カワムラ　クニオ   KAWAMURA Kunio   川村　邦男    所属   広島修道大学  人間環境学部    職種   教授
言語種別	英語
発行・発表の年月	1988/04
形態種別	学術論文
査読	査読有り
標題	Acceleration effect of L-tryptophan on metal ion exchange reaction of cadmium(II) with watersoluble-porphyrin-lead(II) complex and its application to stopped-flow spectrophotpmetryic determination of nM level of cadmium(II)
執筆形態	共著
掲載誌名	Anal. Sci.
掲載区分	国内
巻・号・頁	4(2),pp.175-179
担当範囲	Corresponding anthor
著者・共著者	◎Kunio Kawamura, Shukuro Igarashi, Takao Yotsuyanagi
概要	Acceleration effects of organic ligands for the metal ion exchange reaction of cadmium(ll) with 5,10,15,20-tetrakis- (N-methyl-4-pyridinio )porphinatolead(I I) (Pb(ll)-tmpyp) have been studied. Among 20 kinds of organic ligands, L- tryptophan showed the highest efficiency as an accelerator. In the presence of 2X10-4M of i-tryptophan, Cd(II)-tmpyp complex was formed within 2 s at 20°C, over the pH range of 9.5 -11.5. Based on this finding, a rapid and highly sensitive stopped-flow spectrophotometric method for trace amounts of cadmium(I I) was developed. The apparent molar absorptivity at 448.0 nm was 1.68x 105M-' cm-' and the relative standard deviation was 2.33% for 1.17 μg of cadmium (6 determinations). The determination limitwas at 23.3 ng (4.16x 10.9M) of cadmium-( II). Tolerance limits of 18 kinds of metal ions were discussed.