Water quality-Determination of nitrite nitrogen-Spectrophotometric method
Water quality-Determination of nitrogen (nitrite) -Spectrophotometric method
(Implemented in GB 7493-87 1987-08-01)
This standard is equivalent to the ISO 6777-1984 "Molecular Absorption Spectrophotometric Method for the Determination of Nitrite Nitrogen in Water". This standard technically modifies and supplements the ISO 6777-1984 standard according to the format of China's standards. This standard specifies the spectrophotometric method for the determination of nitrite nitrogen in drinking water, groundwater, surface water and wastewater.