GB/T 20466-2006
Active
T/CAIA SH023-2025
Active
Group standards
T/CAIA SH023-2025 Determination of ammonia nitrogen in surface water using automatic N,N-dimethyl-1-phenyl-1-propanediamine photometry
T/CAIA SH023-2025 Determination of ammonia nitrogen in surface water using automatic N,N-dimethyl-1-phenyl-1-propanediamine photometry
Price:
$ 20.00
Basic Information
Standard Code:
T/CAIA SH023-2025
Standard Type:
Group standards
Standard Status:
Active
is_force_gb:
no
CCS Name:
-
ICS Name:
\nChemical testing of water
Publish Date:
2025-07-01
Implement Date:
2025-08-01
Scope
Scope: This document describes the method for determining the ammonia nitrogen content using the automatic Nessler's reagent photometry method. This document is applicable to the determination of ammonia nitrogen content in surface water, with a detection limit of 0.025 mg/L (calculated as N) and a measurement range of 0.070 mg/L to 2.00 mg/L. Other types of water samples can refer to this document for implementation. Main technical content: In an alkaline medium, Nessler's reagent reacts with ammonia nitrogen to form a light red-brown complex. The ammonia nitrogen content is determined by photometry, and a corresponding calibration curve is established based on the absorbance value after subtracting the blank and its corresponding ammonia nitrogen content.
Development Information
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