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D5386-24 – Standard Test Method Technical Guide
ASTM D5386-24 specifies an instrumental method for determining the color of near-clear liquids using CIE tristimulus colorimetry, with results expressed on the platinum-cobalt (Pt-Co) scale. This method is designed for clear, haze-free liquids with Pt-Co values in the 0 to 100 range and is applicable to non-fluorescent samples with light absorption characteristics similar to Pt-Co standard solutions.
🎯 Scope and Application
The test method covers the CIE tristimulus measurement of transmission in near-clear liquid samples, converted to the Pt-Co color scale. It applies to clear, haze-free liquids with nominal Pt-Co values from 0 to 100. Results must be rounded in accordance with Practice E29 for conformance to specifications. Values are stated in SI units. The standard was developed following international principles on standardization.
Important: This standard does not address all safety concerns. Users must establish appropriate safety, health, and environmental practices and determine regulatory applicability prior to use.
📏 Measurement Principle and Method
The color of a liquid sample is measured as the difference between the tristimulus values for light transmitted through the sample and those for the transmitted light from the source. Tristimulus colorimetry may be calculated from spectral measurements or obtained directly from a colorimeter. Practice E1455 provides guidance on tristimulus colorimeters, while Test Methods D1686 and D2108 address visual and instrumental measurement of near-clear liquids.
| 🟦 Parameter | 📏 Specification |
|---|---|
| Pt-Co Color Range | 0 to 100 |
| Sample Condition | Clear, free of haze |
| Measurement Basis | CIE Tristimulus Values |
| Key Standard Practice | E308 for computing colors via CIE system |
⚙️ Referenced Standards and Requirements
This method incorporates numerous ASTM standards and a key OSHA document for consistent application. These references cover sampling, quality control, color calculation, and specific test methods.
| 🟦 Standard | 📐 Description |
|---|---|
| D1686 | Color of Solid Aromatic Hydrocarbons (Pt-Co Scale) |
| D2108 | Color of Halogenated Organic Solvents (Pt-Co Scale) |
| E308 | Computing the Colors of Objects Using the CIE System |
| E1455 | Obtaining Colorimetric Data from Tristimulus Colorimeters |
Note: Test Method D8005 is also relevant for color measurement of clear liquids on the Pt-Co scale. Practice D6809 offers guidance on quality assurance.
❓ Frequently Asked Questions
🔍 What is the Pt-Co color range covered by this test method?
The method is applicable to nominal Pt-Co color values from 0 to 100, typical for near-clear liquid samples.
💡 How is tristimulus color measurement obtained?
It can be calculated from spectral transmission measurements using Practice E308 or obtained directly from a tristimulus colorimeter as per Practice E1455.
⚡ What types of samples are suitable for this method?
Clear, haze-free, and non-fluorescent liquids with light absorption characteristics similar to Pt-Co standard solutions are suitable.
📌 Which standard specifies the rounding of test results?
Practice E29 is used for rounding test data to determine conformance with applicable specifications.