Bromine value determination standard substance (bromine value standard sample, bromine value standard substance, bromine value standard substance)

Standard substance for bromine value determination

Name: Bromine Value Determination Standard Material (Bromine Value Standard Sample Bromine Value Standard Material Bromine Value Standard).

Brand: Petrochemical Science Research Institute.

Selling point and application: Produced by the Institute of Petrochemical Science, it is used for the Coulombic determination of bromine value in petrochemical products.

Description: [Bromine Value Standard Substance] The following concentrations are optional: 1.14, 5.02, 11.4, 47.3 gBr/100g.

【 Storage conditions 】 Keep away from light.

Bromine value determination standard substance is a certified standard substance with definite bromine value, metrological traceability, and specialized for determining the content of unsaturated hydrocarbons in petroleum products and organic chemical raw materials.

Core Definition and Metric Attributes

The characteristic value of this standard substance is bromine value, which is defined as the grams of bromine reacting with 100 grams of sample under specified conditions, measured in grams of Br per 100 grams. Similar in physical meaning to the bromine index (measured in mg Br/100g), but with a different magnitude (1 g Br/100g=1000 mg Br/100g), it is suitable for samples with high unsaturated hydrocarbon content. Its standard value is determined collaboratively by legal metrology technical institutions or certified laboratories through accurate absolute measurement methods or a collaborative network composed of multiple high-level laboratories. The fixed value process strictly adheres to the uniformity and stability assessment standards, and the final standard values are accompanied by scientifically evaluated measurement uncertainties to ensure their reliability and international comparability as measurement benchmarks.

Main functions and application scenarios

As a key metrological standard for evaluating the degree of sample unsaturation, its core function is to ensure the accuracy, consistency, and effective traceability of bromine value determination results. Specifically applied to:

Calibration and validation of analytical methods: Used to calibrate analytical systems for bromine value determination based on traditional titration methods (such as ASTM D1159, GB/T 11135, etc.), validate the accuracy and precision of the methods, and particularly evaluate the reliability of endpoint determination in titration.

Product quality control and process monitoring: In the petrochemical industry, it is used to monitor the unsaturated hydrocarbon content in olefin production (such as ethylene and propylene fractions), petroleum fractions (such as cracking gasoline, reforming feedstocks), as well as certain solvents and intermediates. Bromine value is a key indicator for measuring its chemical stability and subsequent processing performance, such as polymerization tendency and gum formation.

Laboratory quality control and capability verification: As a quality control sample with known values, it is used to monitor the long-term stability of the bromine value determination process in the laboratory; It is also a core reference material for inter laboratory comparisons and proficiency testing activities.

Arbitration analysis and scientific research: providing measurement basis for product quality disputes, process condition optimization, and new material research and development.