attributes.tag: collection_date
attributes.value: 2021-02-01
attributes.tag: env_broad_scale
attributes.value: water
attributes.tag: sample_title
attributes.value: 14mgFe3+ (SAMC5984583)
attributes.tag: env_local_scale
attributes.value: activated sludge
attributes.tag: ngdc_project_id
attributes.value: PRJCA048035
attributes.tag: depth
attributes.value: municipal wastewater
attributes.tag: ngdc_release_date
attributes.value: 2025-10-13
attributes.tag: geo_loc_name
attributes.value: missing: data agreement established pre-2023
attributes.tag: ngdc_sample_id
attributes.value: SAMC5984583
attributes.tag: env_medium
attributes.value: activated sludge
attributes.tag: lat_lon
attributes.value: missing
attributes.tag: sample_name
attributes.value: SAMC5984583_14mgFe3+