著者

赤岩 英夫 田島 栄作 相沢 省一

出版者

日本地球化学会

雑誌

地球化学 (ISSN:03864073)

巻号頁・発行日

vol.12, no.1, pp.1-4, 1978

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The bromine and iodine contents were determined simultaneously by neutron activation analysis on two boreholes of the Tertiary marine siltstones and marine tuffs collected from Tomioka, southwestern Gunma Prefecture, and the relationship between these elemental contents and the organic carbon content was investigated. The arithmetic means of the bromine and iodine contents of siltstone samples were 1.9ppm and 2.0ppm, respectively. Tuff samples gave averages of 0.69ppm for the bromine content and 0.75ppm for the iodine content. The positive correlations were observed between the halogen contents and the organic carbon content of the sedimentary rocks analyzed. This suggests that the bromine and iodine in the sedimentary rocks originate from marine plants and microorganisms incorporated during sedimentary processes.

著者

相沢 省一 角田 欣一 赤塚 昌義 井上 定夫 赤岩 英夫

出版者

公益社団法人 日本分析化学会

雑誌

分析化学 (ISSN:05251931)

巻号頁・発行日

vol.43, no.11, pp.865-871, 1994-11-05 (Released:2009-05-29)

参考文献数

18

被引用文献数

2 4

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河川に生息するトビケラの幼虫に含まれる重金属元素をAASで定量し,重金属汚染環境指標生物としての同水生昆虫の評価を行う目的で,試料分解法をはじめ個体間の元素含量差,体長と元素含量との関係,季節による元素含量の変動等を検討した.確立した分析法により北関東地方数河川に生息するトビケラ幼虫中の重金属元素を定量した結果,上流域に廃鉱山を持つ渡良瀬川や桐生川では他の河川に比較して銅やマンガン等がトビケラ幼虫に多量に含まれており,同昆虫が重金属汚染環境指標生物として有用であることが明らかとなった.

著者

川本 博 赤岩 英夫

出版者

公益社団法人日本分析化学会

雑誌

分析化学 (ISSN:05251931)

巻号頁・発行日

vol.24, no.2, pp.127-130, 1975-02-10

被引用文献数

2

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Effect of Capriquat (trioctylmethylammonium chloride) on the extract ion of Co(II), Ni(II) and Cu(II) with 2-thenoyltrifluoroacetone (TTA=Htta) was studied. The experimental procedure was as follows: An aqueou ssolution (10.0ml) containing metal ion (M_<2+>) and acetate buffer solution (pH=4.75) was taken in a separatory funnel. An equal volume of the extractant solution which is a mixture of TTA and Capriquat in benzene was added. The mixture was then shaken, and the absorbance of the organic phase was measured. Concentrations of the remainig nickel(II) and cobalt(II) in the aqueous phase were determined by spectrophotometry. Both of the valence-saturated chelate M(tta)_2 and the co-ordination-saturated complex M(tta)_3-could be formed and extracted into benzene in the presence of Capriquat. The extraction of the former chelate was observed to occur in lower concentration region of TTA or Capriquat, and the extraction rates for Co(tta)_2 and Ni(tta)_2 were accelerated by the addition of Capriquat. However, the formation of Co(tta)_3- and Ni(tta)_3 from M(tta)_2 was found to be very slow. In contrast, the rates of extraction for Cu(tta)_2 and Cu(tta)_3- were very high, and the above equilibria were reached within 10 seconds.