SH/T 0580-1994 Determination of oil content in emulsified liquid

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 name / English name / replacement relationship

• Standard number: SH/T 0580-94 (confirmed in 2004)
• Chinese name: Determination of oil content in emulsified liquid
• English name: not provided in the available source
• Replacement relationship: not provided in the available source

2. Scope of application and non-applicability

• Scope of application: This standard applies to emulsified liquids for metalworking.
• Non-applicability: not provided in the available source.

3. Method principle

Add hydrochloric acid to the test sample and shake well, heat at constant temperature to completely separate the oil and water, cool to room temperature, then read the volume of oil, expressed as volume percentage.

4. Reagents and materials (purity / preparation)

• Hydrochloric acid: chemically pure.
• Sodium chloride: analytically pure, prepared as a saturated sodium chloride solution.

5. Apparatus and equipment

• Oil content determination apparatus: 115 mL, with a ground-glass stopper, neck capacity "[unreadable value]ML" (requires confirmation against the source standard (source-text extraction), suspected to be 15 mL), must be graduated, graduation value 0.1 mL, dimensions see the figure below (the source text includes a figure of the oil content determination apparatus).
• Electric thermostatic oven: temperature control accuracy is "119C" (requires confirmation against the source standard (source-text extraction), suspected to be ±1℃).
• Pipette.
• Volumetric pipette: 10 mL.

6. Recommended operating conditions

• Thermostatic oven temperature: 90℃±1℃.
• Heating and constant-temperature time: 2 h; if the oil and water cannot separate, constant-temperature heating may be continued until the oil and water are completely separated.
• 2～3 mL saturated sodium chloride solution may be added, and heating continued to promote separation.

7. Sampling and test sample preparation

• Test sample: 100 mL uniformly mixed test sample.

8. Analysis procedure

1. Add 100 mL uniformly mixed test sample into a clean, dry oil content determination apparatus.
2. Use a volumetric pipette to add 10 mL hydrochloric acid, shake uniformly, then open the stopper to release gas.
3. After standing for a few minutes, place in a 90℃±1℃ electric thermostatic oven, heat at constant temperature for 2 h; if the oil and water cannot separate, constant-temperature heating may be continued until the oil and water are completely separated. Or add 2～3 mL saturated sodium chloride solution, and continue heating to promote separation.
4. Take out the oil content determination apparatus and place it in the air, cool to room temperature, read the volume of oil, reading to 0.05 mL, expressed as the volume percentage of the test sample.
5. Note: When reading the milliliters of separated oil for the oil content of an emulsified liquid test sample in use, the insoluble matter portion between the water and oil phases should not be included.

9. Qualitative and quantitative determination and calculation formula

• Expressed as the volume percentage of oil in the test sample.
• Specific calculation formula: not provided in the available source (the source text only states "expressed as the volume percentage of the test sample").

10. Precision

Judge the reliability of the test results according to the following provisions (95% confidence level).

• Repeatability: the difference between two results obtained by the same operator in repeated determinations shall not be greater than 0.3% (V/V).
• Reproducibility: the difference between two results respectively proposed by different operators in different laboratories shall not be greater than 0.5% (V/V).

11. Report

Take the arithmetic mean of two results from repeated determinations as the test result, and report to one decimal place.

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 Q&A reference