Final Answer:
Residual fuel from a single filter monitor is:
a. Metal syringe.
Step-by-step explanation:
The metal syringe is used to remove residual fuel from a single filter monitor during field analysis for solids using the color and particle assessment method. This method involves filtering a sample through a membrane filter, and the metal syringe is employed to extract any remaining fuel from the filter. The metal syringe provides a precise and controlled means of removing residual fuel without contaminating the sample.
In this process, after filtration, the filter is carefully placed on a clean surface, and the metal syringe is used to gently extract any remaining fuel. The metal syringe allows for targeted removal, ensuring that only the residual fuel is extracted without disturbing the filtered particles on the membrane.
This step is crucial in obtaining accurate and reliable results in solids analysis, especially when assessing color and particle characteristics. The use of a metal syringe enhances the efficiency and precision of the field analysis, contributing to the overall quality of the analytical process.