GB/T 6730.45-2025 "Iron ore, determination of arsenic content, hydrogen arsenide separation - arsenic-molybdenum blue Spectrophotometric method, spectrophotometry" stipulates the use of hydrogen arsenide separation combined with arsenic-molybdenum blue Spectrophotometric method, spectrophotometry method for the determination of arsenic content in iron ore. The standard specifies the determination principle, reagent materials, equipment, test steps, result calculation and precision requirements, providing a unified specification for the accurate determination of arsenic content in iron ore, suitable for mass inspection and control of iron ore products, helping to ensure the safety and compliance of iron ore processing and utilization process.