CCIL Sample Management and Preparation 2

Question 1

When a laboratory receives a sample with insufficient volume for all requested analyses, what is the FIRST action that should be taken?

Accepted Answer

Contact the client to discuss options before testing begins

Answer

Client communication is required before proceeding when sample volume is insufficient to ensure proper prioritization.

Question 2

Which chain-of-custody documentation element is MOST critical for legal defensibility of laboratory results?

Accepted Answer

A continuous record of every person who handled the sample

Answer

An unbroken chain of custody documenting every handler is essential to demonstrate sample integrity in legal proceedings.

Question 3

A soil sample for volatile organic compound (VOC) analysis must be stored at what temperature to prevent analyte loss?

Accepted Answer

Refrigerated at 4°C

Answer

VOC soil samples are preserved at 4°C to slow volatilization while preventing freezing that could alter the matrix.

Question 4

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

Accepted Answer

To detect contamination introduced during sample collection and transport

Answer

A field blank uses analyte-free water exposed to field conditions to identify contamination from collection, transport, or handling.

Question 5

Under CCIL accreditation standards, how long must a laboratory typically retain raw data and sample records?

Accepted Answer

5 years

Answer

CCIL and ISO/IEC 17025 generally require retention of records for a minimum of 5 years to support auditability.

CCIL - Canadian Council of Independent Laboratories Practice Test