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D2331-08 – Standard Test Method Technical Guide
🧪 Preparation of the Analytical Sample
These practices, under ASTM D2331-08 (Reapproved 2022), provide directions for the preparation of water-formed deposits for analysis. The sample is typically obtained following Practices D887 for sampling. The preparation includes preliminary examination to identify physical characteristics before dissolution. The standard emphasizes using individual experience and judgment in applying these procedures to specific problems.
| 🟦 Designation | 📏 Title |
|---|---|
| D887 | Practices for Sampling Water-Formed Deposits |
| D932 | Practice for Filamentous Iron Bacteria in Water and Water-Formed Deposits |
| D933 | Practice for Reporting Results of Examination and Analysis of Water-Formed Deposits |
| D934 | Practices for Identification of Crystalline Compounds in Water-Formed Deposits By X-Ray Diffraction |
| D1129 | Terminology Relating to Water |
| D1193 | Specification for Reagent Water |
| D1245 | Practice for Examination of Water-Formed Deposits by Chemical Microscopy |
| D2332 | Practice for Analysis of Water-Formed Deposits by Wavelength-Dispersive X-Ray Fluorescence |
| E11 | Specification for Woven Wire Test Sieve Cloth and Test Sieves |
🔍 Preliminary Testing of the Analytical Sample
Section 9 of these practices covers preliminary testing of the analytical sample. This involves physical and chemical examinations to determine the nature of the deposit. According to the significance section, deposits in piping from aqueous process streams serve as indicators of fouling, corrosion, or scaling. Rapid analytical techniques are useful for identifying the deposit nature so that treatment schemes can be devised to prevent reoccurrence. Deposits are classified as scale, sludge, corrosion products, or others.
| 📐 Practice Section | 🎯 Description |
|---|---|
| 8 | Preparation of the Analytical Sample |
| 9 | Preliminary Testing of the Analytical Sample |
| 10 | Dissolving the Analytical Sample |
⚗️ Dissolving the Analytical Sample
Section 10 provides methods for dissolving the analytical sample or selectively separating constituents of concern. The choice of dissolution technique depends on the deposit composition and analysis requirements. The user must establish appropriate safety, health, and environmental practices. Note 2 contains a specific warning statement. The standard recommends using reagent water conforming to Specification D1193. The values stated in