Explain the working mechanism of Rapid immunoassay. List out any two uses.

Rapid immunoassay is an analytical technique widely used for environmental monitoring, particularly for detecting contaminants such as pathogens, chemicals, and pollutants. This method is based on the principle of antigen-antibody interactions, leveraging the specificity and sensitivity of immunological reactions to detect minute quantities of specific substances in environmental samples. The working mechanism of rapid immunoassays is based on the detection of specific biomarkers through a biochemical interaction between an antigen (the substance being measured, such as a pollutant or microorganism) and an antibody (a protein that binds specifically to the antigen).

### Working Mechanism of Rapid Immunoassay:

1. Antigen-Antibody Binding: 
   The core of the immunoassay involves the binding of a specific antigen (e.g., a pesticide, heavy metal ion, or microbial pathogen) to an antibody that has been pre-coated on a solid surface or embedded within a detection matrix. The antibody is typically selected for its high specificity to the target antigen, ensuring that only the presence of the target substance leads to a measurable result.

2. Sample Preparation: 
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