SH/T 0403-1992 Determination of color of paraffin wax

AI-translated method card — human verification pending. This is not an official translation of the standard. Unclear source values remain unverified; check the original standard and product certificate before use.

Card type: Test method

1. Method number / full title / English name / replacement relationship

• Standard number: SH/T 0403-92 (confirmed in 2004)
• Chinese title: Determination of color of paraffin wax
• English title: not provided in the available source
• Replacement relationship: replaces ZB E42 006-88 (the source text writes “replaces 7. B E42 006-88”, requires confirmation against the source standard (source-text extraction))
• Approval/implementation: approved by China Petrochemical Corporation 1992-05-20, implemented on 1992-05-20

2. Scope of application and non-applicability

• Applicable to: paraffin wax.
• Not applicable to: not provided in the available source.

3. Method principle

Determine the color of paraffin wax (after melting into liquid) by comparison using a standard color plate colorimeter.

4. Reagents and materials (purity / preparation)

• 4.1 Potassium dichromate: analytical reagent.
• 4.2 Sulfuric acid: analytical reagent. Prepare into 1%(m/m) sulfuric acid solution.
• Standard colorimetric solution: prepare according to the table below (the original table source-text extraction is severely distorted, and the color numbers and corresponding potassium dichromate mass concentration values cannot be reliably identified, requires confirmation against the source standard (source-text extraction)). The table lists two columns: “color number” and “mass concentration of potassium dichromate in 1%(m/m) sulfuric acid solution, mg/L”; the specific values are not provided in the available source (requires confirmation against the source standard (source-text extraction)).

5. Instruments and equipment

• 4.1 Color plate colorimeter (see Figure 1). The correspondence between the item number and content in the source text requires confirmation against the source standard (source-text extraction).
• 4.2 Color comparison plate: a standard color plate made of organic glass (see Figure 2).
  • Note: Organic glass color plates are prone to aging, so after use they should be stored in a dark place. Every year, the color number of the organic glass color comparison plate must be checked with potassium dichromate sulfuric acid standard colorimetric solution; if the difference exceeds 1 color numbers, the color plate should be replaced.
• 4.3 Color comparison box: equipped inside with 220V 8W lighting lamp (fluorescent lamp).
• 4.4 Color comparison cell: height 80mm, width 40mm, thickness 13mm.
• Figure 1 Outline drawing of the colorimeter: 1— eyepiece; 2— color number hole; 3— place for the color comparison cell.
• Figure 2 Color comparison plate.

6. Recommended operating conditions

• Sample melting temperature: 85℃±2℃ (oven or water bath).
• Color comparison cell preheating: preheat at the above temperature.
• Color comparison box lighting: 220V 8W fluorescent lamp.

7. Sampling and sample preparation

• Place the sample in an oven or water bath at 85℃±2℃ to melt, and filter with filter paper.
• The color comparison cell is also preheated at the above temperature.
• Pour the filtered sample into the preheated color comparison cell for color comparison.

8. Analysis procedure

• 5.1 Turn on the lighting lamp inside the color comparison box, and carefully wipe the eyepiece and color plate of the colorimeter clean with lens paper.
• 5.2 Place the sample in an oven or water bath at 85℃±2℃ to melt, filter with filter paper, and preheat the color comparison cell at the above temperature.
• 5.3 Pour the filtered sample into the preheated color comparison cell for color comparison.
• 5.4 Rotate the color comparison plate, and adjust the color plate color through the eyepiece to match the wax sample color; at this time, the reading of the colorimeter is the color number of the paraffin wax.

9. Qualitative and quantitative determination and calculation formula

• Expression of analysis results: take the larger color number of the two results from repeated determinations as the determination result.
• Calculation formula: not provided in the available source.

10. Precision

The difference between two repeated determination results shall not be greater than 1 color numbers.

11. Report

Not provided in the available source.

12. Referenced documents

Not provided in the available source.

13. Source and verification

This page is an AI translation of the available Chinese method card. Human verification is pending. It is not an official translation of the standard. Check the source standard and product certificate before use.

14. Quick reference Q&A