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D5708-15 – Standard Test Method Technical Guide
📐 Scope and Methodology Overview
ASTM D5708-15 (Reapproved 2020) defines standardized procedures for determining nickel (Ni), vanadium (V), and iron (Fe) in crude oils and residual fuels via inductively coupled plasma atomic emission spectrometry (ICP-AES). The standard provides two distinct pathways tailored to the physical state of the target analytes within the sample matrix.
Test Method A analyzes a sample dissolved in an organic solvent, using oil-soluble metals for calibration. It is explicitly stated to not quantify insoluble particulates. Test Method B requires complete acid decomposition of the sample, allowing for the determination of total metals content.
| 🟦 Feature | 📐 Test Method A | 📐 Test Method B |
|---|---|---|
| Sample Preparation | Dissolution in organic solvent | Acid decomposition |
| Calibration Standards | Oil-soluble organometallic metals | Aqueous or total digestion standards |
| Insoluble Particulates | Not detected or quantified | Quantified |
| Typical Sample Concentration | 10 % (m/m) | Variable, fully digested |
⚙️ Testing Procedure, Safety, and Instrumentation
For Test Method A, the procedure requires approximately 10 g of sample to be dissolved in an organic solvent to create a 10 % mass/mass specimen solution. This solution is nebulized directly into the