Semivolatile organic compounds by GC/MS measurement context
EPA Method 625: the sample is extracted with methylene chloride at basic and then acidic pH, and the extract is analyzed by GC/MS. The scan covers phenols, chlorinated benzenes, phthalates, nitroaromatics, anilines and polycyclic aromatic hydrocarbons (PAHs) such as naphthalene and benzo(a)pyrene; a PAH-only scan is also offered. Solid samples are tested by EPA SW-846 Method 8270E. Pesticides, PCBs and herbicides
Organophosphorus pesticides measurement context
EPA Method 625, GC/MS: the sample is extracted with methylene chloride, and the pesticides in the extract are identified and measured by their mass spectra. The scan covers 36 organophosphorus pesticides, including diazinon, malathion, chlorpyrifos, dimethoate, methyl and ethyl parathion, phorate and azinphos-methyl (Guthion). Offered for water samples. Priority pollutants and 6PPD-quinone
Confirm matrix and regulatory context
Environmental water, wastewater and companion solids need explicit applicability review. SW-846 and Clean Water Act methods are not automatically interchangeable for permit reporting.
Include the complete project requirement
Provide the matrix, target analytes, required method, fraction, units and reporting limits. Include the permit or monitoring instructions where results will support a regulatory submission. Naming this method does not establish blanket compliance eligibility.
Resolve collection before sampling
Use the bottle, preservation and delivery instructions assigned to the agreed scope. Identify each location and collection time, and document any deviation. The final analytical plan must fit the submitted material and its intended use.
Related testing & guidance
Technical & service references
Vanguard service detailsSource review: November 8, 2026. The agreed method and project scope govern the testing.