GB/T 7478-1987
Water quality--Determination of ammonium--Distillation and titration method (English Version)

Standard No.

GB/T 7478-1987

Language

Chinese, Available in English version

Release Date

1987

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Status

Withdraw 2010-04

Latest

GB/T 7478-1987

Replace By

HJ 537-2009

Scope

This method is suitable for the determination of ammonium in drinking water and wastewater. Using a 10m1 test portion, the ammonium nitrogen content in the test portion can be determined up to 10 mg, which is equivalent to a sample concentration of up to 1000 mg/L. The minimum detection concentration uses a 250ml test portion, and the minimum detection concentration actually measured (degrees of freedom is 4) is 0.2mg/L of nitrogen. Sensitivity Use 100ml test portion, 1.0m10.02mol/L hydrochloric acid is equivalent to 2.8mg/L nitrogen. Interfering urea may be the main interference, which distills out as ammonia under the specified conditions, causing high results, as well as volatile amines, which are distilled off and react with acids during titration, thus giving high results. Chloramines present in chlorinated samples are also determined in this way.

GB/T 7478-1987 history

• 1987 GB/T 7478-1987 Water quality--Determination of ammonium--Distillation and titration method

GB/T 7478-1987 Water quality--Determination of ammonium--Distillation and titration method was changed to HJ 537-2009 Water quality.Determination of ammonia nitrogen.Distillation-neutralization titration.