GB/T 534-2024 "Industrial Sulfuric Acid":
Release and Implementation: Released on December 31, 2024 and implemented on July 1, 2025.
Scope of application: Suitable for industrial sulfuric acid produced from pyrite, sulfur, smelting flue gas, and other sulfur-containing materials.
Product classification: divided into two categories: concentrated sulfuric acid (H ₂ SO ₄ ≥ 92.5%) and fuming sulfuric acid (free SO ₄ ≥ 20%).
Technical specifications: There are clear regulations on the content of impurities such as iron, lead, mercury, arsenic, etc. in concentrated sulfuric acid and fuming sulfuric acid, for example, the content of high-quality concentrated sulfuric acid iron is ≤ 0.005%; New indicators for heavy metals Cd, Cr, and Tl have been added, with thallium having the strictest limit (≤ 0.00025% -0.001%).
Detection methods: Added ICP-OES method, atomic fluorescence method for measuring Hg, etc.