Charged aerosol detector

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/charged-aerosol-detector

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the detector classification?Destructive, general-purpose detector
2. What is the detection mechanism?Quantifies analytes based on the electrical charge of aerosol particles
3. How does a Charged Aerosol Detector find chemicals that don’t absorb light?First, the liquid is sprayed into tiny droplets. The water evaporates, leaving solid particles. These particles are charged and their total charge is measured, telling us how much of the chemical is there.
4. Why do scientists use a Charged Aerosol Detector instead of a UV detector?Because many important molecules like sugars, fats, and some medicines don’t absorb UV light. The CAD can detect all of them because it measures mass, not light.

Non-volatile analyte: A chemical substance that does not readily vaporize at standard temperatures and pressures.
Chromatographic eluent: The mobile phase that moves through the stationary phase in chromatography, carrying the sample components.
Corona discharge: An electrical breakdown of a gas in a strong, non-uniform electric field, used for charging particles.