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D3869-15 – Standard Test Method Technical Guide
These test methods establish standardized procedures for determining soluble iodide and bromide ions in brackish water, seawater, and brines. The standard encompasses four test methods—volumetric, colorimetric, and selective electrode techniques—each suited for specific concentration ranges and analytical requirements.
🧪 Standard Test Methods Overview
The standard includes four test methods for iodide and bromide ions, as summarized in the table below:
| 🧪 Test Method | 📏 Analyte | 🎯 Concentration Range |
|---|---|---|
| A – Volumetric | Iodide and Bromide | Iodide: 0.2–2000 mg/L; Bromide: 5–6500 mg/L |
| B – Colorimetric | Iodide | 0.2–2000 mg/L |
| C – Selective Electrode | Iodide | 1–2000 mg/L |
| D – Colorimetric | Bromide | 40–6500 mg/L |
⚙️ Test Procedure and Analytical Techniques
Test Method A (Volumetric) is intended for samples with appreciable amounts of iodide or bromide, using titration for simultaneous determination. Test Methods B and D employ colorimetric analysis, while Method C uses a selective electrode for iodide. Due to their rapidity and sensitivity, Methods B, C, and D are recommended for both field and laboratory analysis.
💡 Tip: For rapid field analysis, choose colorimetric Methods B or D or selective electrode Method C to minimize sample preparation time while maintaining accuracy.
📊 Key Measured Properties and Significance
Iodide and bromide concentrations are critical for identifying brackish water, seawater, and brine types. The methods cover iodide from 0.2 to 2000 mg/L and bromide from 5 to 6500 mg/L. Precision and bias are assessed per Practice D2777. Users must review specific safety precautions in sections 20.2 and 39.2 of the standard.
⚠️ Warning: Review all safety precautions before use. Specific hazards are listed in sections 20.2 and 39.2. Ensure proper handling of reagents and adherence to regulatory limits.
❓ Frequently Asked Questions
🔍 What types of samples can be analyzed?
These test methods apply to brackish water, seawater, and brines for determining soluble iodide and bromide ions.
💡 What are the concentration ranges for each method?
Method A: Iodide 0.2–2000 mg/L, Bromide 5–6500 mg/L. Method B: Iodide 0.2–2000 mg/L. Method C: Iodide 1–2000 mg/L. Method D: Bromide 40–6500 mg/L.
⚡ Which methods are recommended for field analysis?
Test Methods B, C, and D are recommended for field and laboratory analysis due to their rapidity and sensitivity.
📌 What safety precautions are associated with these methods?
Users must establish appropriate safety, health, and environmental practices. Specific precautionary statements are provided in sections 20.2 and 39.2 of the standard.