{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1390282680057735936.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.2965/jswe.27.423"}},{"identifier":{"@type":"COI","@value":"1:CAS:528:DC%2BD2cXntVymsb4%3D"}},{"identifier":{"@type":"NDL_BIB_ID","@value":"6986413"}},{"identifier":{"@type":"URI","@value":"http://id.ndl.go.jp/bib/6986413"}},{"identifier":{"@type":"URI","@value":"https://ndlsearch.ndl.go.jp/books/R000000004-I6986413"}},{"identifier":{"@type":"URI","@value":"https://www.jstage.jst.go.jp/article/jswe/27/6/27_6_423/_pdf"}},{"identifier":{"@type":"NAID","@value":"10013080190"}},{"identifier":{"@type":"NAID","@value":"10020359925"}}],"dc:title":[{"@language":"en","@value":"Estimation of Long-Term Changes in Cr (VI) Concentration in Public Water after Countermeasures against Water Pollution"},{"@language":"ja","@value":"汚染対策後の公共用水域等における六価クロム濃度の長期変動評価"},{"@language":"ja-Kana","@value":"オセン タイサク ゴ ノ コウキョウヨウ スイイキ トウ ニ オケル 6カ クロム ノウド ノ チョウキ ヘンドウ ヒョウカ"}],"dc:language":"ja","description":[{"type":"abstract","notation":[{"@language":"en","@value":"In Kuriyama Town, Hokkaido, slags that contained a high concentration of hexavalent chromium(Cr(VI))from a chromium factory was disposed in landfills, both inside and outside the town. Because leachate from landfills was caused environmental problems, we have carried out water quality surveys twice at the rivers and wastewater pipes of Kuriyama Town in 1971. It was found that although many sites had no concentration or relatively low concentration of Cr(VI), the rest of the sites had a high concentration of Cr(VI). The Cr(VI) concentration was lowered because the large-scale landfills were covered with a reducing substance, asphalt, and the small-scale landfills, which were used by households, was managed according to sewage guidelines. The ratio of Cr(VI) found in total Cr varied at different locations depending on whether a reducing substance was present or not. In most cases, Cr(VI) in the rivers was not detected when irrigation water flowed into the river. The Cr(VI) volume discharged from the Tagami landfill was calculated to be approximately 82ton and 27% of content Cr(VI). If other landfills were included, it was estimated that water-discharged Cr(VI) could be more than 100t."}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410009222250713216","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000322678505"},{"@type":"NRID","@value":"9000408430773"},{"@type":"NRID","@value":"9000363172687"},{"@type":"NRID","@value":"9000410349426"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0159356"}],"foaf:name":[{"@language":"en","@value":"ISHIKAWA Yasushi"},{"@language":"ja","@value":"石川 靖"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Hokkaido Institute of Environmental Sciences"},{"@language":"ja","@value":"北海道環境科学研究センター"}]},{"@id":"https://cir.nii.ac.jp/crid/1410009222250713217","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000001254140"}],"foaf:name":[{"@language":"en","@value":"SAITOH Osamu"},{"@language":"ja","@value":"斉藤 修"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Hokkaido Institute of Environmental Sciences"},{"@language":"ja","@value":"北海道環境科学研究センター"}]},{"@id":"https://cir.nii.ac.jp/crid/1410009222250713218","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000000680445"}],"foaf:name":[{"@language":"en","@value":"NUMABE Akihiro"},{"@language":"ja","@value":"沼辺 明博"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Hokkaido Institute of Environmental Sciences"},{"@language":"ja","@value":"北海道環境科学研究センター"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"09168958"},{"@type":"EISSN","@value":"18813690"},{"@type":"NDL_BIB_ID","@value":"000000082150"},{"@type":"ISSN","@value":"09168958"},{"@type":"LISSN","@value":"09168958"},{"@type":"NCID","@value":"AN10372439"}],"prism:publicationName":[{"@language":"en","@value":"Journal of Japan Society on Water Environment"},{"@language":"ja","@value":"水環境学会誌"},{"@language":"en","@value":"Mizu Kankyo Gakkaishi"},{"@language":"en","@value":"Journal of Japan Society on Water Environment"},{"@language":"ja","@value":"水環境学会誌"}],"dc:publisher":[{"@language":"en","@value":"Japan Society on Water Environment"},{"@language":"ja","@value":"公益社団法人 日本水環境学会"}],"prism:publicationDate":"2004","prism:volume":"27","prism:number":"6","prism:startingPage":"423","prism:endingPage":"429"},"reviewed":"false","url":[{"@id":"http://id.ndl.go.jp/bib/6986413"},{"@id":"https://ndlsearch.ndl.go.jp/books/R000000004-I6986413"},{"@id":"https://www.jstage.jst.go.jp/article/jswe/27/6/27_6_423/_pdf"}],"availableAt":"2004","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=Cr(VI)%20concentration","dc:title":"Cr(VI) concentration"},{"@id":"https://cir.nii.ac.jp/all?q=landfill","dc:title":"landfill"},{"@id":"https://cir.nii.ac.jp/all?q=long-term%20changes","dc:title":"long-term changes"},{"@id":"https://cir.nii.ac.jp/all?q=Cr(VI)%20volume","dc:title":"Cr(VI) volume"}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360292621511460608","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Ductile-brittle transition in metallic glasses"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137045638668544","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Identification of λ Bootis Stars Using IUE Spectra"}]},{"@id":"https://cir.nii.ac.jp/crid/1362544418987870592","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"hierarchy"}]},{"@id":"https://cir.nii.ac.jp/crid/1363388844676014976","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Stratosphärische Ozonschicht mit Laser überwacht"}]},{"@id":"https://cir.nii.ac.jp/crid/1363388846225049472","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"IN 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