巻号一覧
6 巻, 2 号
選択された号の論文の11件中1～11を表示しています
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山県 登, 武藤 覚, 山県 頴子, 渡辺 定方1957 年 6 巻 2 号 p. 75-77
発行日: 1957/02/05
公開日: 2009/06/30
ジャーナル フリーA Study has been made of the results of systematic analysis of 170 kinds of natural plants, wherein the elementary constituents are divided into three groups : (1) primary elements, composed of K, Na, Ca, Mg, Si, S, and P, each amounting to more than 0.1% of the dry matter; (2) secondary elements, composed of Fe, Al, Mn, Cl, and Zn containing 0.010.1%; and (3) microelements, composed of the rest of the elements containing less than 0.01%. This report deals with the method of decomposition of plant tissues. The nitric acid-perchloric acid method does not cause the loss of phosphorus, but it does cause the loss of sulfur. Accordingly, the most practical method for the systematic analysis of the elements comprising the primary elements group together with Cl is to determine K, Na, Ca, Mg, and P by decomposition with nitric acid-perchloric acid, and then from another sample, to determine S, Si, and Cl by decomposition with sodium carbonate.抄録全体を表示PDF形式でダウンロード (745K) -
掩蔽作用に関する分析化学的研究(第7報)田中 工1957 年 6 巻 2 号 p. 78-80
発行日: 1957/02/05
公開日: 2009/06/30
ジャーナル フリーThe general method of separating and recovering various ions from an alkaline masking solution of sulfosalicylic acid has been investigated. As an example of the application of this method, an analysis of the main constituents of a solution obtained from the process of manufacturing ilmenite and titanium white was attempted, and the results were compared with those using tartaric acid. The results indicated that the method of separation by gradual demasking of the solution of sulfosalicylic acid was easier and quicker than using tartaric acid as a masking agent.抄録全体を表示PDF形式でダウンロード (692K) -
佐藤 寿1957 年 6 巻 2 号 p. 81-85
発行日: 1957/02/05
公開日: 2010/02/16
ジャーナル フリーPolarographic investigations of ambrette musk, ketone musk and xylene musk have been carried out. Each of these compounds showed a clear reducing wave by using 0.25 M NaBr as a supporting electrolyte and 0.04 M Britton-Robinson buffer in 80% alcoholic solution containing 0.028% gelatin. The wave height of these compounds was proportional to the concentration within the concentration range 1.00. 1mM and pH range 2.710.6. The wave heights decreased in the order xylene musk, ambrette musk and ketone musk; and each of the half-wave potentials was shifted to the negative side with an increase in pH. The diffusion coefficient calculated from the Stokes-Einstein equation was applied in the Ilkovic equation to obtain the electron number, from which the mechanism of reduction at the dropping mercury electrode was then deduced. It was found that the quantitative determination of each of these compounds by the polarographic method was possible. The structural formula of ambrette musk was shown to be different from the heretofore accepted one with three nitro groups : it was ascertained to be a formula with two nitro groups.
The Polarographic behavior of piperine has been investigated. A clear reducing wave was indicated by using 0.25 M NaBr as a supporting electrolyte and 0.04 M Britton-Robinson buffer in 80% alcoholic solution containing 0.028% gelatin. Quantitative determination by polarography was possible as the wave heights were proportional within the concentration of 1.00.1 mM and pH range of 2.610.7. The half-wave potentials were shifted toward the negative side with an increase of pH value. Shifting toward the positive side, though slight, was observed with an increase of pH value within the range of 7.010.7. The mechanism of reduction at the dropping mercury electrode was deduced by applying the diffusion coefficient calculated from the Stokes-Einstein equation for determining the electron number in the Ilkovic equation.抄録全体を表示PDF形式でダウンロード (845K) -
田中 信行, 児玉 睦夫, 佐々木 稔, 杉野 美恵子1957 年 6 巻 2 号 p. 86-91
発行日: 1957/02/05
公開日: 2009/06/30
ジャーナル フリーAmperometric titrations of copper (II) and lead (II) have been carried out with ethylenediaminetetraacetate in acetate buffer of pH 4.2 containing 0.01% gelatin, using the dropping mercury electrode as an indicator electrode. Titrations were made at-0.12 volt vs. S. C. E.. for copper (II), and at-0.60 volt vs. S. C. E.. for lead (II). Accurate results were obtained with both elements in the concentration range of 5×10-4 to 1×10-2 mol/l.
Potentiometric titrations at constant current have also been applied to the determination of 5×10-4 to 1×10-2 mol/l. of copper (II) and lead (II) with the same titrants and supporting electrolyte and with the dropping mercury electrode as an indicator electrode. A saturated calomel electrode was used for the reference electrode. As was predicted from the theoretical considerations, potential jumps occurred before the equivalence points in all titrations. The observed deviations were compared with the theoretically calculated deviations. The concentrations of copper (II) and lead (II) initially present in the solution (C in mol/l) can be calculated with the same equation as given in a previ ouspaper,
C=iα-ir/k V+v/V+cv/V,
where c represents the concentration of titrants expressed in mol/l.; V, the initial volume of the solution titrated in ml.; v, the volume in ml.required before the indicator electrode reaches the given potential (-0.12 volt vs. S. C. E.. for copper (II) and-0.60 volt vs. S. C. E.. for lead (II)) ; iα, the applied constant current expressed in microamperes; ir, the residual current in microamperes at the given potential for the observed end point; and k, the sensitivity of the electrode expressed in microampere/mol/l. The results indicate that the potentiometric titration at constant current is applicable with reasonable accuracy to the determination of copper (II) and lead (II) in concentrations down to 5×10-4 mol/l.抄録全体を表示PDF形式でダウンロード (1267K) -
アルカリ土類金属元素の分離に関する研究(第3報)品川 睦明, 村田 寿典, 大石 貞夫1957 年 6 巻 2 号 p. 91-94
発行日: 1957/02/05
公開日: 2009/06/30
ジャーナル フリーThere are many methods for the separation of barium from lead, but the present authors have investigated an electrolytic method for the separation of a small amount of barium in lead. After electrolysis, the barium and lead were determined by the polarographic method. The results are considered to be satisfactory.
In order to separate a small amount of barium in lead by the electrolytic method, the controlled potential and the constant current methods were used. The results indicated that in each method barium remained in the solution within the determination error after lead was separated by approximately 99.799.9%.
The polarographic determination of barium in calcium acetate solution was tried, but it was difficult to measure the diffusion current of barium because of the interference wave at about-1.7V vs. S. C. E.. It was found that the occurrence of the interference wave was caused by the carbon dioxide gas dissolved in the solution. After the carbon dioxide in the calcium acetate solution was removed, the linear relationship between the diffusion current and the concentration of barium was observed.抄録全体を表示PDF形式でダウンロード (873K) -
生物体中の痕跡元素の分析法に関する研究(第11報)山本 勝巳1957 年 6 巻 2 号 p. 94-97
発行日: 1957/02/05
公開日: 2009/06/30
ジャーナル フリー植物体灰分中の銅,亜鉛,およびマンガンの定量にあたり塩酸酸性試料温溶液から同時に存在する鉄およびアルミニウムなどをアンモニア水にてpH約7.4となし沈澱せしめる際これらが担体として作用し銅,亜鉛,およびマンガンを捕集,共沈するのでこれを利用して微量の鋼,亜鉛およびマンガンの定量が可能である.なおその共沈機構は複雑と思われるが鉄含有量が共沈能力にたいして支配的と思われるので,その含有量が少い場合には適当量(1gの灰分を処理したる場合約10mgのFeの添加で十分と考えられる)の添加が望ましい.抄録全体を表示PDF形式でダウンロード (951K) -
イオン交換クロマトグラフィーによるナトリウムとカリウムの分離定量渡辺 定方, 山県 登1957 年 6 巻 2 号 p. 97-99
発行日: 1957/02/05
公開日: 2009/06/30
ジャーナル フリーA separatory determination of sodium and potassium in plant samples has been made by a chromatographic method using ion exchange resin. The sample solution obtained by wet digestion of plant tissues with nitric acid-perchloric acid mixture is passed through a column (diam 1 cm and height 15 cm) of Dowex 50 (X-12) for adsorption of the metal ions. These are liberated by washing with 1.0±0.3 N HCl for a complete recovery of sodium in the first 90 ml effluent and K in the second 180 ml effluent. Each effluent is evaporated to dryness, and heated for 30 minutes at 150°. Water is added, and the solution is titrated with N/50 AgNO3. The required amount of dried plant tissues is 0.51.0 g, or 0.1 g in the case of plant ash; and the time required for analysis is 8 hours. The procedures are very simple and accurate, with less chance for error. The method is more efficient than the gravimetric method, and may be substituted for flame spectrophotometric method.抄録全体を表示PDF形式でダウンロード (656K) -
浅田 照夫1957 年 6 巻 2 号 p. 100-101
発行日: 1957/02/05
公開日: 2009/06/30
ジャーナル フリー近時生体内燐化合物の代謝機構が重要視せられるに従い,組織あるいは体液中の燐の定量操作の精度が問題となってきた.最近の研究によれば従来より燐測定に最もよく用いられ,正確とされている比色法においてもなお多くの不完全な点のあることがわかった.そこで著者は今や多方面に広く応用せられているイオン交換樹脂を用いて燐を定量せんと試み,以下に述べる特殊なイオン交換法(逐次交換法)を案出して,燐のみならず硫酸根をも簡単かつ正確に測定し得たのでここに報告する.抄録全体を表示PDF形式でダウンロード (479K) -
田中 誠之1957 年 6 巻 2 号 p. 101-103
発行日: 1957/02/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (629K) -
萩原 善次1957 年 6 巻 2 号 p. 103-105
発行日: 1957/02/05
公開日: 2010/02/16
ジャーナル フリー燐酸塩類に関する研究に際し,ヘクサウレオクロム(III)錯塩は分析試薬として利用可能なことを述べた.その後前記錯塩がフェロシアン塩の定量剤としても好適であることが認められたので,本報では,これを利用する電流滴定法について報告する.
フェロシアン塩の定量に関しては,次の反応を利用するGalletti-Fahlbergがある.3ZnCl2+2K4Fe(CN)6→K2Zn3[Fe(CN)6]2+6KClこの方法は外部指示薬として酢酸ウラニルを使用しているが,指示薬誤差が大なるため同一条件下で空実験を実施する必要あり,適当な方法とはいえない.上記反応はSpalenka,およびNimerらにより電流滴定法に応用された.すなわち前者は[Fe(CN)6]4-の定量を0.2N HCl酸性で-1.2V(S.C.E.)の加電圧で塩化亜鉛溶液で行った.またアンモニアアルカリ性溶液中で[Fe(CN)6]4-の電流滴定を行っているが再現性に乏しく,更に研究の必要あると述べている.Nimerらはフェロシアン塩による亜鉛の定量を酢酸アンモニア(1.7mol)含有溶液中で-1.4V(S.C.E.)の加電圧で実施しZn2+2～80mgの存在では±5%の誤差内で定量可能なことを指摘した.生成沈殿はZn2Fe(CN)6であり,この溶解度はかなり大なるため電流滴定による終点判定は困難であり,亜鉛量0.2mg以上の存在では再現性誤差は約±3%と述べている.またde HäenらのKMnO4による容量法では試料液が稀く,かつかなりの酸を含むとき[Fe(CN)6]4-の滴定結果は良好であるが,[Fe(CN)6]4-の濃度大になるとK2Mn(Fe(CN)6]2が生成される欠点がある.著者のヘクサウレオクロム(III)錯塩を利用する[Fe(CN)6]4-の直接定量法によれば比較的簡単に後者の定量が可能であり,定量結果は前述の方法に比較して優れている.抄録全体を表示PDF形式でダウンロード (651K) -
山口 悟郎, 宮部 久子1957 年 6 巻 2 号 p. 121-127
発行日: 1957/02/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1976K)
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