Water & Emerging Contaminants — Matrix, Method & Data Usability

Emerging-contaminant analysis is defined by the matrix and the decision the data must support. Drinking water, wastewater, groundwater and biosolids each demand appropriate methods, and a result is only defensible when the method's validated matrix matches the sample.

Match the method to the matrix and purpose

EPA drinking-water methods such as 533 and 537.1 apply to drinking water; Method 1633 addresses PFAS in wastewater, surface water, groundwater, soil, biosolids, sediment, landfill leachate and tissue. EPA finalized Method 1633 in January 2024 and has published updates; confirm the current version and the laboratory's validated scope for your matrix before sampling. Using a drinking-water method on wastewater without validation weakens the data.

Control sampling contamination

PFAS and microplastics are ubiquitous; field blanks, appropriate containers and clothing/equipment controls decide whether a low-level result means anything. Ask the laboratory for its sampling instructions, holding times and blank requirements before collecting. Reporting limits and the specific analyte list matter more than a 'PFAS screen' label.

Define the decision and the data package

Regulatory compliance, site investigation, treatment evaluation and research each need different defensibility. State whether results must support a specific regulatory programme and what quality-assurance documentation is required. Laboratory Vortex coordinates requests; the sampling organization and laboratory share responsibility for data quality.

Program-specific method selection

Drinking-water approval under applicable Part 141 provisions differs from Clean Water Act Part 136 and industry-specific requirements. SW-846 concerns solid-waste/RCRA analytical work and is not interchangeable approval. Specify jurisdiction, program, permit, matrix, analytes and reporting limits before choosing methods.

Private request: matrix, analytes, reporting limits, jurisdiction and program/permit.
Provider confirms actual preservation, holding times, containers and approved method edition before sampling.

Method & standards pathways

These grouped guides separate method families, buyer inputs and scope boundaries so requests carry the right designation, edition context and configuration. No universal panel or code acceptance is implied.

Environmental soil: preparation vs measurement vs leaching: SW-846 Method 3050B digests samples for downstream metal measurement; Method 8270E measures semivolatile organics by GC/MS; Method 1311 (TCLP) simulates leaching. Preparation, measurement and leaching are not interchangeable, and TCLP is not total-content analysis.
Microplastics in water: sampling, principles & spectroscopy: ISO 24187 frames analysis principles, ISO 5667-27 guides water sampling and ISO 16094-2 covers vibrational spectroscopy for water with low suspended solids. Parts 1, 3 and 4 of ISO 16094 remain drafts and are not final methods.

Sample considerations

Identify the matrix, suspected sources and the decision the data must support.
Follow the laboratory's container, preservation, blank and holding-time instructions.
Agree analyte lists, reporting limits and the required QA documentation.