摘要:

A simple, rapid and sensitive catalytic kinetic method was used for the determination of trace amounts of sulfide based on its catalytic reduction of Methylene Blue(MB) in the presence of Te(IV). The reaction was monitored spectrophotometrically by measuring the change in absorbance of the reaction mixture at 663 nm. The fixed time method was used for the first 1.5 minute from initiation of reaction. Under the optimum conditions, in the concentration range of 0.05–2 μg/ml of sulfide ion, a linear curve (r = 0.998) was obtained. The detection limit is 0.025 μg/ml. The relative standard deviation of ten replicate measurements is 2.1% for a 1 μg/ml solution of sulfide. The proposed method was applied for the determination of sulfide in spring and waste water.

ISSN:0003-2719    

DOI:10.1080/00032719708001676

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The cationic mercury(II)-1,10-phenanthroline binary chelate reacts with the acidic dye Thymol Blue (TB), in the pH range 5.2–7.0, to form an ion-pair extractable into chloroform. The effect of primary ligand and counter ion concentrations, pH, extraction solvent, extractability, standing time and co-existing ions has been thoroughly investigated. The molar absorptivity of the ion-pair, in chloroform, is 1.27×105l.mol−1.cm−1at 420 nm. The calibration graph is rectilinear for 0.09–1.72 μg ml−1of mercury. The sensitivity index of the method is 0.0002 μg Hg.cm2–and the detection limit is 0.018 μg ml−1of mercury. The stoichiometry of the extracted ion-pair is 1:2:1 (Hg-Phen-TB). The developed method has been successfully used to determine total mercury in soils, waste water and sewage effluents.

ISSN:0003-2719    

DOI:10.1080/00032719708001677

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

ISSN:0003-2719    

DOI:10.1080/00032719708001665

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor