New europium complexes of 3-oxo-1-hydroxy-quinoline-2-carboxylic acid amide derivatives (L1-L3), which are highly luminescent and do not require luminescence enhancers are reported. The luminescence intensity of the Eu-L1-3 complexes was enhanced by the addition of citrate ions in water solution. A sensitive luminescence enhancement system was developed for the determination of citrate ions on ...

Colorimetric recognition and sensing of sulfite by melamine-modified gold nanoparticle is reported, using Tris-HCl as the operating buffer. Furthermore, indirect determination of hypochlorite is accomplished by its oxidation of sulfite.

A method is described for the identification of amino acid thiohydantoins by two-dimensional t.l.c. An indirect method for the determination of amino acid thiohydantoins is described which, after hydrolysis, the corresponding amino acids are determined by g.l.c.

Nowadays, Fourier transform infrared (FT-IR) spectrometry (both extractive and open-path techniques) is widely used for the detection of air pollutants because the method is fast, reliable, and nondestructive. It is capable of detecting simultaneously all compounds except non-infrared active homonuclear diatomic molecules. Molecular chlorine gas has many anthropogenic sources, including water t...

1. The kinetics of the reaction between HCHO and I-ascorbic acid or chemically related substances have been studied. 2. Indirect evidence is produced for the possible structure of the HCHO-1-ascorbic acid complex. / 3. Lugg's method for determination of I-ascorbic acid has been examined from the point of view of the above experiments, and necessary precautions are stressed. 4. Suggestions for o...