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D6071-14 – Standard Test Method Technical Guide
🔬 Test Method Overview
This test method, ASTM D6071-14 (Reapproved 2022), is designed for determining trace sodium in high purity water using graphite furnace atomic absorption spectroscopy. It covers a concentration range of 1 to 40 µg/L sodium, with the possibility of range extension after validation. The method is primarily intended for ultra high purity water but can be adapted for other matrices after appropriate validation.
⚙️ Analytical Procedure
A sample volume of several microlitres is deposited onto a graphite tube housed within an electrical furnace. The system is heated in an inert gas environment through a temperature program that includes drying, ashing, and atomization. During the atomization step, ground-state atoms are produced and measured by atomic absorption spectrophotometry. Replicate analysis is critical for accurate quantification at low concentrations.
💡 Technical Note: For reliable results at the lower end of the range (1‑10 µg/L), perform at least three replicate analyses and report the average value.
📊 Key Specifications and Quality Control
The method specifications and quality control requirements are summarized in the tables below.
| 📏 Parameter | 🔢 Specification |
|---|---|
| Concentration Range | 1 – 40 µg/L |
| Sample Volume | Several microlitres |
| Matrix | High Purity Water |
| 📋 Quality Control Element | ⚙️ Requirement |
|---|---|
| Replicate Analysis | Required for low concentrations |
| Spike Recovery | Per Guide D5810 |
| QC Specifications | Per Practice D5847 |
⚠️ Safety: Users must establish appropriate safety, health, and environmental practices before use. Refer to the standard for full safety information.
❓ Frequently Asked Questions
🔍 What is the concentration range for this test method?
The method covers a range of 1 to 40 µg/L of sodium in high purity water.
💡 Can this method be used for matrices other than high purity water?
Yes, but the analyst must determine the suitability of the test method for other matrices.
⚡ Why is replicate analysis recommended?
Replicate analysis and averaging are necessary to accurately determine values at the lower end of the stated range.
📌 What are the key referenced standards?
Key references include Practice D3919 for graphite furnace atomic absorption and Practice D4453 for handling high purity water samples.