sea water
Enable an AI agent to recognise sea water, assess its changing composition and condition, and determine its suitability for a specified use or treatment.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an AI agent to recognise sea water, assess its changing composition and condition, and determine its suitability for a specified use or treatment.
Sea water is the aqueous mixture constituting seas and oceans, containing dissolved salts dominated by chloride and sodium ions, dissolved gases and organic matter, and variable suspended material and organisms.
It can be Collect and characterise a representative sample with traceable location, depth, time and handling.; Compare samples while accounting for salinity conventions, measurement methods and environmental conditions.; Estimate relevant physical properties using a documented seawater formulation within its supported range.; Assess a specified volume against the requirements of cooling, aquaculture, research or treatment feedwater use.; Determine which filtration, disinfection or desalination steps require investigation and subsequent verification.; Detect changes during storage or handling and identify when resampling is needed..
Distinguishing features
Marine provenance distinguishes natural sea water from a laboratory salt solution; salinity alone cannot establish origin.
A multi-ion composition distinguishes sea water from water containing only added sodium chloride.
Freshwater mixing can produce brackish marine water, so a universal salinity cutoff cannot alone resolve the sea-water boundary.
Collection and processing history distinguish sea water from desalinated product water and concentrated process brine.
Clear appearance does not establish purity: dissolved constituents, microorganisms and contaminants require separate assessment.
Scope
+ Marine origin, collection context and traceability of samples or supplied volumes
+ Dissolved salts, gases, nutrients, organic matter and suspended constituents
+ Physical and chemical state under recorded temperature and pressure
+ Biological load, contamination and changes during storage or handling
+ Suitability for a specified use, including required treatment and verification
- Seas and oceans as geographic features or complete circulation systems
- Marine organisms as independently modelled living things
- Pure water, isolated salts and other separated chemical substances
- Artificial seawater formulations and commercial salt mixtures as products
- Desalination plants, intake systems and treatment processes as infrastructure
- Marine ecosystems and regulatory regimes as complete systems
Characteristics
- Marine provenance
- Source sea or ocean, coordinates, collection depth, timestamp and source record Establishes origin and connects observed properties to a particular marine setting.
- Processing condition
- Unprocessed, screened, filtered, disinfected, stored, diluted or concentrated; record treatment sequence Processing changes composition, biological activity and whether the material still falls within this model.
- Salinity
- Record salinity definition, method and scale; Practical Salinity is dimensionless, Absolute Salinity is expressed in g/kg Supports comparison and property calculations without conflating different salinity quantities.
- Major-ion composition
- Constituent-specific concentrations in mmol/kg or mg/kg, with analytical basis Distinguishes a marine salt mixture from simple saline water and informs chemical compatibility.
- Temperature and pressure
- Temperature in °C; pressure in dbar or Pa with absolute or sea-pressure convention Conditions density, gas behaviour and phase boundaries.
- Density
- kg/m³ at stated temperature, salinity and pressure; identify measured or calculated value Supports mass-volume conversion and interpretation of buoyancy and stratification.
- Carbonate chemistry
- pH with scale and temperature; total alkalinity and dissolved inorganic carbon in µmol/kg Supports interpretation of acid-base condition and carbonate precipitation or dissolution.
- Dissolved oxygen
- µmol/kg or mg/L; saturation percentage with calculation conditions Helps assess oxygen availability and changes caused by biological activity or gas exchange.
- Suspended material and optical condition
- Suspended solids in mg/L; turbidity with instrument-specific unit and method Informs filtration needs and distinguishes measured particles from visual clarity.
- Biological and contaminant burden
- Target-specific organism counts, assay results or chemical concentrations, with detection limits Supports use-specific assessment without treating untested hazards as absent.
- Use suitability
- Unassessed, suitable, conditionally suitable or unsuitable for a named use and criterion set Prevents a result for one application from being mistaken for general safety or fitness.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 18 findings · 28 questions.
Marine identity and boundaries Establishes which marine material is represented and how mixing or processing affects its identity.
Sea water is a variable natural mixture whose identity depends on provenance as well as composition.
Source water context
Connects a sample or volume to its marine origin.
Marine origin evidence
Record the collection location, depth, time and evidence supporting marine origin.
- Which sea, coastal area or offshore water body supplied this water, and where and when was it collected? provenance
- Does the record describe an individual sample, a collected batch or a changing intake stream? definition
Mixing and processing boundaries
Distinguishes marine variability from transformation into a neighbouring material.
Identity after change
Record freshwater mixing, evaporation and processing before deciding whether this entry remains applicable.
- What freshwater inputs, evaporation or treatment have altered the water since its marine source? provenance
- Should the resulting material remain sea water or be linked to a model for artificial seawater, desalinated water or process brine? boundary
Salts and dissolved chemistry Describes the dissolved mixture and the conventions used to quantify it.
Salinity alone does not establish ionic composition, acid-base condition or suitability for an application.
Salinity and ion balance
Makes salinity values interpretable alongside constituent measurements.
Salt mixture characterisation
Record the salinity quantity and relevant major-ion concentrations with their measurement basis.
- Which salinity quantity was reported, and how was it measured or derived? measurement
- Are sodium, chloride, magnesium, sulfate, calcium and potassium measured, or assumed from a reference composition? measurement
Carbonate, gases and nutrients
Captures dissolved constituents that respond to exchange, biological activity and chemical reactions.
Reactive dissolved condition
Record carbonate-system measurements, oxygen and relevant nutrients without inferring missing quantities from appearance.
- Which pH scale, measurement temperature and carbonate-system quantities are available? measurement
- What dissolved oxygen and nutrient measurements are needed to judge the intended use or observed condition? measurement
Physical state and phase behaviour Connects physical properties to salinity, temperature, pressure and phase changes.
Sea water cannot be assigned the fixed physical constants of a pure substance.
Condition-dependent properties
Qualifies measured or calculated properties by the conditions under which they apply.
Property calculation basis
Attach environmental conditions and calculation conventions to density and other physical properties.
- At what temperature, salinity and pressure was density measured or calculated? measurement
- Which seawater formulation supports any estimated viscosity, sound speed or heat capacity, and is this sample within its range? provenance
Freezing and concentration
Tracks changes caused by ice formation, evaporation and salt precipitation.
Phase-change material balance
Distinguish the remaining liquid from separated ice, vapour or solids when phase changes alter composition.
- Has freezing, evaporation or precipitation changed the composition of the remaining liquid? measurement
- Does the reported sample include ice or precipitated salts, or only the separated liquid fraction? boundary
Biological load and sample integrity Captures living, particulate and contaminant constituents together with changes after collection.
Natural sea water contains components that may vary rapidly and may be changed or lost during sampling.
Particles, organisms and contaminants
Separates measured burdens from appearance and unsupported absence claims.
Constituent-specific assessment
Record targeted particle, organism and contaminant results with methods and detection limits.
- Which suspended solids, microorganisms, algal toxins or chemical contaminants were actually tested? measurement
- Do the methods and detection limits support the proposed use-specific conclusion? action
Collection and storage effects
Determines whether a stored sample still represents the source water for the property being assessed.
Sample representativeness
Record handling conditions that can change gases, organisms, particles or dissolved chemistry.
- What container, filtration, preservation, headspace, storage temperature and elapsed time apply? provenance
- Could settling, gas exchange, biological activity or container interaction require a new sample for this measurement? action
Use suitability and treatment Connects measured condition to a named application and the evidence needed before use.
Acceptability depends on the application, receiving system and applicable criteria, rather than a universal sea-water grade.
Application and material compatibility
Assesses relevant composition and condition against the needs of the intended recipient or equipment.
Fitness for named use
Make suitability conditional on a specified application and its biological, chemical and engineering requirements.
- What application is proposed, and which salinity, biological-load and contaminant criteria apply? action
- Which receiving organisms or wetted materials constrain temperature, corrosion, scaling or fouling tolerance? boundary
Treatment and applicable classification
Links required changes and classifications to the actual material and intended jurisdiction.
Verified treatment outcome
Record the intended treatment outcome, evidence of achievement and any applicable supplier or regulatory classification.
- Which constituents must be removed or adjusted, and what post-treatment measurements will establish success? action
- Which supplier record or jurisdiction-specific rule establishes any claimed identifier, hazard classification or use restriction for this material? provenance
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Sea water is a variable natural mixture, so a single molecular formula, purity specification or universal hazard classification is inappropriate.
- Practical Salinity under PSS-78 is dimensionless; it should not be treated as identical to Absolute Salinity expressed in g/kg.
- Reported property values require temperature, pressure, salinity and measurement conventions; the ranges here are recalled approximations, not researched specifications.
- Which of these check these first hold for the sense of sea water this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Open-ocean sea water
- Coastal sea water
- Surface sea water
- Deep sea water
- Brackish sea water
- Hypersaline sea water
- Which of these kinds and varieties hold for the sense of sea water this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- TEOS-10, adopted by UNESCO's Intergovernmental Oceanographic Commission, provides the thermodynamic framework for calculating seawater properties.
- The Practical Salinity Scale 1978 (PSS-78), developed through international oceanographic bodies including UNESCO, ICES, SCOR and IAPSO, defines practical salinity from conductivity measurements.
- Which of these standards and regulation hold for the sense of sea water this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Feedwater for desalination
- Cooling water for coastal industrial facilities and power stations
- Marine aquaculture
- Production of sea salt and recovery of dissolved minerals
- Oceanographic observation and climate research
- Which of these real-world use hold for the sense of sea water this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Dissolved salt mass fraction - Approximately 33-37 in much of the open ocean; coastal and enclosed waters can differ substantially - g/kg
- Density - Approximately 1020-1030 near atmospheric pressure, depending on temperature and salinity - kg/m³
- Surface pH - Approximately 7.8-8.3; depends on location, season and the pH scale used - dimensionless
- Initial freezing temperature - Approximately −1.9 at salinity near 35 g/kg and atmospheric pressure - °C
- Which of these typical measurements hold for the sense of sea water this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Chloride-rich water promotes corrosion, including pitting of susceptible metals.
- Biological growth and mineral deposits can foul pipes, filters and heat exchangers.
- High salt content makes untreated sea water unsuitable as drinking water.
- Pathogens, harmful algal products and chemical pollutants can occur; their presence depends on local conditions.
- Salt intrusion can impair freshwater supplies and damage salt-sensitive soils and crops.
- Which of these failure modes and hazards hold for the sense of sea water this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- River inflow and precipitation lower salinity, while evaporation and restricted exchange can raise it.
- Polar waters undergo seasonal changes associated with sea-ice formation and melting.
- Temperature, oxygen, nutrients and carbonate chemistry vary with latitude, depth, circulation and biological activity.
- Which of these regional variation hold for the sense of sea water this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Fresh water - Has much lower dissolved salt content; sea water is the saline mixture associated with marine waters.
- Brackish water - Has salinity intermediate between fresh water and ordinary sea water and can occur in both marine and inland settings.
- Brine - Denotes highly saline water, generally more concentrated than ordinary sea water, regardless of origin.
- Sodium chloride solution - Contains sodium chloride in water but need not contain the other major ions and constituents characteristic of sea water.
- Artificial seawater - Is deliberately formulated to reproduce selected seawater properties rather than collected from a sea or ocean.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of sea water this model covers, and on what evidence? provenance
What the second pass must settle
- Does an existing Vercy world model already own sea water or the broader natural saline-water concept?
- What registry boundary should apply to estuarine mixtures, naturally hypersaline marine water and heavily processed sea water?
- Which authoritative seawater measurement conventions and property formulations should the model adopt, including limits for unusual compositions?
- Which intended applications and jurisdictions should supply concrete acceptance criteria, sampling requirements and retesting intervals?
- Are any chemical registry identifiers or hazard classifications applicable to the specific natural mixture or supplied grade, rather than to an artificial formulation or individual constituent?