Water quality--Determination of nitrate nitrogen--phenol disulfonic acid spectrophotometric method
Water quality-Determination of nitrate-Spectrophotometric method with phenol disulfonic acid
(Implemented in GB 7480-87 1987-08-01)
This standard applies to the determination of nitrate nitrogen in drinking water, groundwater and clean water. This method is suitable for the determination of nitrate nitrogen concentration in the range of 0.02 to 2.0 mg / L. When the concentration is higher, fewer samples can be taken for measurement.