Spectrophotometric Study on the Color Reaction of Silver(Ⅰ) with meso-Tetra (4-sulphophenyl) porphyrin

Abstract

Abstract: Ahighly sensitive spectrophotometric method has been developed for the determination of trace silver, based on the color reaction of silver(Ⅰ) with meso-tetra(4-sulphophenyl) porphyrin (TPPS₄) in the presence of cetyltrimethylammonium bromide (CTMAB) and β-cy-clodextrin(β-CD).The silver(Ⅰ) complex formed is sensitive, stable, and remained unchanged in strong acid medium.The apparent molar absorptivity of the complex is 5.21 × 10⁵ L/mol · cm at 424 nm.The composition ratio of the complex was determined to be 1:1:2(Ag:TPPS₄:CTMAB) by both the continuous variation method and the molar ratio method.Beer's Law is obeyed for silver in the range of 0-8 μg/25 mL.The interference of foreign ions was also examined.The method can be used for the determination of silver in the fixer waste water, photographic paper and ores, and the results are the same as those of AAS.

Key words: Porphyrin, Silver, Spectrophotometry, Cyclodextrin

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PAN Zu-Ting, ZHAO Ye, JIN Zhen-Shu, WANG Ming-Zhi, XU Mian-Yi . Spectrophotometric Study on the Color Reaction of Silver(Ⅰ) with meso-Tetra (4-sulphophenyl) porphyrin[J]. Chem. J. Chinese Universities, 1993, 14(12): 1671.

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Spectrophotometric Study on the Color Reaction of Silver(Ⅰ) with meso-Tetra (4-sulphophenyl) porphyrin

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