2026-03-05T21:16:09Z https://kindai.repo.nii.ac.jp/oai

oai:kindai.repo.nii.ac.jp:00011196 2023-06-20T20:47:38Z 14:923:2091:2135 21:3039:3558:3572

2,5-ビス-(2-ピコリルアミノ)-1,4-ベンゾキノンを用いるコバルト(II)の吸光光度定量 Spectrophotometric Determination of Cobalt (II) with 2,5-Bis-(2-picolylamino)-1,4-benzoquinone 加藤, 武 カトウ, タカシ 中山, 達郎 ナカヤマ, タツロウ spectrophotometry determination of cobalt(II) 2,5-bis-(2-picolylamino)-1 4-benzoquinone A new spectrophotometric method for the determination of cobalt(II) with 2,5-bis-(2-picolylamino)-1,4-benzoquinone (PABQ) in the presence of sodium L-ascorbate is proposed. PABQ is prepared by refluxing a 1 : 2 mixture of 1,4-benzoquinone and 2-aminomethylpyridine in ethanol. PABQ reacts with cobalt(II) to form a water soluble complex which has an absorption maximum at 560 nm. The calibration curve obeys Beer's law over the concentration range from 0.1 to 2μg/ml of cobalt(II). The apparent molar absorption coefficient is 3.7×10^4dm^3 mol^<-1>cm^<-1>. The recommended procedure is as follows; To a sample solution, 1 ml of 10% sodium L-ascorbate and 5 ml of 10^<-3>M PABQ methanol solution is added, pH is adjusted to 6.5〜7.5 with ammonium acetate solution, and the solution is made up to 50 ml with water. After standing the solution for 15〜20 min, the absorbance is measured at 560 nm against reagent blank. application/pdf 近畿大学理工学総合研究所 1989-01-01 jpn departmental bulletin paper VoR https://kindai.repo.nii.ac.jp/records/11196 09162054 理工学総合研究所研究報告 Annual reports by Research Institute for Science and Technology 1 15 19 https://kindai.repo.nii.ac.jp/record/11196/files/AN10074306-19890100-0015.pdf application/pdf 253.3 kB 2016-02-19