GB/T 41965-2022 in English

VALID

Photography—Processing waste—Determination of total amino nitrogen (microdiffusion Kjeldahl method)

Issued on:2022-12-30
Implemented on:2023-07-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $210.00
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Standard No:	GB/T 41965-2022
Document status:	VALID
Title in English:	Photography—Processing waste—Determination of total amino nitrogen (microdiffusion Kjeldahl method)
Title in Chinese:	摄影冲洗废液氨态氮总含量的测定 (微扩散凯氏氮法)
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2022-12-30
Implemented on:	2023-07-01
Chinese Classification:	G84-Photographic-grade chemicals
Professional Classification:	GB-National Standard
Related Keywords:	method micro-diffusion kjeldahl nitrogen method total amino nitrogen microdiffusion kjeldahl method amino nitrogen total organic nitrogen
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《GB/T 41965-2022摄影冲洗废液氨态氮总含量的测定（微扩散凯氏氮法）》由TC102（全国感光材料标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。

Introduction

1. Standard background and technological evolution

GB/T41965-2022 is equivalent to ISO6851:2001, with additional terms and definitions, and supplemented with hazard warning symbols and safe operating specifications. This standard is mainly for the determination of total organic nitrogen and ammonia nitrogen in photographic processing wastewater.

2. Principle of the method

Micro-diffusion Kjeldahl nitrogen method uses mercuric sulfate as a catalyst in the presence of sulfuric acid and potassium sulfate to convert amino nitrogen in organic matter into ammonium bisulfate. Subsequently, ammonia is released in a micro-diffusion cell and absorbed into a boric acid solution, and finally the ammonia content is titrated with a standard sulfuric acid solution.

3. Experimental reagents and instruments

Reagents/Instruments	Specifications	Precautions
Mercury sulfate	Red mercury oxide (HgO)	Toxic, protective equipment is required.
Micro diffusion cell	83mm O-type	Need to be cleaned regularly to avoid cross contamination.
Kjeldahl flask	Capacity 100mL	The sealing needs to be checked before high temperature use.

4. Experimental steps

Case analysis: Cleaning process of micro diffusion cell

1. Soak the micro diffusion cell in cleaning solution A (containing sulfuric acid and detergent) for 1 hour.
2. Take it out and soak it in cleaning solution B (containing sodium hydroxide) for 1 hour.
3. Finally, soak it in cleaning solution C (containing sulfuric acid solution) for 1 hour.

More samples: DL/T 368-2010 GB 50021-2001(2009) JC/T 2453-2018

Sample only — not a preview of GB/T 41965-2022