Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Koichi Katoh,Fractional Determination of Iron(2) Sulfide and Iron oxides in Sediment Samples by Leaching Method with Hydrochloric Acid Solutions,新潟大学工学部研究報告,03744345,新潟 : 新潟大学工学部,1988,,37,p37-43,https://cir.nii.ac.jp/crid/1520009410215366400,