GB/T 7816-2018 (English Version)

Standard No.: GB/T 7816-2018
Language: Chinese, Available in English version
Release Date: 2018
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 7816-2018
Replace: GB/T 7816-1998

Introduction

1. Background and significance of standard formulation

GB/T 7816-2018 "Industrial Yellow Phosphorus" is a revision of the original standard GB/T 7816-1998, which mainly optimizes and supplements the quality requirements, test methods and safety specifications of industrial yellow phosphorus. The background of the formulation of this standard includes:

The arsenic index project has been added to improve product safety.
The dangerous goods symbol has been modified, and the "substances prone to spontaneous combustion" and "toxic substances" symbols have been added.
Some outdated safety warnings have been deleted.

These adjustments fully reflect the standard's attention to environmental protection and personal safety, and also reflect the progress of industry technology.

2. Comparative analysis of standard frameworks

Dimensions	GB/T 7816—1998	GB/T 7816—2018
New content	-	Arsenic index items; Dangerous goods signs adjustment.
Deleted content	Signs for self-igniting items, toxic substances, etc.	-
Retained content	Yellow phosphorus content determination method	Yellow phosphorus content determination method; Benzene and carbon disulfide filtrate disposal method.

3. Interpretation of the core content of the standard

3.1 Technical requirements for industrial yellow phosphorus

According to GB/T 7816-2018 standard, the quality indicators of industrial yellow phosphorus include:

Appearance: It should be paraffin-like in benzene, with a color ranging from light yellow to brown-green.
Yellow phosphorus content (P): Not less than 99.90% (superior product) and 99.80% (first-class product).

3.2 Determination method of arsenic index

The determination of arsenic content adopts the GB/T 7686-2016 standard method, and the specific steps include:

Sample preparation: The yellow phosphorus sample is reacted with nitric acid solution to generate phosphate.
Solution preparation: dilute and transfer to a volumetric flask.
Working curve drawing: establish a linear relationship of arsenic content through standard solution.
Determination and calculation: calculate the mass fraction of arsenic using the absorbance difference.

4. Implementation suggestions

4.1 Implementation suggestions for manufacturers

To ensure that the quality of industrial yellow phosphorus meets the requirements of GB/T 7816-2018, manufacturers should:

Establish a complete raw material procurement and quality inspection system.
Equipped with professional analytical instruments, such as spectrophotometers.
Maintain production equipment regularly to ensure process stability.

4.2 Precautions for users

Enterprises using industrial yellow phosphorus should:

Store products strictly in accordance with the storage conditions specified in the standard.
Wear protective equipment during use and avoid direct contact.
Develop emergency plans to deal with possible leaks or fire accidents.

GB/T 7816-2018 Referenced Document

GB 12268-2012 List of dangerous goods
GB 12463 General specifications for transport packages of dangerous goods
GB 16473 Packing for yellow phosphorus
GB 19358 Safety code for the packaging of yellow phosphorus-Use appraisal
GB/T 6682 Water for analytical laboratory use.Specification and test methods
GB/T 7686 General method for determination of arsenic content of chemical products
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values
HG/T 3696.2 Inorganic chemicals for industrical use.Preparations of standard and reagent solutions for chemical analysis.Part 2: Preparations of standard solutions for impurity
HG/T 3696.3 Inorganic chemicals for industrical use.Preparations of standard and reagent solutions for chemical analysis.Part 3: Preparations of reagent solutions

GB/T 7816-2018 history

2018 GB/T 7816-2018 Yellow phosphorus for industrial use
1998 GB/T 7816-1998 Yellow phosphorus for industrial use