Dissolved organic carbon can alter coastal sediment phosphorus dynamic: Effects of different carbon forms and concentrations.

Coastal waters are receiving increasing loads of dissolved organic carbon (DOC), differing in structural complexity and molecular weights with potential different effects on the phosphorus (P) dynamics in these waters. This study conducted an in-situ investigation in Xiangshan Harbor, China, to explore the patterns of P release in response to DOC inputs. To further elucidate the underlying mechanisms behind the DOC-affected sediment P release, a two-month mesocosm experiment was undertaken with coastal sediment (Xiangshan Harbor) to which acetate, glucose, and humic acid (representing the fermentation product, the simple available carbon, and the refractory humic-like carbon sources, respectively) were separately added to the overlying water at dosages of 0, 5, 10, and 20 mg C L.

Mechanisms of high ammonium loading promoted phosphorus release from shallow lake sediments: A five-year large-scale experiment.

The unprecedented global increase in the anthropogenic-derived nitrogen (N) input may have profound effects on phosphorus (P) dynamics and may potentially lead to enhanced eutrophication as demonstrated in short-term mesocosm experiments. However, the role of N-influenced P release is less well studied in large-scale ecosystems. To gain more insight into ecosystem effects, we conducted a five-year large-scale experiment in ten ponds (700-1000 m each) with two types of sediments and five targeted total N concentrations (TN) by adding NHCl fertilizer (0.

Responses of coastal sediment phosphorus release to elevated urea loading.

Increased urea is one of the common nitrogen forms polluting coastal waters and affecting nutrient dynamics. To investigate the effects of urea on sediment phosphorus (P) release, we carried out a 2-month mesocosm experiment with six targeted loadings of urea (0-0.6 mg N L d).

Bis[6-(3,5-dimethyl-1H-pyrazol-1-yl)picolinato]nickel(II)-aqua-[6-(3,5-dimethyl-1H-pyrazol-1-yl)picolinic acid]dithio-cyanato-nickel(II) (1/1).

In the title cocrystal, [Ni(C(11)H(10)N(3)O(2))(2)]·[Ni(NCS)(2)(C(11)H(11)N(3)O(2))(H(2)O)], both Ni(II) ions are in disorted octa-hedral coordination environments. One Ni(II) ion is coordinated by four N atoms and two O atoms from two tridentate 6-(3,5-dimethyl-1H-pyrazol-1-yl)picolinate (DPP) ligands, while the other Ni(II) ion is coordinated by a tridentate 6-((3,5-dimethyl-1H-pyrazol-1-yl))picolinic acid (DPPH) ligand and by two N atoms and one O atom from two thio-cyanate and one water ligand, respectively. In the crystal structure, mol-ecules are linked by inter-molecular O-H⋯O and O-H⋯S hydrogen bonds, forming extended chains along [010].