This document outlines the methods for the determination of phosphorus content in tungsten concentrates, including the Phosphorus Keystone Spectrophotometric method, spectra-trophotometry and Inductance Coupled Plasma Atomic Emission Spectroscopy (AES) methods, and specifies the determination ranges of both methods. Among them, Method 1 is suitable for the determination of phosphorus content between 0.0050% and 1.00%, and Method 2 is suitable for the determination of phosphorus content between > 1.00% and 10.00%. The document emphasizes the adherence to normative reference documents, lists the necessary terms and definitions, and details the principles, reagents or materials required in Method 1.