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D5451-21 – Standard Test Method Technical Guide
🔬 Scope and Significance of the Trier Sampler
This standard practice, designated D5451-21, outlines the procedure for sampling using a trier sampler. The trier, which resembles an elongated scoop (see Fig. 1 in the standard), is specifically designed to collect samples of granular or powdered materials that are moist or sticky. The equipment is effective when the particle diameter of the material is less than one half the diameter of the trier.
The trier can be utilized as a vertical coring device only when it is certain that a relatively complete and cylindrical sample can be extracted. This practice is generally applicable to sampling soils and similar fine-grained cohesive materials. It is intended for use by personnel acquiring the samples.
⚠️ Critical Constraint: The trier must only be used as a vertical coring device when a complete and cylindrical sample is assured. The particle size of the material must be less than half the diameter of the trier.
⚙️ Sampling Equipment, Containers, and Procedure
The trier sampler should be constructed from materials compatible with the substances being sampled. Stainless steel or polytetrafluoroethylene (PTFE)-coated metal is suitable for most situations. Sample containers must be nonreactive, such as plastic or glass. For comprehensive information on containers and sampling plans, users should refer to Guide D4687.
The operational procedure is straightforward: the trier is pushed directly into the material to be sampled, turned to cut a core, and then withdrawn. The extracted core is then removed from the hole. All appropriate information and observations regarding the sample location must be recorded per Guide D4687.
| 🟦 Trier Material | 🧪 Typical Application | 📐 Particle Size Constraint |
|---|---|---|
| Stainless Steel | General-purpose sampling of soils and powders | < 1/2 trier diameter |
| PTFE-Coated Metal | Corrosive substances or reactive environments | < 1/2 trier diameter |
| Plastic/Glass Container | Storage and transport of sample | N/A (nonreactive) |
💡 Best Practice: Decontaminate all field equipment thoroughly following Practice D5088. Integrate this sampling procedure with a robust quality assurance plan as described in Practice D5283.
📊 Compliance with Referenced Standards and Units
The values stated in SI units are regarded as the standard for this practice. All observed and calculated values must conform to the guidelines for significant digits and rounding established in Practice D6026. The user of this standard is responsible for establishing appropriate safety, health, and environmental practices.
This practice is closely linked with several other ASTM standards that provide a framework for quality waste management sampling.
| 📌 Reference Standard | 🔍 Title and Focus | ⚡ Relevance to D5451 |
|---|---|---|
| D4687 | Guide for General Planning of Waste Sampling | Sampling plans, safety, labeling, chain-of-custody |
| D5088 | Practice for Decontamination of Field Equipment | Cleaning procedures for equipment used at waste sites |
| D5283 | Practice for Generation of Environmental Data | QA/QC planning and implementation |
| D6026 | Practice for Using Significant Digits in Geotechnical Data | Guidelines for rounding significant digits |
❓ Frequently Asked Questions
🔍 What type of material is a trier sampler best suited for?
The trier is specifically designed for granular or powdered materials that are moist or sticky, provided the particle diameter is less than one half the diameter of the trier.
💡 What materials are recommended for the construction of the trier?
The standard specifies that stainless steel or polytetrafluoroethylene (PTFE)-coated metal is suitable for most sampling situations to ensure chemical compatibility.
⚡ How is a sample collected using the trier?
The trier is pushed into the material, turned to cut a core, and then removed from the hole. The core is then extracted from the trier.
📌 What units of measurement are mandated by D5451-21?
Values stated in SI units are regarded as the standard. All calculations must adhere to the rounding guidelines in Practice D6026.