Track topics on Twitter Track topics that are important to you
The oxidation of sulfur dioxide (SO2) by peroxides leads to the formation of sulfate in cloud water, contributing to particulate matter (PM) formation. The reaction with hydrogen peroxide (H2O2) is considered to be the main cloud oxidation pathway. Previous studies have examined the oxidation of SO2 in cloud water by small organic peroxides with one functional group; however, oxidation by multifunctional organic hydroperoxides, which are expected to have higher water solubility and reactivity, has not been examined. We investigate the aqueous oxidation of SO2 by the two main isomers of isoprene hydroxyl hydroperoxide (ISOPOOH), the primary low-NOx isoprene oxidation products in the atmosphere. Having large Henry's law constants and being among the most abundant multifunctional hydroperoxides, they are among the most important organic hydroperoxides present in clouds. The pH dependence of the reactions was investigated at cloud relevant pH of 3-6 and the results reveal their importance compared to the oxidation of SO2 via H2O2. Model simulations in GEOS-Chem, updated with the chemistry described herein, highlight the importance of these pathways for sulfate formation in regions with high isoprene emissions and low-NOx atmospheric conditions, especially if they maintain significant SO2 emissions.
This article was published in the following journal.
Name: Environmental science & technology
Aerosol particles and their interactions with clouds are one of the most uncertain aspects of the climate system. Aerosol processing by clouds contributes to this uncertainty, altering size distributi...
The heterogeneous reactions of α-AlO particles with a mixture of ozone (∼50 ppm) and isoprene (∼50 ppm) were studied as a function of relative humidities (RHs). The reactions were monitored i...
Isoprene is a volatile compound produced in large amounts by some, but not all, plants by the enzyme isoprene synthase. Plants emit vast quantities of isoprene, with a net global output of 600 Tg per ...
Limonene is a fragrance widely used in cosmetics and household products. Until recently, contact allergy to limonene was considered rare because positive patch tests to it were infrequently observed. ...
This study investigated the oxidative debromination of 2,2-bis(bromomethyl)-1,3-propanediol (BBMP), a widely used brominated flame retardant, and the corresponding formation of brominated by-products ...
This study will test whether a digital health intervention (DASH Cloud) using smartphones can improve diet quality among women at risk for cardiovascular disease. The DASH (Dietary Approac...
This study is an open-label, prospective, single-centred, randomized control trial, containing both a quantitative and a qualitative component and using a mixed methods design, to evaluate...
The DASH diet is a proven behavioral strategy to reduce blood pressure, however, national adherence rates are poor. Using digital health tools may help to improve adoption of the DASH diet...
The purpose of this study is the verification of Cloud-DX Vitaliti™ Continuous Automated Non-Invasive Blood Pressure Monitor for Clinical Use and Self Measurement according to standards ...
To determine the clinical efficacy of indinavir sulfate or placebo in combination with zidovudine ( AZT ) and lamivudine ( 3TC ) in AIDS patients. Protease inhibitors such as indinavir su...
Storing and processing data on multiple servers that can be accessed through the Internet.
A metabolite of ESTRIOL with a 15-alpha-hydroxyl group. Estetrol can be converted from estriol sulfate or DEHYDROEPIANDROSTERONE SULFATE by the fetal-placental unit.
Derivatives of chondroitin which have a sulfate moiety esterified to the galactosamine moiety of chondroitin. Chondroitin sulfate A, or chondroitin 4-sulfate, and chondroitin sulfate C, or chondroitin 6-sulfate, have the sulfate esterified in the 4- and 6-positions, respectively. Chondroitin sulfate B (beta heparin; DERMATAN SULFATE) is a misnomer and this compound is not a true chondroitin sulfate.
An enzyme that catalyzes the activation of sulfate ions by ATP to form adenosine-5'-phosphosulfate and pyrophosphate. This reaction constitutes the first enzymatic step in sulfate utilization following the uptake of sulfate. EC 126.96.36.199.
3'-Phosphoadenosine-5'-phosphosulfate. Key intermediate in the formation by living cells of sulfate esters of phenols, alcohols, steroids, sulfated polysaccharides, and simple esters, such as choline sulfate. It is formed from sulfate ion and ATP in a two-step process. This compound also is an important step in the process of sulfur fixation in plants and microorganisms.