巻号一覧
25 巻 (1985)
- 4 号 p. 139-
- 3 号 p. 101-
- 2 号 p. 53-
- 1 号 p. 1-
25 巻, 4 号
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非晶質鉱物の同定と定量への応用児玉 秀臣, 林 久人1985 年 25 巻 4 号 p. 139-147
発行日: 1985/12/13
公開日: 2011/09/20
ジャーナル フリーA comparative study was conducted to evaluate chemical dissolution techniques for separating non-crystalline components from minerals. The techniques examined included six separate treatments with NaOH, Na2CO3, alkaline Tiron, dithionite-citrate-bicarbonate (DCB), acid ammonium oxalate and sodium pyrophosphate. These dissolution techniques were applied to compositionally different non-crystalline silicates, fractionated samples of goethite, hematite and gibbsite, and synthetic crystalline and non-crystalline iron (or aluminum) oxyhydroxide minerals. Their efficiency and specificity were discussed on the basis of the results obtained.
The extraction capacity changed with not only the type of dissolution techniques but also the composition of non-crystalline components to be dissolved. For a composition of Si-Al system, the NaOH, Na2CO3 and Tiron methods indicated little selectivity with regard to the two elements. For a Si-Al-Fe-Mg system composition, however, the NaOH and Na2CO3 methods extracted preferentially Si and Al. As anticipated, a strong selectivity for Fe was always observed with the DCB method. The Tiron method showed the least selective extractions of these elements among the methods examined. For Fe-oxides, Fe-oxyhydroxides, Al-oxyhydroxides and Al hydroxides, the Tiron method extracted as much Fe and Al from respective minerals as the oxalate method did except for a few abnormal cases. As particlesizes of hematite, goethite and gibbsite decreased, amounts of extractable Fe and Al increased. This should be borne in mind when extraction techniques are applied to samples containing fine crystalline particles. Although the chemical dissolution techniques are conventional and operational, they can be very useful. If techniques are appropriately chosen depending on the case and the resulting extraction data are then carefully interpreted, unique information concerning non-crystalline components should be available.抄録全体を表示PDF形式でダウンロード (1074K) -
藤井 知, 覚野 宏, 杉江 他曽宏, 坂本 千秋1985 年 25 巻 4 号 p. 148-152
発行日: 1985/12/13
公開日: 2011/09/20
ジャーナル フリーAdsorption properties of thermal-treated chrysotile asbestos were studied by measuring the specific surface area, the adsorpabilities for water and coloring matters (Methylene Blue and Acid Red 88), and the uptakabilities for some metal ions (Cu2+, Co2+, and Ni2+) in a batch system with each aqueous solution in addition to differential thermal analysis (DTA), thermogravimetry (TG), and X-ray powder diffraction (XRD) examination.
The layer structure of chrysotile used collapsed at 500°C and was transformed to forsterite above 600°C. The material heated at 600°C yielded the maximum specific surface area and increased the adsorpability for Methylene Blue, whereas decreased for Acid Red 88. The materials heated at 500°C and 600°C exhibitid considerably great uptakabilities for metal ions because of the appearance of active MgO sites on the chrysotile surface by the thermal treatments. In particular, the thermal-treated chrysotile asbestos seems to exhibit a significant power for the removal of Co2+ from aqueous solutions.抄録全体を表示PDF形式でダウンロード (536K) -
西川 裕二, 坂本 尚史, 福原 実, 土井 章, 加計 勉1985 年 25 巻 4 号 p. 153-161
発行日: 1985/12/13
公開日: 2011/09/20
ジャーナル フリーThe reactivity and thermal properties of two simple water-soluble mesosubstituted porphyrins, TPPS and TMPyP, in the interlayer space of montmorillonite were studied.
Positively charged TMPyP was rapidly adsorbed by montmorillonite, whereas, almost no negatively charged TPPS was adsorbed. The amount of TMPyP adsorbed on Cu-, Co-, Ni-, and H-montmorillonite was much greater than that on Namontmorillonite. Adsorbed TMPyP molecule was mainly metallated in the interlayer space of Cu-montmorillonite but was protonated in Co-, Ni-and H-montmorillonite. When montmorillonite-TMPyP complex was heated in air, adsorbed TMPyP decomposed in two steps. First mesosubstituents decomposed and then the tetrapyrrolic ring was eliminated.抄録全体を表示PDF形式でダウンロード (935K)
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