{ "currentVersion": 10.91, "id": 129, "name": "sagk_purosedimentti", "type": "Feature Layer", "description": "Suuralueellinen purosedimenttigeokemiallinen kartoitusaineisto kuvaa pienten latvapurojen orgaanisen purosedimentin alkuaineiden pitoisuuksia. Näytteet on otettu pienistä latvapuroista (valuma-alue alle 30 km2) loppukesällä 1990. Näytteenotto on toistettu noin joka neljännessä pisteessä vuosina 1995, 2000 ja 2006. Näytemäärät olivat vuonna 1990 1162 (tiheys 1 näyte / 300 km2), vuonna 1995 286, vuonna 2000 286 ja vuonna 2006 249 kappaletta. Aineisto kattaa koko Suomen. Samaan aikaan on otettu myös purovesinäytteitä.\nNäytteiden otto, käsittely ja analytiikka on kuvattu Suomen geokemian atlaksen 3. osan (Lahermo ym. 1996) sivuilla 27-30. Kenttähavainnot, koordinaatit ja näytteestä määritetyt alkuainepitoisuudet on yhdistetty tietokannaksi, jonka kukin tietue kuvaa yhtä näytepistettä. Kunkin näytteenottovuoden tiedot on talletettu eri tauluihin. Analyysimenetelmään viitataan nelimerkkisellä menetelmäkoodilla. Koodit ovat seuraavat:\n503H = elohopeamääritys kylmähöyrymenetelmällä\n503P = uutto typpihappouutolla mikroaaltouunissa, mittaus ICP-AES:llä\n503M = uutto typpihappouutolla mikroaaltouunissa, mittaus ICP-MS:llä\n820L = hiili, vety ja typpi LECO-analysaattorilla\nAlkuainepitoisuustietoon kuuluu numeerinen pitoisuusarvo yksikössä mg/kg (eli ppm) ja mahdollinen tarkistusmerkki. Pitoisuus on talletettu muuttujaan, jonka nimi koostuu alkuaineen kemiallisesta merkistä ja analyysimenetelmän koodista. Esimerkiksi AS_503M on arseenin (As) pitoisuus, joka on määritetty ICP-MS-menetelmällä (503M). Sitä seuraava muuttuja on tarkis-tusmerkki, esimerkiksi AS_503MT. Jos lukuarvoa seuraava tarkistusmerkki on \u2019>\u2019 tai \u2019<\u2019, niin pitoisuuskenttään talletettu lukuarvo on kemiallisen analyysimenetelmän määritysraja ja todellinen pitoisuus on tätä arvoa pienempi. Jos tarkistusmerkki on huutomerkki (!), analyysitulos on pienempi kuin analyysimenetelmän määritysraja, mutta tietokantaan on talletettu mittauslaitteen (epäluotettava) mittaustulos. 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