Atmospheric chemistry of trifluorodicarbonyls initiated by Cl atoms: Reactivity trends, mechanism, and acid formation yields.

Rate coefficients of the gas-phase reactions of Cl atoms with a series of fluorinated diketones (FDKs): CFC(O)CHC(O)CH (TFP), CFC(O)CHC(O)CHCH (TFH) and CFC(O)CHC(O)CH(CH) (TFMH), have been measured at (298 ± 2) K and under atmospheric pressure. The experiments were performed using the relative-rate method with a GC-FID detection system. From different determinations and references used, the following rate coefficients were obtained (in cm/(molecule·sec)): k(TFP + Cl) = (1.

Single and combined phytoextraction of lead and cadmium on submerged plants Potamogeton pusillus L.: removal, bioaccumulation pattern, and phytotoxicity.

Under the present investigation, the submerged plant Potamogeton pusillus has been tested for the removal of lead (Pb) and cadmium (Cd). P. pusillus removal efficiency and accumulation capacity were examined in separated Pb and Cd solutions, at 0.

Experimental and Theoretical Kinetic Studies of the Ozonolysis of Selected Allyl Sulfides (HC═CHCHSR, R = CH, CHCH): The Effect of Nascent OH Radicals.

Rate coefficients of the O-initiated oxidation of allyl methyl sulfide (HC═CHCHSCH, AMS) and allyl ethyl sulfide (HC═CHCHSCHCH, AES) were determined at atmospheric conditions by "in situ" FTIR. The relative kinetic experiments were performed using methylcyclohexane (McH) and carbon monoxide (CO) as nascent OH radical scavengers and in the absence of any scavenger, to determine the impact that the formation of OH radicals has on the rate coefficients. In the absence of scavengers, values of = (5.

FTIR product study of the Cl-initiated oxidation products of CFC replacements: (/)-1,2,3,3,3-pentafluoropropene and hexafluoroisobutylene.

A product study of the reactions of (/)-1,2,3,3,3-pentafluoropropene ((/)-CFCF[double bond, length as m-dash]CHF) and hexafluoroisobutylene ((CF)C[double bond, length as m-dash]CH) initiated by Cl atoms were developed at 298 ± 2 K and atmospheric pressure. The experiments were carried out in a 1080 L quartz-glass environmental chamber coupled FTIR spectroscopy to monitor the reactants and products. The main products observed and their yields were as follows: CFC(O)F (106 ± 9)% with HC(O)F (100 ± 8)% as a co-product for (/)-CFCF[double bond, length as m-dash]CHF, and CFC(O)CF (94 ± 5)% with HC(O)Cl (90 ± 7)% as a co-product for (CF)C[double bond, length as m-dash]CH.

Degradation mechanism of 2-fluoropropene by Cl atoms: experimental and theoretical products distribution studies.

The gas-phase reaction products of 2-fluoropropene (2FP) with Cl atoms have been determined for the first time at 298 K and atmospheric pressure using a 1080 L quartz-glass photoreactor coupled with FTIR spectroscopy to monitor reactants and products. Acetyl fluoride and formyl chloride were observed as the main products with yields of (106 ± 10)% and (100 ± 11)%, respectively. Electronic structure calculations of reactants, intermediates, products and transition states on a detailed mechanism of the reaction were performed by DFT procedures (BMK, M06, M062X/D3), as well as accurate composite methods on both the addition and abstraction reaction channels.