm;3級電導率小于5.0μs/cm;

依據實驗室水質用途分為三種級別：
國家實驗室純水標準(GB/T 6682)依據水的純度(水的導電性)分1、2、3級，1級電導率小于0.1μs/cm;2級電導率小于1.0μs/cm;3級電導率小于5.0μs/cm;


The classification and standard of laboratory pure water: The National Laboratory pure water standard GB / t 6682 divides into 1,2,3 grades according to the water's pure conductivity, the first grade conductivity is less than 0.1 s / cm, the second grade conductivity is less than 1.0 s / cm; The conductivity of grade 3 is less than 5.0 s / cm, and is divided into three grades according to the use of laboratory water: National Laboratory pure water standard GB / t 6682 is divided into 1,2 and 3 grades according to the conductivity of pure water The first order conductivity is less than 0.1 s / cm, the second order conductivity is less than 1.0 s / cm, and the third order conductivity is less than 5.0 s / cm