Genomic Standards Consortium package extension for reporting of measurements and observations obtained from the environment where the sample was obtained. By choosing the environmental package, a selection of fields can be made from a relevant subsets of the GSC terms.
A Study is a container for a sequencing investigation that may comprise multiple experiments. The Study has an overall goal, but is otherwise minimally defined in the SRA. A Study is composed of a descriptor, zero or more experiments, and zero or more analyses. The submitter may decorate the Study with web links and properties.
| Field name | Cardinality | Description | Controlled vocabulary |
|---|---|---|---|
| alias | mandatory | Unique identificator for a study. this is used to link experiments to the study. | |
| title | mandatory | Title of the study as would be used in a publication. | |
| study_type | mandatory | The study_type presents a controlled vocabulary for expressing the overall purpose of the study. | Whole Genome Sequencing, Metagenomics, Transcriptome Analysis, Resequencing, Epigenetics, Synthetic Genomics, Forensic or Paleo-genomics, Gene Regulation Study, Cancer Genomics, Population Genomics, RNASeq, Exome Sequencing, Pooled Clone Sequencing, Transcriptome Sequencing, Other |
| new_study_type | optional | Optional if 'study_type' is not 'other'. to propose a new term, select other and enter a new study type. | |
| study_abstract | optional | Briefly describes the goals, purpose, and scope of the study. this need not be listed if it can be inherited from a referenced publication. |
An experiment object serves as a metadata record encapsulating essential details about a sequencing experiment, including the experimental design, sequencing type, and relevant parameters. This information enhances the interpretation and contextual understanding of nucleotide sequences submitted to the archive.
| Field name | Cardinality | Description | Controlled vocabulary |
|---|---|---|---|
| alias | mandatory | Unique identificator for each experiment. this is used to link runs to experiments. | |
| title | mandatory | Short text that can be used to call out experiment records in searches or in displays. this element is technically optional but should be used for all new records. | |
| study_alias | mandatory | Identifies the parent study. (from study metadata) | |
| sample_alias | mandatory | (from sample metadata) | |
| design_description | mandatory | Goal and setup of the individual library including library was constructed. | |
| library_name | optional | The submitter's name for this library. | |
| library_strategy | mandatory | Sequencing technique intended for this library. | WGS, WGA, WXS, RNA-Seq, ssRNA-seq, snRNA-seq, miRNA-Seq, ncRNA-Seq, FL-cDNA, EST, Hi-C, ATAC-seq, WCS, RAD-Seq, CLONE, POOLCLONE, AMPLICON, CLONEEND, FINISHING, ChIP-Seq, MNase-Seq, DNase-Hypersensitivity, Bisulfite-Seq, CTS, MRE-Seq, MeDIP-Seq, MBD-Seq, Tn-Seq, VALIDATION, FAIRE-seq, SELEX, RIP-Seq, ChIA-PET, Synthetic-Long-Read, Targeted-Capture, Tethered Chromatin Conformation Capture, NOMe-Seq, ChM-Seq, GBS, Ribo-Seq, OTHER |
| library_source | mandatory | The library_source specifies the type of source material that is being sequenced. | GENOMIC, GENOMIC SINGLE CELL, TRANSCRIPTOMIC, TRANSCRIPTOMIC SINGLE CELL, METAGENOMIC, METATRANSCRIPTOMIC, SYNTHETIC, VIRAL RNA, OTHER |
| library_selection | mandatory | Method used to enrich the target in the sequence library preparation | RANDOM, PCR, RANDOM PCR, RT-PCR, HMPR, MF, repeat fractionation, size fractionation, MSLL, cDNA, cDNA_randomPriming, cDNA_oligo_dT, PolyA, Oligo-dT, Inverse rRNA, Inverse rRNA selection, ChIP, ChIP-Seq, MNase, DNase, Hybrid Selection, Reduced Representation, Restriction Digest, 5-methylcytidine antibody, MBD2 protein methyl-CpG binding domain, CAGE, RACE, MDA, padlock probes capture method, other, unspecified |
| library_layout | mandatory | Library_layout specifies whether to expect single, paired, or other configuration of reads. in the case of paired reads, information about the relative distance and orientation is specified. | |
| insert_size | optional | Insert size for paired reads | |
| library_construction_protocol | optional | Free form text describing the protocol by which the sequencing library was constructed. | |
| platform | mandatory | The platform record selects which sequencing platform and platform-specific runtime parameters. this will be determined by the center. optional if 'instrument_model' is provided. | LS454, ILLUMINA, HELICOS, ABI_SOLID, COMPLETE_GENOMICS, BGISEQ, OXFORD_NANOPORE, PACBIO_SMRT, ION_TORRENT, CAPILLARY, DNBSEQ, ELEMENT, ULTIMA, VELA_DIAGNOSTICS, GENAPSYS, GENEMIND, TAPESTRI |
| instrument_model | mandatory | Model of the sequencing instrument. | 454 GS, 454 GS 20, 454 GS FLX, 454 GS FLX Titanium, 454 GS FLX+, 454 GS Junior, AB 310 Genetic Analyzer, AB 3130 Genetic Analyzer, AB 3130xL Genetic Analyzer, AB 3500 Genetic Analyzer, AB 3500xL Genetic Analyzer, AB 3730 Genetic Analyzer, AB 3730xL Genetic Analyzer, AB 5500 Genetic Analyzer, AB 5500xl Genetic Analyzer, AB 5500xl-W Genetic Analysis System, AB SOLiD 3 Plus System, AB SOLiD 4 System, AB SOLiD 4hq System, AB SOLiD PI System, AB SOLiD System, AB SOLiD System 2.0, AB SOLiD System 3.0, BGISEQ-50, BGISEQ-500, Complete Genomics, DNBSEQ-G400, DNBSEQ-G400 FAST, DNBSEQ-G50, DNBSEQ-T7, Element AVITI, FASTASeq 300, GENIUS, GS111, Genapsys Sequencer, GenoCare 1600, GenoLab M, GridION, Helicos HeliScope, HiSeq X Five, HiSeq X Ten, Illumina Genome Analyzer, Illumina Genome Analyzer II, Illumina Genome Analyzer IIx, Illumina HiScanSQ, Illumina HiSeq 1000, Illumina HiSeq 1500, Illumina HiSeq 2000, Illumina HiSeq 2500, Illumina HiSeq 3000, Illumina HiSeq 4000, Illumina HiSeq X, Illumina MiSeq, Illumina MiniSeq, Illumina NovaSeq 6000, Illumina NovaSeq X, Illumina iSeq 100, Ion GeneStudio S5, Ion GeneStudio S5 Plus, Ion GeneStudio S5 Prime, Ion Torrent Genexus, Ion Torrent PGM, Ion Torrent Proton, Ion Torrent S5, Ion Torrent S5 XL, MGISEQ-2000RS, MinION, NextSeq 1000, NextSeq 2000, NextSeq 500, NextSeq 550, Onso, PacBio RS, PacBio RS II, PromethION, Revio, Sentosa SQ301, Sequel, Sequel II, Sequel IIe, Tapestri, UG 100, unspecified |
A run contains a group of reads generated for a particular experiment.
| Field name | Cardinality | Description | Controlled vocabulary |
|---|---|---|---|
| alias | mandatory | Unique identificator for each run. | |
| experiment_alias | mandatory | From_experiment_metadata | |
| file_name | mandatory | The name or relative pathname of a run data file. | |
| file_format | mandatory | The run data file model. | sra, srf, sff, fastq, fasta, tab, 454_native, 454_native_seq, 454_native_qual, Helicos_native, Illumina_native, Illumina_native_seq, Illumina_native_prb, Illumina_native_int, Illumina_native_qseq, Illumina_native_scarf, SOLiD_native, SOLiD_native_csfasta, SOLiD_native_qual, PacBio_HDF5, bam, cram, CompleteGenomics_native, OxfordNanopore_native |
A Sample defines an isolate of sequenceable material upon which sequencing experiments can be based. The Sample object may be a surrogate for taxonomy accession or an anonymized individual identifier. Or, it may fully specify provenance and isolation method of the starting material.
| Field name | Cardinality | Description | Controlled vocabulary |
|---|---|---|---|
| alias | mandatory | Unique identificator for each sample. | |
| title | mandatory | Short text that can be used to call out sample records in search results or in displays. | |
| taxon_id | mandatory | Ncbi taxonomy identifier. this is appropriate for individual organisms and some environmental samples. | |
| sample_description | optional | Free-form text describing the sample, its origin, and its method of isolation. | |
| trophic level | optional | Trophic levels are the feeding position in a food chain. microbes can be a range of producers (e.g. chemolithotroph) | autotroph, carboxydotroph, chemoautotroph, chemoheterotroph, chemolithoautotroph, chemolithotroph, chemoorganoheterotroph, chemoorganotroph, chemosynthetic, chemotroph, copiotroph, diazotroph, facultative autotroph, heterotroph, lithoautotroph, lithoheterotroph, lithotroph, methanotroph, methylotroph, mixotroph, obligate chemoautolithotroph, oligotroph, organoheterotroph, organotroph, photoautotroph, photoheterotroph, photolithoautotroph, photolithotroph, photosynthetic, phototroph |
| observed biotic relationship | optional | Description of relationship(s) between the subject organism and other organism(s) it is associated with. e.g., parasite on species x; mutualist with species y. the target organism is the subject of the relationship, and the other organism(s) is the object. | commensal, free living, mutualism, parasite, symbiont |
| known pathogenicity | optional | To what is the entity pathogenic, for instance plant, fungi, bacteria | |
| relationship to oxygen | optional | Is this organism an aerobe, anaerobe? please note that aerobic and anaerobic are valid descriptors for microbial environments | aerobe, anaerobe, facultative, microaerophilic, microanaerobe, obligate aerobe, obligate anaerobe |
| propagation | optional | The type of reproduction from the parent stock. values for this field is specific to different taxa. for phage or virus: lytic/lysogenic/temperate/obligately lytic. for plasmids: incompatibility group. for eukaryotes: sexual/asexual. mandatory for migs of eukayotes, plasmids and viruses. | |
| sample collection device | optional | The device used to collect an environmental sample. it is recommended to use terms listed under environmental sampling device (http://purl.obolibrary.org/obo/envo) and/or terms listed under specimen collection device (http://purl.obolibrary.org/obo/genepio_0002094). | |
| sample collection method | optional | The method employed for collecting the sample. can be provided in the form of a pmid, doi, url or text. | |
| sample storage temperature | optional | Temperature at which sample was stored, e.g. -80 (Units: °C) | |
| sample storage location | optional | Location at which sample was stored, usually name of a specific freezer/room. indicate the location name. | |
| size-fraction lower threshold | optional | Refers to the mesh/pore size used to retain the sample. materials smaller than the size threshold are excluded from the sample (Units: µm) | |
| size-fraction upper threshold | optional | Refers to the mesh/pore size used to pre-filter/pre-sort the sample. materials larger than the size threshold are excluded from the sample (Units: µm) | |
| oxygenation status of sample | optional | Oxygenation status of sample | aerobic, anaerobic |
| density | optional | Density of sample (Units: g/m3) | |
| project name | mandatory | Name of the project within which the sequencing was organized | |
| ploidy | optional | The ploidy level of the genome (e.g. allopolyploid, haploid, diploid, triploid, tetraploid). it has implications for the downstream study of duplicated gene and regions of the genomes (and perhaps for difficulties in assembly). for terms, please select terms listed under class ploidy (pato:001374) of phenotypic quality ontology (pato), and for a browser of pato (v 2018-03-27) please refer to http://purl.bioontology.org/ontology/pato | |
| number of replicons | optional | Reports the number of replicons in a nuclear genome of eukaryotes, in the genome of a bacterium or archaea or the number of segments in a segmented virus. always applied to the haploid chromosome count of a eukaryote. mandatory for migs of eukaryotes, bacteria, archaea and segmented virus. | |
| extrachromosomal elements | optional | Do plasmids exist of significant phenotypic consequence (e.g. ones that determine virulence or antibiotic resistance). megaplasmids? other plasmids (borrelia has 15+ plasmids). | |
| estimated size | optional | The estimated size of the genome (in bp) prior to sequencing. of particular importance in the sequencing of (eukaryotic) genome which could remain in draft form for a long or unspecified period. mandatory for migs of eukaryotes. | |
| target gene | optional | Targeted gene or locus name for marker gene studies | |
| target subfragment | optional | Name of subfragment of a gene or locus. important to e.g. identify special regions on marker genes like v6 on 16s rrna | |
| multiplex identifiers | optional | Molecular barcodes, called multiplex identifiers (mids), that are used to specifically tag unique samples in a sequencing run. sequence should be reported in uppercase letters | |
| sequence quality check | optional | Indicate if the sequence has been called by automatic systems (none) or undergone a manual editing procedure (e.g. by inspecting the raw data or chromatograms). applied only for sequences that are not submitted to sra or dra | manual, none, software |
| chimera check software | optional | Tool(s) used for chimera checking, including version number and parameters, to discover and remove chimeric sequences. a chimeric sequence is comprised of two or more phylogenetically distinct parent sequences. | |
| relevant electronic resources | optional | A related resource that is referenced, cited, or otherwise associated to the sequence in the format of a pmid, doi or url | |
| relevant standard operating procedures | optional | Standard operating procedures used in assembly and/or annotation of genomes, metagenomes or environmental sequences in the format of a pmid, doi or url | |
| collection date | mandatory | The date the sample was collected with the intention of sequencing, either as an instance (single point in time) or interval. in case no exact time is available, the date/time can be right truncated i.e. all of these are valid iso8601 compliant times: 2008-01-23t19:23:10+00:00; 2008-01-23t19:23:10; 2008-01-23; 2008-01; 2008. | |
| altitude | optional | The altitude of the sample is the vertical distance between earth's surface above sea level and the sampled position in the air. (Units: m) | |
| geographic location (latitude) | mandatory | The geographical origin of the sample as defined by latitude. the values should be reported in decimal degrees and in wgs84 system (Units: DD) | |
| geographic location (longitude) | mandatory | The geographical origin of the sample as defined by longitude. the values should be reported in decimal degrees and in wgs84 system (Units: DD) | |
| geographic location (region and locality) | optional | The geographical origin of the sample as defined by the specific region name followed by the locality name. | |
| broad-scale environmental context | mandatory | Report the major environmental system the sample or specimen came from. the system(s) identified should have a coarse spatial grain, to provide the general environmental context of where the sampling was done (e.g. in the desert or a rainforest). we recommend using subclasses of envo’s biome class: http://purl.obolibrary.org/obo/envo_00000428. envo documentation about how to use the field: https://github.com/environmentontology/envo/wiki/using-envo-with-mixs. | |
| local environmental context | mandatory | Report the entity or entities which are in the sample or specimen’s local vicinity and which you believe have significant causal influences on your sample or specimen. we recommend using envo terms which are of smaller spatial grain than your entry for "broad-scale environmental context". terms, such as anatomical sites, from other obo library ontologies which interoperate with envo (e.g. uberon) are accepted in this field. envo documentation about how to use the field: https://github.com/environmentontology/envo/wiki/using-envo-with-mixs. | |
| environmental medium | mandatory | Report the environmental material(s) immediately surrounding the sample or specimen at the time of sampling. we recommend using subclasses of 'environmental material' (http://purl.obolibrary.org/obo/envo_00010483). envo documentation about how to use the field: https://github.com/environmentontology/envo/wiki/using-envo-with-mixs . terms from other obo ontologies are permissible as long as they reference mass/volume nouns (e.g. air, water, blood) and not discrete, countable entities (e.g. a tree, a leaf, a table top). | |
| elevation | optional | The elevation of the sampling site as measured by the vertical distance from mean sea level. (Units: m) | |
| amount or size of sample collected | optional | The total amount or size (volume (ml), mass (g) or area (m2) ) of sample collected. (Units: m3) | |
| biomass | optional | Amount of biomass; should include the name for the part of biomass measured, e.g. microbial, total. can include multiple measurements (Units: t) | |
| organism count | optional | Total cell count of any organism (or group of organisms) per gram, volume or area of sample, should include name of organism followed by count. the method that was used for the enumeration (e.g. qpcr, atp, mpn, etc.) should also be provided. (example: total prokaryotes; 3.5e7 cells per ml; qpcr) | |
| sample storage duration | optional | Duration for which the sample was stored. indicate the duration for which the sample was stored written in iso 8601 format. | |
| geographic location (country and/or sea) | mandatory | The geographical origin of where the sample was collected from, with the intention of sequencing, as defined by the country or sea name. country or sea names should be chosen from the insdc country list (http://insdc.org/country.html). | Afghanistan, Albania, Algeria, American Samoa, Andorra, Angola, Anguilla, Antarctica, Antigua and Barbuda, Arctic Ocean, Argentina, Armenia, Aruba, Ashmore and Cartier Islands, Atlantic Ocean, Australia, Austria, Azerbaijan, Bahamas, Bahrain, Baker Island, Baltic Sea, Bangladesh, Barbados, Bassas da India, Belarus, Belgium, Belize, Benin, Bermuda, Bhutan, Bolivia, Borneo, Bosnia and Herzegovina, Botswana, Bouvet Island, Brazil, British Virgin Islands, Brunei, Bulgaria, Burkina Faso, Burundi, Cambodia, Cameroon, Canada, Cape Verde, Cayman Islands, Central African Republic, Chad, Chile, China, Christmas Island, Clipperton Island, Cocos Islands, Colombia, Comoros, Cook Islands, Coral Sea Islands, Costa Rica, Cote d'Ivoire, Croatia, Cuba, Curacao, Cyprus, Czechia, Czech Republic, Democratic Republic of the Congo, Denmark, Djibouti, Dominica, Dominican Republic, East Timor, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Estonia, Ethiopia, Europa Island, Falkland Islands (Islas Malvinas), Faroe Islands, Fiji, Finland, France, French Guiana, French Polynesia, French Southern and Antarctic Lands, Gabon, Gambia, Gaza Strip, Georgia, Germany, Ghana, Gibraltar, Glorioso Islands, Greece, Greenland, Grenada, Guadeloupe, Guam, Guatemala, Guernsey, Guinea, Guinea-Bissau, Guyana, Haiti, Heard Island and McDonald Islands, Honduras, Hong Kong, Howland Island, Hungary, Iceland, India, Indian Ocean, Indonesia, Iran, Iraq, Ireland, Isle of Man, Israel, Italy, Jamaica, Jan Mayen, Japan, Jarvis Island, Jersey, Johnston Atoll, Jordan, Juan de Nova Island, Kazakhstan, Kenya, Kerguelen Archipelago, Kingman Reef, Kiribati, Kosovo, Kuwait, Kyrgyzstan, Laos, Latvia, Lebanon, Lesotho, Liberia, Libya, Liechtenstein, Lithuania, Luxembourg, Macau, Macedonia, Madagascar, Malawi, Malaysia, Maldives, Mali, Malta, Marshall Islands, Martinique, Mauritania, Mauritius, Mayotte, Mediterranean Sea, Mexico, Micronesia, Midway Islands, Moldova, Monaco, Mongolia, Montenegro, Montserrat, Morocco, Mozambique, Myanmar, Namibia, Nauru, Navassa Island, Nepal, Netherlands, New Caledonia, New Zealand, Nicaragua, Niger, Nigeria, Niue, Norfolk Island, North Korea, North Sea, Northern Mariana Islands, Norway, Oman, Pacific Ocean, Pakistan, Palau, Palmyra Atoll, Panama, Papua New Guinea, Paracel Islands, Paraguay, Peru, Philippines, Pitcairn Islands, Poland, Portugal, Puerto Rico, Qatar, Republic of the Congo, Reunion, Romania, Ross Sea, Russia, Rwanda, Saint Helena, Saint Kitts and Nevis, Saint Lucia, Saint Pierre and Miquelon, Saint Vincent and the Grenadines, Samoa, San Marino, Sao Tome and Principe, Saudi Arabia, Senegal, Serbia, Seychelles, Sierra Leone, Singapore, Sint Maarten, Slovakia, Slovenia, Solomon Islands, Somalia, South Africa, South Georgia and the South Sandwich Islands, South Korea, Southern Ocean, Spain, Spratly Islands, Sri Lanka, Sudan, Suriname, Svalbard, Swaziland, Sweden, Switzerland, Syria, Taiwan, Tajikistan, Tanzania, Tasman Sea, Thailand, Togo, Tokelau, Tonga, Trinidad and Tobago, Tromelin Island, Tunisia, Turkey, Turkmenistan, Turks and Caicos Islands, Tuvalu, USA, Uganda, Ukraine, United Arab Emirates, United Kingdom, Uruguay, Uzbekistan, Vanuatu, Venezuela, Viet Nam, Virgin Islands, Wake Island, Wallis and Futuna, West Bank, Western Sahara, Yemen, Zambia, Zimbabwe, missing, missing: control sample, missing: data agreement established pre-2023, missing: endangered species, missing: human-identifiable, missing: lab stock, missing: sample group, missing: synthetic construct, missing: third party data, not applicable, not collected, not provided, restricted access |
| host disease status | optional | List of diseases with which the host has been diagnosed; can include multiple diagnoses. the value of the field depends on host; for humans the terms should be chosen from do (disease ontology) at http://www.disease-ontology.org, other hosts are free text | |
| host scientific name | optional | Scientific name of the natural (as opposed to laboratory) host to the organism from which sample was obtained. | |
| atmospheric data | optional | Measurement of atmospheric data; can include multiple data | |
| conductivity | optional | Electrical conductivity of water (Units: mS/cm) | |
| water current | optional | Measurement of magnitude and direction of flow within a fluid (Units: m3/s) | |
| fluorescence | optional | Raw (volts) or converted (mg chla/m^3) fluorescence of the water (Units: mg Chla/m3) | |
| light intensity | optional | Measurement of light intensity (Units: lux) | |
| mean friction velocity | optional | Measurement of mean friction velocity (Units: m/s) | |
| mean peak friction velocity | optional | Measurement of mean peak friction velocity (Units: m/s) | |
| downward PAR | optional | Visible waveband radiance and irradiance measurements in the water column (Units: µE/m2/s) | |
| photon flux | optional | Measurement of photon flux (Units: µmol/m2/s) | |
| pressure | optional | Pressure to which the sample is subject, in atmospheres (Units: bar) | |
| temperature | optional | Temperature of the sample at time of sampling (Units: ºC) | |
| tidal stage | optional | Stage of tide | high, low |
| turbidity | optional | Turbidity measurement (Units: NTU) | |
| pH | optional | Ph measurement | |
| total depth of water column | optional | Measurement of total depth of water column (Units: m) | |
| alkyl diethers | optional | Concentration of alkyl diethers (Units: µg/L) | |
| aminopeptidase activity | optional | Measurement of aminopeptidase activity (Units: mol/L/h) | |
| ammonium | optional | Concentration of ammonium (Units: µmol/L) | |
| bacterial carbon production | optional | Measurement of bacterial carbon production (Units: ng/h) | |
| bacterial production | optional | Bacterial production in the water column measured by isotope uptake (Units: mg/m3/d) | |
| bacterial respiration | optional | Measurement of bacterial respiration in the water column (Units: mg/m3/d) | |
| bishomohopanol | optional | Concentration of bishomohopanol (Units: µg/g) | |
| bromide | optional | Concentration of bromide (Units: µmol/L) | |
| calcium | optional | Concentration of calcium (Units: µmol/L) | |
| carbon/nitrogen ratio | optional | Ratio of amount or concentrations of carbon to nitrogen | |
| chloride | optional | Concentration of chloride (Units: mg/L) | |
| chlorophyll | optional | Concentration of chlorophyll (Units: µg/L) | |
| diether lipids | optional | Concentration of diether lipids; can include multiple types of diether lipids (Units: ng/L) | |
| dissolved carbon dioxide | optional | Concentration of dissolved carbon dioxide (Units: µmol/L) | |
| dissolved hydrogen | optional | Concentration of dissolved hydrogen (Units: µmol/L) | |
| dissolved inorganic carbon | optional | Dissolved inorganic carbon concentration (Units: µg/L) | |
| dissolved inorganic nitrogen | optional | Concentration of dissolved inorganic nitrogen (Units: µg/L) | |
| dissolved inorganic phosphorus | optional | Concentration of dissolved inorganic phosphorus (Units: µg/L) | |
| dissolved organic carbon | optional | Concentration of dissolved organic carbon (Units: µmol/L) | |
| dissolved organic nitrogen | optional | Dissolved organic nitrogen concentration measured as; total dissolved nitrogen - nh4 - no3 - no2 (Units: µg/L) | |
| dissolved oxygen | optional | Concentration of dissolved oxygen (Units: µmol/kg) | |
| glucosidase activity | optional | Measurement of glucosidase activity (Units: mol/L/h) | |
| magnesium | optional | Concentration of magnesium (Units: parts/million) | |
| n-alkanes | optional | Concentration of n-alkanes; can include multiple n-alkanes (Units: µmol/L) | |
| nitrate | optional | Concentration of nitrate (Units: µmol/L) | |
| nitrite | optional | Concentration of nitrite (Units: µmol/L) | |
| total nitrogen concentration | optional | Concentration of nitrogen (total). total nitrogen concentration of water samples, calculated by: total nitrogen = total dissolved nitrogen + particulate nitrogen. can also be measured without filtering, reported as nitrogen (Units: µmol/L) | |
| organic carbon | optional | Concentration of organic carbon (Units: µmol/L) | |
| organic matter | optional | Concentration of organic matter (Units: µg/L) | |
| organic nitrogen | optional | Concentration of organic nitrogen (Units: µg/L) | |
| particulate organic carbon | optional | Concentration of particulate organic carbon (Units: µg/L) | |
| particulate organic nitrogen | optional | Concentration of particulate organic nitrogen (Units: µg/L) | |
| petroleum hydrocarbon | optional | Concentration of petroleum hydrocarbon (Units: µmol/L) | |
| phaeopigments | optional | Concentration of phaeopigments; can include multiple phaeopigments (Units: µg/L) | |
| phosphate | optional | Concentration of phosphate (Units: µmol/L) | |
| phospholipid fatty acid | optional | Concentration of phospholipid fatty acids; can include multiple values (Units: mol/g) | |
| potassium | optional | Concentration of potassium (Units: µmol/L) | |
| primary production | optional | Measurement of primary production (Units: mg/m3/day) | |
| redox potential | optional | Redox potential, measured relative to a hydrogen cell, indicating oxidation or reduction potential (Units: mV) | |
| salinity | optional | The total concentration of all dissolved salts in a liquid or solid sample. while salinity can be measured by a complete chemical analysis, this method is difficult and time consuming. more often, it is instead derived from the conductivity measurement. this is known as practical salinity. these derivations compare the specific conductance of the sample to a salinity standard such as seawater. (Units: psu) | |
| silicate | optional | Concentration of silicate (Units: µmol/L) | |
| sodium | optional | Sodium concentration (Units: µmol/L) |