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D4382-18 – Standard Test Method Technical Guide
📘 Introduction and Scope
This standard test method, ASTM D4382-18, is designed for the determination of dissolved and total recoverable barium in water and wastewater matrices. The method utilizes atomic absorption spectrophotometry with a graphite furnace, providing high sensitivity for barium detection. It has been evaluated for a range of 33.5 to 132 µg/L and is applicable to various water types including waste treatment plant effluent, lake water, filtered tap water, and well water. The analyst must verify suitability for other matrices.
⚙️ Test Method and Procedure
The test method involves injecting a sample into a graphite furnace atomic absorption spectrophotometer. The sample is placed in a graphite tube, evaporated to dryness, and atomized. The absorbance is measured at the barium resonance line. The concentration is determined by comparison to standards. The method can be adapted by varying injection volume or instrumental settings to detect higher or lower concentrations. For high concentrations, dilution is recommended, but direct aspiration atomic absorption spectrophotometry may be preferred.
💡 Tip: The range of this test method can be extended by adjusting the injection volume or instrumental settings. Always ensure that sample matrix effects are considered for accurate results.
📊 Key Performance Parameters
| 🔬 Parameter | 📏 Specification |
|---|---|
| Evaluated Concentration Range | 33.5 to 132 µg/L |
| Detection Technique | Graphite Furnace Atomic Absorption Spectrophotometry |
| Sample Types Tested | Waste treatment plant effluent, lake water, filtered tap water, well water |
| Unit of Measurement | SI units (µg/L) |
The method adheres to strict quality control practices as outlined in referenced standards like D5847 and D2777. The use of reagent water conforming to Specification D1193 is essential.
❓ Frequently Asked Questions
🔍 What is the concentration range for this test method?
The method has been evaluated for barium concentrations between 33.5 and 132 µg/L. The range can be expanded by altering sample injection volume or instrumental parameters.
💡 Can this method be used for all water types?
It has been successfully applied to waste treatment plant effluent, lake water, filtered tap water, and well water. For other matrices, the analyst must validate the method’s performance.
⚡ What are the safety considerations?
The standard does not address all safety concerns. Users should establish appropriate safety, health, and environmental practices and follow regulatory limitations.
📌 How does this method relate to other barium detection methods?
This graphite furnace method is suitable for lower concentrations, while direct aspiration atomic absorption spectrophotometry is preferred for higher concentrations. Both are part of a comprehensive approach to barium analysis.