GB/T 41965-2022 (English Version) PDF

Standard No.: GB/T 41965-2022
Language: Chinese, Available in English version
Release Date: 2022
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 41965-2022

Scope: This document describes a method for the determination of total organic nitrogen and any ammoniacal nitrogen in photographic processing effluents by the Kjeldahl method. This method can determine the total Kjeldahl nitrogen in the waste liquid of photography processing, the concentration range is 10 mg/L~200 mg/L as ammonia, or the concentration range is 8 mg/L~160 mg/L as nitrogen. If the ammoniacal nitrogen is determined separately and subtracted (see ISO 6853), the concentration of organic amino nitrogen can be determined.

GB/T 41965-2022 Referenced Document

ISO 10349-1 Photography - Photographic-grade chemicals; Test methods - Part 1: General
ISO 1042 Laboratory glassware - One-mark volumetric flasks
ISO 5667-2 Water quality; sampling; part 2: guidance on sampling techniques
ISO 5667-3 Water quality*， 2024-02-01 Update
ISO 6353-1 Reagents for chemical analysis; Part 1 : General test methods
ISO 6353-2 Reagents for chemical analysis — Part 2: Specifications — First series — Addendum 2
ISO 6353-3 Reagents for chemical analysis; Part 3 : Specifications; Second series
ISO 648 Laboratory glassware - Single-volume pipettes

2022 GB/T 41965-2022 Photography—Processing waste—Determination of total amino nitrogen(microdiffusion Kjeldahl method)