Total and dissolved metals measurement context
Total recoverable metals are measured on the whole, unfiltered sample after acid digestion. Dissolved metals are measured on a portion passed through a 0.45 µm filter. Tell us which your permit or program needs before you sample. These methods give the total amount of each element, not its chemical form: hexavalent chromium and arsenic speciation are separate tests. Panels
Define the element list and fraction
Name the elements and state total, total recoverable or dissolved preparation as required. Filtration and preservation belong in the collection plan, and reporting limits must support the project criteria.
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.