10.1021/acsearthspacechem.8b00008

2018-04-13

Microwave induced helium plasma atomic emission spectroscopy permits direct measurement of picogram levels of elemental mercury in various matrices when combined with multi-dimensional gas chromatography. Two columns with different stationary phases provide e...

10.1021/acsearthspacechem.8b00025

2018-04-11

The organic compounds found in carbonaceous chondrite meteorites provide insight into primordial solar system chemistry. Evaluating the formation and decomposition mechanisms of meteoritic amino acids may aid our understanding of the origins of life and homoc...

10.1021/acsearthspacechem.8b00001

2018-04-05

Two-line ferrihydrite (Fh), ubiquitous in soils, groundwater, and aquatic sediments, may serve as an important sink for sequestering trace metals, metalloids, and organic matter via adsorption/coprecipitation due to its high surface area and reactivity. Altho...

10.1021/acsearthspacechem.8b00016

2018-04-03

Relative to continental crust, sediments underlying sulfidic marine waters are molybdenum-rich, a property preserved in the rock record and useful for characterizing paleoenvironments. The enrichment mechanism is not agreed upon but is attributed at least par...

10.1021/acsearthspacechem.8b00005

2018-03-30

Nanosized iron hydroxides and organic matter (OM) are important scavengers of nutrient elements and dissolved trace-metals in geologic systems. Despite this, little is known about the sorption characteristics of metals to the iron–OM nanocomposites formed by ...

10.1021/acsearthspacechem.8b00019

2018-03-29

The NeON+ molecule is stable with a Ne + NO+ dissociation energy of 0.90 kcal/mol. While this is small, the two vibrational modes that include the neon atom are less than this barrier at 57.9 and 45.0 cm–1. Hence, this “L”-shaped molecule will not readily vib...

10.1021/acsearthspacechem.7b00144

2018-03-29

Silica (SiO2) is a major component of many minerals on the Earth. Under ambient conditions, silica does not react with carbon dioxide (CO2). However, at high pressure and temperature, the stability of silica may be affected by CO2, which becomes supercritical...

10.1021/acsearthspacechem.7b00133

2018-03-16

In this paper, the trapping of ammonia molecules into a clathrate structure has been investigated by means of Grand Canonical Monte Carlo simulations, performed at three different temperatures (100, 150, and 180 K) relevant for the astrophysics environments. ...

10.1021/acsearthspacechem.8b00012

2018-03-16

Biogeochemical interactions of iron and sulfur drive their cycles in many environments, which makes understanding the mechanism of sulfur redox cycling dependent abiotic iron(III) reduction by sulfate-reducing bacteria (SRB) particularly important. Here, we p...

10.1021/acsearthspacechem.7b00141

2018-03-16

The formation mechanisms, thermodynamic stabilities, and water-exchange reactivities of 1:1 monomer aluminum–salicylate (Al–salicylate) complexes in acidic aqueous solution are investigated using the density functional theory-quantum chemical cluster model (D...