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D4374-06 – Standard Test Method Technical Guide
ASTM D4374-06 defines automated test methods for determining total cyanide, weak acid dissociable (WAD) cyanide, and thiocyanate in water and wastewater. These methods utilize continuous flow analysis paired with on-line thin film distillation and ultraviolet (UV) irradiation to accurately differentiate between various cyanide species.
📐 Water Matrices and Cyanide Species
These test methods apply to a broad range of sample matrices including water, waste water (raw sewage, sludge, and effluent), sludge, industrial waste, and sediments. The standard differentiates between several critical cyanide forms to provide a comprehensive toxicity profile.
| 🟦 Species | 📏 Composition & Examples | 🎯 Determination Method |
|---|---|---|
| Total Cyanide | All weak acid dissociable cyanides + strong complexes (e.g., [Fe(CN)6]4−, [Fe(CN)6]3−, [Co(CN)6]3−, Au, Pt complexes) | Direct automated measurement |
| Weak Acid Dissociable (WAD) | Free CN⁻, HCN, [Cd
📥 Standard Documents Download |