[Identification of Nitrate Sources and the Fate of Nitrate in Downstream Areas: A Case Study in the Taizi River Basin].

A total of 14 samples were collected in May 2016(dry season)and August 2016 (wet season) in the downstream area of the Taizi River. △ N-NO and △ O-NO were determined using the azide method, and △ O-HO was determined using a CO-HO equilibration technique. To identify NO sources and transformations in the downstream area of Taizi River Basin, ion chromatography, Nessler's reagent spectrophotometry, the azide method, and CO-HO equilibration methods were utilized to determine the concentrations of NO, Cl, NH-N, and isotopic compositions (△ N and △ O) of NO and the △ O-HO in surface water.

[Identification of Nitrate Sources and Transformation Processes in Midstream Areas:A Case in the Taizi River Basin].

This study analyzed the nitrate (NO), ammonia nitrogen (NH-N), chloride (Cl), δ N-NO, δO-NO, and δO-HO in the surface water to identify the nitrate sources and transformation processes in midstream areas of the Taizi River basin in May and August 2016, corresponding to the dry season and wet season, respectively. The results indicated that the NO, Cl, and NH-N concentrations and the δO-NO in the dry season were greater than those in the wet season, and the δ N-NO did not show significant seasonal variations based on the Man-Whitney U test. The NO was derived mainly from the mixed sources according to the ranges of NO/Cl, δ N-NO, and δO-NO.

Pd supported on carbon containing nickel, nitrogen and sulfur for ethanol electrooxidation.

Carbon material containing nickel, nitrogen and sulfur (Ni-NSC) has been synthesized using metal-organic frameworks (MOFs) as precursor by annealing treatment with a size from 200 to 300 nm. Pd nanoparticles supported on the Ni-NSC (Pd/Ni-NSC) are used as electrocatalysts for ethanol oxidation in alkaline media. Due to the synergistic effect between Pd and Ni, S, N, free OH radicals can form on the surface of Ni, N and S atoms at lower potentials, which react with CHCO intermediate species on the Pd surface to produce CHCOO and release the active sites.