CEI CEI Environmental Monitoring & Testing

Question 1

What does a turbidimeter measure in water quality monitoring?

Accepted Answer

Cloudiness caused by suspended particles

Answer

Dissolved oxygen concentration

Answer

Chemical oxygen demand

Answer

Total dissolved solids

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

Samples must be collected only in glass containers

Answer

Samples must be analyzed within 24 hours of collection

Answer

A state inspector must witness all sample collections

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

It measures larger particles only

Answer

It uses a pump to draw air through a sorbent at a fixed flow rate

Answer

It measures only gaseous pollutants, not particulates

Question 4

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

Accepted Answer

National Ambient Air Quality Standards

Answer

Non-Attainment Area Quality Survey

Answer

National Atmospheric Assessment and Quantification System

Answer

Nationwide Air Assurance and Quality Specifications

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

Grab sampling

Answer

Low-flow purging

Answer

Depth-discrete sampling

Question 6

What is the purpose of a field blank in environmental sampling quality control?

Accepted Answer

To detect contamination introduced during sample handling and transport

Answer

To calibrate field instruments before sampling

Answer

To verify laboratory analytical accuracy

Answer

To establish background concentrations at a reference location