{ "currentVersion": 10.91, "id": 128, "name": "sagk_purovesi", "type": "Feature Layer", "description": "Suuralueellinen purovesigeokemiallinen kartoitusaineisto kuvaa pienten latvapurojen veden fysikaalisia ominaisuuksia ja 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. \nNäytteiden otto, käsittely ja analytiikka on kuvattu Suomen geokemian atlaksen 3. osan (Lahermo ym. 1996) sivuilla 27 - 30. Kenttähavainnot, koordinaatit ja vesinäytteestä määritetyt fysikaaliset ominaisuudet ja alkuainepitoisuudet on yhdistetty tietokannaksi, jonka kukin tietue kuvaa yhtä näytepistettä. Kunkin näytteenottovuoden tiedot on talletettu eri tauluihin. Analyysimenetelmään viitataan nelimerkkisellä menetelmäkoodilla. Koodit ovat seuraavat:\n143I = pH:n tai sähkönjohtavuuden määritys potentiometrisesti\n143R = anionien määritys ionikromatografilla\n143C = fosfaatin määritys spektorfotometrisesti\n140M = liuenneiden alkuaineiden määritys vesinäytteestä ICP-MS-menetelmällä\n140P = liuenneiden alkuaineiden määritys vesinäytteestä ICP-AES-menetelmällä\nAlkuainepitoisuustietoon kuuluu numeerinen pitoisuusarvo yksikössä mg/L (eli ppm) tai µg/L (eli ppb) ja mahdollinen tarkistusmerkki. Sähkönjohtavuuden yksikkö on mS/m (25oC). Alkaliteetin yksikkö on mmol/L. Väriluvun yksikkö on mg Pt/L. KMnO4-luvun yksikkö on mg/L. Pitoisuus on talletettu muuttujaan, jonka nimi koostuu alkuaineen kemiallisesta merkistä ja ana-lyysimenetelmän koodista sekä yksikkö ppm tai ppb. Esimerkiksi AS_140M_PPB on arseenin (As) pitoisuus, joka on määritetty ICP-MS-menetelmällä (140M) ja talletettu yksikössä µg/L eli ppb. Sitä seuraava muuttuja on tarkistusmerkki, esimerkiksi AS_140MT. Jos lukuarvoa seuraava tarkistusmerkki on \u2019>\u2019 tai \u2019<\u2019, niin pitoisuuskenttään talletettu lukuarvo on kemiallisen ana-lyysimenetelmän 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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