Complex equilibria and spectrophotometric determination of mercury(II) with Lawsone

Magda S. Saleh; Kamal A. Idriss; Hassan Sedaira; Sherif K. Idriss

doi:10.1007/bf00810855

Complex equilibria and spectrophotometric determination of mercury(II) with Lawsone

Monatshefte für Chemie - Chemical Monthly ◽

10.1007/bf00810855 ◽

1990 ◽

Vol 121 (6-7) ◽

pp. 481-492 ◽

Cited By ~ 3

Author(s):

Magda S. Saleh ◽

Kamal A. Idriss ◽

Hassan Sedaira ◽

Sherif K. Idriss

Keyword(s):

Spectrophotometric Determination ◽

Complex Equilibria

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The reactions of gallium, indium and thallium with 2-(2-pyridylazo)-1-naphthol-4-sulphonic acid and their spectrophotometric determination

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19800054 ◽

1980 ◽

Vol 45 (1) ◽

pp. 54-79 ◽

Cited By ~ 26

Author(s):

Petr Voznica ◽

Josef Havel ◽

Lumír Sommer

Keyword(s):

Reaction Mechanism ◽

Spectrophotometric Determination ◽

Graphical Analysis ◽

Sulphonic Acid ◽

Complete Picture ◽

Optimum Conditions ◽

Complex Equilibria ◽

Absorbance Data

The complex equilibria of gallium, indium and thallium(III) with analytically important 2-(2-pyridylazo)-1-naphthol-4-sulphonate were studied spectrophotometrically using graphical analysis of the absorbance curves and minimization procedures for the absorbance data using the SPEKTFOT program on the Tesla 200 computer. The study yielded a complete picture of the reaction mechanism of these elements with heterocyclic azodyes. Optimum conditions for the spectrophotometric determination of gallium, indium and thallium using this reagent were found.

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Complex equilibria and spectrophotometric determination of copper with 4-(2-pyridylazo)resorcinol and 4-(2-thiazolylazo)resorcinol

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19801502 ◽

1980 ◽

Vol 45 (5) ◽

pp. 1502-1524 ◽

Cited By ~ 15

Author(s):

Aleš Hrdlička ◽

Marie Langová

Keyword(s):

Spectrophotometric Determination ◽

Bathochromic Shift ◽

Graphical Analysis ◽

Alkaline Media ◽

Numerical Treatment ◽

Weakly Alkaline ◽

Complex Equilibria ◽

Absorbance Data ◽

Determination Of Copper

The complex equilibria of copper with 4-(2-pyridylazo)resorcinol and 4-(2-thiazolylazo)resorcinol were studied spectrophotometrically using graphical analysis and numerical treatment of the absorbance data by the PRCEK or SPEKTFOT program on a Tesla 200 computer. Of the two reagents, 4-(2-pyridylazo)resorcinol forms more complexes including the 1 : 2 complexes, with a greater bathochromic shift of λmax with respect to the reagent. Especially the CuL2-2 complex of 4-(2-pyridylazo)resorcinol with ε = 7.9 . 104 at 500 nm permits sensitive spectrophotometric determination of copper. Procedures for the spectrophotometric determination of copper in weakly alkaline media were evaluated.

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