[Spatial Distribution, Risk, and Influencing Factors of River Water-Sediment Heavy Metals in the Lower Reaches of the Qianhe River].

The spatial distribution of heavy metals in rivers is affected by human activities and the natural environment, posing a risk to human health related to heavy metal pollution. In order to study the characteristics, health risk levels, and influencing factors of heavy metal distribution and pollution in the lower reaches of the Qianhe River, 19 surface sediments and 20 water samples were collected, and the contents of As, Cd, Cr, Cu, Mn, Ni, Pb, and Zn were measured by inductively coupled plasma mass spectrometry(ICP-MS). Using the DEM, air temperature, precipitation and other 11 factors as independent variables, the spatial differentiation of heavy metal pollution in sediments were explored based on geo-detector and geo-weighted regression model.

Ecological risk and source analysis of soil heavy metals pollution in the river irrigation area from Baoji, China.

Due to various human activities, soil quality under different land use patterns is deteriorating all over the world. This deterioration is very complex in the river irrigation area and is caused by multi-point and non-point source pollution and seasonal variation. Therefore, the characteristics and sources of soil metal pollution in river irrigation area of Baoji city were analyzed.

[Heavy Metal Pollution Characteristics and Influencing Factors in Baoji Arban Soils].

In order to analyze the sources and factors influencing heavy metal pollution in industrial cities, 62 surface layer (0-20 cm) soil samples were collected in Baoji City for analysis using inductively coupled plasma mass spectrometry (ICP-MS). Cd, As, Cu, Pb, Zn, Cr, Mn, and Ni were detected in the samples. Based on geostatistical methods and geo-detector models, the soil heavy metal pollution load index (PLI) was selected as the best indicator of factors affecting heavy metal pollution.

Effects of the combined pollution of cadmium, lead and zinc on the phytoextraction efficiency of ryegrass ( L.).

The effects of cadmium (Cd), lead (Pb) and zinc (Zn) combined pollution on the phytoextraction efficiency of ryegrass ( L.) were investigated in this work. Orthogonal experimental design was adopted in pot test (composition and interaction).

Study on adsorption of methylene blue by a novel composite material of TiO and alum sludge.

A composite material of TiO and alum sludge (TiO@AS) is reported in this paper. The samples of alum sludge (AS) and TiO@AS were characterized using a field emission scanning electron microscope (FE-SEM), an energy dispersive spectrometer (EDS) and an Ultima IV X-ray diffractometer (XRD). In order to study the adsorption capacity and the adsorption mechanism of methylene blue by TiO@AS in aqueous solution, three indexes - pH, adsorbent dosage and initial concentration of methylene blue - were investigated to evaluate the adsorption capacity of TiO@AS.

An instantaneous near-infrared trimethyl lock based fluorescent probe for biothiols with a large Stokes shift.

Using trimethyl lock as a useful mean, a selective and sensitive fluorescent probe was developed for the detection of biothiols with an emission in near infrared spectral region (694 nm) and a large Stokes shift (129 nm). The inserted trimethyl lock between the fluorophore and the sensing group, 2, 4-dinitrobenzensulfonate, highly improved the response rate of this probe toward GSH because the unfavorable steric interactions between three methyl groups resulted in an extremely rapid intramolecular lactonization reaction to form a hydrocoumarin. This probe displayed an instantaneous response (within seconds) to GSH at a very low concentration in aqueous medium and the detection limit was as low as 2.

A Triple-Emission Fluorescent Probe for Discriminatory Detection of Cysteine/Homocysteine, Glutathione/Hydrogen Sulfide, and Thiophenol in Living Cells.

Thiols, such as cysteine (Cys), homocysteine (Hcy), glutathione (GSH), hydrogen sulfide (HS), and thiophenol are metabolically correlated with each other via redox reactions. As a result of the similarity of chemical properties between Cys, Hcy, GSH, HS, and thiophenol, it is very challenging to develop an effective methodology to differentiate them. In this work, a triple-emission fluorescent probe, NCQ, was reported for the simultaneous detection of Cys/Hcy, GSH/HS, and thiophenol with high sensitivity and selectivity.

A red-emitting fluorescent probe for the detection of Hg in aqueous medium, living cells and organisms with a large Stokes shift.

A red-emitting fluorescent probe has been developed for the selective and sensitive detection of Hg2+. With the addition of Hg2+, the solution of probe 1 displayed a remarkable fluorescence enhancement (102 fold) with λemmax = 625 nm and a large Stokes shift (150 nm). The detection limit of this probe was as low as 7.

A red-emitting fluorescent probe for hydrogen sulfide in living cells with a large Stokes shift.

A red-emitting fluorescent probe was developed for the sensitive and selective detection of HS. Upon treatment with HS, this probe exhibited a remarkable fluorescence enhancement (10 fold) with a large Stokes shift (125 nm). The detection limit of this probe was as low as 5.