CEI CEI Environmental Monitoring & Testing

Question 1

What does a turbidimeter measure in water quality monitoring?

Accepted Answer

Cloudiness caused by suspended particles

Answer

A turbidimeter measures turbidity, the optical clarity of water, by quantifying light scattered by suspended particulate matter.

Question 2

Which chain-of-custody requirement is most critical when collecting environmental samples for legal proceedings?

Accepted Answer

Sample custody must be documented and unbroken from collection to analysis

Answer

An unbroken, documented chain of custody ensures sample integrity and admissibility in legal or regulatory proceedings by tracking possession at every transfer.

Question 3

What does a passive air sampler measure compared to an active air sampler?

Accepted Answer

It collects contaminants by diffusion without a pump over an extended period

Answer

Passive air samplers collect airborne contaminants through diffusion alone — no pump required — allowing time-weighted average concentrations to be measured over days or weeks.

Question 4

In ambient air quality monitoring, what does the acronym 'NAAQS' stand for?

Accepted Answer

National Ambient Air Quality Standards

Answer

NAAQS are EPA standards that set maximum allowable concentrations for six criteria pollutants in outdoor air to protect public health and welfare.

Question 5

Which sampling method involves collecting water from a stream at regular time intervals to create a representative composite sample?

Accepted Answer

Time-integrated composite sampling

Answer

Time-integrated composite sampling combines sub-samples collected at fixed intervals, producing a sample that represents average water quality over the sampling period.

CEI - Certified Environmental Inspector Practice Test

CEI - Certified Environmental Inspector Practice Test

CEI CEI Environmental Monitoring & Testing