Analysis of the more stable emulsion cleaners can be made at the tank. However, distillation techniques are used for the unstable and diphase cleaners, requiring analysis in a laboratory. To obtain a good representative sampling, samples should be taken from various locations. In an immersion installation, samples should be taken from tanks with a glass tube. In a spray installation, samples should be taken from the jets after the washer has been in operation for some time, because soluble oils become more emulsified as spraying continues. One simple and rapid method of analysis is:

1. Place approximately 90 to 95 mL of emulsion in a 100 mL glass-stoppered graduated cylinder.

2. Measure and record the actual amount of sample.

3. Cautiously add 5 mL of sulfuric acid.

4. Place a stopper on the cylinder and shake until the emulsion begins to break.

5. Allow the emulsion to cool to 20 °C (70 °F) and separate completely.

6. Measure and record the amount of separated emulsifiable material or oil. The volume percentage of oil in the emulsion is the volume of soluble oil divided by the volume of original sample, multiplied by 100.

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