Ratiometric detection of hypochlorite applying the restriction to 2-way ESIPT: simple design for “naked-eye” tap water analysis

Chemosensor is sensitive enough to prove that boiling tap water for ten minutes is a good practice before drinking it.

Simultaneous determination of sulfonylurea herbicide synthetic binary mixtures by a partial least square method combined with micellar-enhanced photochemically-induced fluorescence application to tap water analysis

A combination of the partial least square method in its first variable (PLS-1) with micellar-enhanced photochemically- induced fluorescence (MEPIF) was developed for the simultaneous determination of synthetic binary mixtures of four sulfonylurea herbicides in aqueous micellar solutions, and applied to tap water analysis. Because of their similar features, the MEPIF emission spectra of these herbicides were found to severely overlap in the whole wavelength region. After optimization of the calibration matrix, the PLS-1-MEPIF method was applied to the resolution of chlorsulfuron/metsulfuron methyl and sulfometuron methyl/3-rimsulfuron binary mixtures. The analytical results obtained by the PLS-1-MEPIF method were presented and compared to those of the first-derivative PIF one. An application of the PLS-1-MEPIF method to the quantitative analysis of Paris tap water samples spiked with the herbicide binary mixtures led to recovery values ranging between 63 and 118 %, depending on the mixture.

Interindividual Differences in Acuity for Odor and Aroma

To determine the olfactory acuity of 27 subjects a sensory test was presented which was divided into 4 subtests, 2 for nasal and 2 for oral stimulation. Each subtest contained 28 (4 substances × 7 concentrations) olfactory detection tasks (items). The substances used were lemon and rum aroma as well as ethyl butyrate and amyl acetate, the solvents tap water and sugared tap water. Analysis showed that the test provided a clear differentiation between subjects of low, medium, and high olfactory acuity. The intercorrelations among the test substances and the split-half reliabilities of the subtests proved relatively high, whereas only moderate to low intercorrelations among the subtests were found. This was considered an effect of intraindividual variations of olfactory sensitivity. Finally, some conclusions for the construction of acuity tests for odor and aroma are presented.