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N.C. Department of Environment and Natural Resources

NC Department of Environment and Natural Resources
Water Quality - Methods, PQLs, QA

Water Quality

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Methods, Practical Quantitation Limits, Quality Assurance

Methods and PQL's - Microbiology & Inorganic Chemistry Branch 

Biological and chemical analyses conducted by the Microbiology and Inorganic Chemistry Branch follow EPA-approved analytical methods. The sources of these methods include the USEPA, Standard Methods, and ASTM.

Each analytical procedure has a Practical Quantitation Limit (PQL), which is defined and proposed as "the lowest level achievable among laboratories within specified limits during routine laboratory operation". The PQL is about three to five times the calculated Method Detection Limit (MDL) for the analytical procedure, and represents a practical and routinely achievable reporting limit with a relatively good certainty that any reported value is reliable.

Click on the following link for a list of methods and PQL's: 

Inorganics, Microbiology and Metals

Note: Unless otherwise noted, PQL's and methods are for water samples only.

Quality Assurance Unit (WSS Chemistry Laboratory)

The Quality Assurance (QA) unit is responsible for establishing, implementing and coordinating a comprehensive Quality Assurance/Quality Control (QA/QC) program for environmental sampling and analyses performed by the WSS Chemistry Laboratory (Microbiology and Inorganic Chemistry and Organic Chemistry Branches). The QA/QC unit is dedicated to ensuring that environmental data operations are of a quality that meet or exceed requirements for informed decision making. This unit is responsible for providing information, guidance and expertise in quality control and regulatory compliance issues.

A well-conceived QA program provides a sound framework for the generation of laboratory data that is scientifically valid, representative and legally defensible. The validity and reliability of the data generated by the WSS Chemistry Laboratory are assured by adherence to rigorous QA/QC protocols. The fundamental elements of the WSS Chemistry Laboratory's QA program include Standard Operating Procedures (SOPs), quality control practices, performance testing samples, internal and external audits and an ethics policy.

The QA Officer for the WSS Laboratory branches is Norma (Lori) Good. For questions or more information, please contact Lori by telephone (919-733-3908, extension 256) or by email (norma.good@ncdenr.gov).

Resources:

Qualifier Codes used by WSS Chemistry Lab (revised 3/10/2011)

Remark Codes used for Coalition Data (revised 2/2010)

 

 

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