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D4129-05 – Standard Test Method Technical Guide
📐 Sample Introduction Methods
This test method provides flexibility in sample introduction based on sample physical characteristics. For samples free of suspended particles and with normal salt levels, a 0.200-mL aliquot is directly injected into the reaction zone using a syringe. Samples containing solids or high salt concentrations require introduction via combustion boats containing tungsten trioxide (WO₃) or quartz capillaries. This approach ensures accurate total and organic carbon measurement even in challenging matrices such as sediments and brines. The wide concentration range of 2 to 20,000 mg/L can be determined without dilution, and boat or capillary introduction accommodates samples where syringe injection is inappropriate.
| 🟦 Sample Condition | 📏 Introduction Method | ⚡ Sample Volume |
|---|---|---|
| Clear, low salt | Syringe injection | 0.200 mL |
| With solids or high salt | Boat with WO₃ or quartz capillary | As required for boat |
⚙️ Test Procedure and Concentration Range
The sample is homogenized or diluted as necessary. The method employs high temperature oxidation followed by coulometric detection. Per Section 1.1, this test method covers total and organic carbon from 2 to 20,000 mg/L, allowing direct analysis of most water samples without dilution. This wide range enhances efficiency by reducing preparation steps and potential errors.
| 🔍 Parameter | 📐 Specification |
|---|---|
| Analyte | Total and Organic Carbon |
| Concentration Range | 2 to 20,000 mg/L |
| Injection Volume | 0.200 mL (syringe) |
| Detection Method | Coulometric |
📊 Key Measured Properties and Applicability
This test method quantifies total and organic carbon in water. Collaborative testing has validated its application to distilled, deionized, potable, natural, brine, municipal and industrial waste, and water from oil shale retorting. Precision and bias data are based on these matrices; users must validate for other water types. The method is also suitable for brackish waters and brines within the specified concentration range.
⚠️ Safety Awareness: Users must adhere to safety protocols outlined in Sections 9.1 and 10.2.1 of the standard. Proper laboratory practices should be established to handle potential hazards.
💡 Technical Note: For particulate-rich samples, thorough homogenization is critical. Use boat or capillary introduction for high salt or solids to ensure representative analysis and prevent clogging.
❓ Frequently Asked Questions
🔍 What is the concentration range of this test method?
The test method covers total and organic carbon concentrations from 2 to 20,000 mg/L, as per Section 1.1.
💡 How should samples with high salt levels be introduced?
Samples with high salt levels or solids should be placed in combustion boats containing tungsten trioxide (WO₃) or quartz capillaries before introduction into the reaction zone.
⚡ What water types were included in the precision studies?
The collaborative testing included distilled, deionized, potable, natural, brine, municipal and industrial waste, and water derived from oil shale retorting.
📌 Are there specific safety precautions for this test method?
© 2026 TNLab — This article is a technical interpretation for reference only. The original standard as published by ASTM International takes precedence.