Artificial seawater
mixture of dissolved mineral salts (and sometimes vitamins) that simulates seawater
Artificial seawater (abbreviated ASW) is a mixture of dissolved mineral salts (and sometimes vitamins) that simulates seawater. Artificial seawater is primarily used in marine biology and in marine and reef aquaria, and allows the easy preparation of media appropriate for marine organisms (including algae, bacteria, plants and animals). From a scientific perspective, artificial seawater has the advantage of reproducibility over natural seawater since it is a standardized formula. Artificial seawater is also known as synthetic seawater and substitute ocean water.
Industrial and laboratory formulations
A smaller but significant use is in laboratory or fire-fighting applications. In industrial and materials-science contexts, artificial seawater refers to a chemically defined electrolyte used to reproduce the ionic composition and conductivity of natural ocean water for corrosion testing, electrochemical research, and sensor calibration.
The most widely cited formulation, ASTM D1141, specifies concentrations of sodium, chloride, sulfate, magnesium, calcium, potassium, bromide, and strontium that approximate the average composition of seawater with a salinity of about 35 g kg⁻¹. This mixture is deliberately simplified and excludes organic matter or biological nutrients so that the chemical environment is reproducible from batch to batch. It is commonly employed in laboratory methods such as ASTM G31 (immersion corrosion testing), ASTM G44 (alternate immersion), ASTM G78 (crevice corrosion), and the international standard ISO 11130 for corrosion of metals and alloys under controlled conditions.
By contrast, aquarium and aquaculture formulations of artificial seawater—sold under trade names such as Instant Ocean and Reef Crystals—are designed to sustain marine organisms rather than to model corrosion processes.
The public source identifies “Artificial seawater” as mixture of dissolved mineral salts (and sometimes vitamins) that simulates seawater. This brief keeps that definition visible, then builds a research path around Artificial, seawater and mixture.
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This entry incorporates text from “Artificial seawater” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.