Environmental Science & Technology Letters最新文献

Repression of Microbial Arsenite Uptake and Methylation by Dissolved Organic Carbon 溶解有机碳抑制微生物对亚砷酸的吸收和甲基化

Environmental Science & Technology Letters Pub Date : 2024-07-15 DOI: 10.1021/acs.estlett.4c00400

Hyun Yoon, Michael A. P. Vega, Jiaxing Wang, Alexandre J. Poulain, Andrea Giometto, L. Aristilde, Matthew C. Reid

引用次数: 0

Zürich II Statement on Per- and Polyfluoroalkyl Substances (PFASs): Scientific and Regulatory Needs 关于全氟烷基和多氟烷基物质 (PFAS) 的苏黎世 II 声明：科学和监管需求

Environmental Science & Technology Letters Pub Date : 2024-04-22 DOI: 10.1021/acs.estlett.4c00147

Jamie C. DeWitt, Juliane Glüge, Ian T. Cousins, G. Goldenman, D. Herzke, Rainer Lohmann, Mark F. Miller, Carla A. Ng, S. Patton, X. Trier, Lena Vierke, Zhanyun Wang, Sam Adu-Kumi, Simona A. Balan, Andreas M. Buser, Tony Fletcher, L. S. Haug, Jun Huang, S. Kaserzon, Juliana Leonel, Ishmail Sheriff, Ya-Li Shi, Sara Valsecchi, M. Scheringer

引用次数: 0

Ozone Generation from a Germicidal Ultraviolet Lamp with Peak Emission at 222 nm 峰值发射波长为222nm的杀菌紫外灯产生臭氧

Environmental Science & Technology Letters Pub Date : 2023-05-25 DOI: 10.1101/2023.05.17.23290115

M. Link, Andrew Shore, B. Hamadani, D. Poppendieck

{"title":"Ozone Generation from a Germicidal Ultraviolet Lamp with Peak Emission at 222 nm","authors":"M. Link, Andrew Shore, B. Hamadani, D. Poppendieck","doi":"10.1101/2023.05.17.23290115","DOIUrl":"https://doi.org/10.1101/2023.05.17.23290115","url":null,"abstract":"Recent interest in commercial devices containing germicidal ultraviolet lamps with a peak emission wavelength at 222 nm (GUV222) has focused on mitigating virus transmission indoors and disinfecting indoor spaces while posing minimum risk to human tissue. However, 222 nm light can produce ozone (O3) in air. O3 is an undesirable component of indoor air because of health impacts from acute to chronic exposure and its ability to degrade indoor air quality through oxidation chemistry. We measured the total irradiance of one GUV222 lamp at a distance of 5 cm away from the source to be 27.0 W m-2 +/- 4.6 W m-2 in the spectral range of 210 nm to 230 nm, with peak emission centered at 222 nm and evaluated the potential for the lamp to generate O3 in a 31.5 m3 stainless steel chamber. In seven four-hour experiments average O3 mixing ratios increased from levels near the detection limit of the instrument to 48 ppbv +/- 1 ppbv (94 ug m-3 +/- 2 ug m-3). We determined an average constant O3 generation rate for this lamp to be 1.10 mg h-1 +/- 0.15 mg h-1. Using a radiometric method and chemical actinometry, we estimate effective lamp fluences that allow prediction of O3 generation by the GUV222 lamp, at best, within 10 % of the measured mixing ratios. Because O3 can react with gases and surfaces indoors leading to the formation of other potential by-products, future studies should evaluate the production of O3 from GUV222 air cleaning devices.","PeriodicalId":12036,"journal":{"name":"Environmental Science & Technology Letters","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86290458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Significant Production of Ozone from Germicidal UV Lights at 222 nm 222nm杀菌紫外线灯产生大量臭氧

Environmental Science & Technology Letters Pub Date : 2023-05-16 DOI: 10.1101/2023.05.13.23289946

Zhe Peng, D. Day, Guy A. Symonds, Olivia J. Jenks, H. Stark, Anne V. Handschy, J. D. de Gouw, J. Jimenez

{"title":"Significant Production of Ozone from Germicidal UV Lights at 222 nm","authors":"Zhe Peng, D. Day, Guy A. Symonds, Olivia J. Jenks, H. Stark, Anne V. Handschy, J. D. de Gouw, J. Jimenez","doi":"10.1101/2023.05.13.23289946","DOIUrl":"https://doi.org/10.1101/2023.05.13.23289946","url":null,"abstract":"Lamps emitting at 222 nm have attracted recent interest for germicidal ultraviolet disinfection (\"GUV222\"). Their impact on indoor air quality is considered negligible. In this study, ozone formation is observed for eight different lamps from five manufacturers, in amounts an order-of-magnitude larger than previous reports. Most lamps produce O3 in amounts close to the first-principles calculation, with e.g. a generation rate of 22 ppb h-1 for Ushio B1 modules in a 21 m3 chamber. Much more O3 is produced by lamps when optical filters were removed for tests, and by an undesired internal electrical discharge. A test in an office shows an increase of ~6.5 ppb during lamp-on periods, consistent with a simple model with the O3 generation rate, ventilation and O3 losses. We demonstrate the use of a photolytic tracer to quantify the averaged GUV222 fluence rate in a room. Low-cost electrochemical O3 sensors were not useful below 100 ppb. Formation of O3 increases indoor particulate matter (PM), which is ~10-30 times more deadly than O3 per unit mass, and which is ignored when only considering O3 threshold limit values. To limit GUV222-created indoor pollution, lower fluence rates should be used if possible, especially under low-ventilation conditions.","PeriodicalId":12036,"journal":{"name":"Environmental Science & Technology Letters","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76730172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Estimating the Global Target Market for Passive Chlorination 估计全球被动氯化的目标市场

Environmental Science & Technology Letters Pub Date : 2022-11-01 DOI: 10.1101/2022.10.27.22281472

Katya Cherukumilli, R. Bain, Yiru Chen, A. Pickering

{"title":"Estimating the Global Target Market for Passive Chlorination","authors":"Katya Cherukumilli, R. Bain, Yiru Chen, A. Pickering","doi":"10.1101/2022.10.27.22281472","DOIUrl":"https://doi.org/10.1101/2022.10.27.22281472","url":null,"abstract":"Deployment of passive (in-line) chlorinators, devices that disinfect water without electricity or daily user input, is one strategy to advance access to safely managed drinking water. Using the Joint Monitoring Programme (JMP) data, we first calculate the number of people in low- and middle-income countries (LMICs) using drinking water sources that are either compatible (piped water, kiosks) or potentially compatible (packaged/delivered water, rainwater, tubewells, boreholes, protected springs) with passive chlorinators. Leveraging water quality data from the Multiple Indicator Cluster Surveys (MICS), we estimate that 2.32 [95% CI: 2.19, 2.46] billion people in LMICs use microbially contaminated (with fecal indicator bacteria) drinking water sources that are compatible (1.51 [1.42, 1.60] billion) or potentially compatible (817 [776, 858] million) with passive chlorinators. The largest target market for passive chlorinators is in South Asia (551 [532, 571] million rural users and 401 [384, 417] million urban users), where over 77% of drinking water sources compatible with passive chlorinators are contaminated. However, self-reported household water treatment practices indicate that chlorination is more common in the African and Latin American regions, suggesting passive chlorination would have higher acceptance in these regions compared to Asia. Reaching the full target market will require establishing passive chlorinator compatibility with handpumps and protected springs and identifying financially viable implementation models.","PeriodicalId":12036,"journal":{"name":"Environmental Science & Technology Letters","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86673677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

First detection of Monkeypox virus genome in sewersheds in France 在法国下水道首次检测到猴痘病毒基因组

Environmental Science & Technology Letters Pub Date : 2022-08-19 DOI: 10.1101/2022.08.18.22278938

S. Wurtzer, Morgane Levert, E. Dhénain, M. Boni, J. Tournier, Nicolas Londinsky, A. Lefranc, O. Ferraris, L. Moulin

引用次数: 10

Environmental Science &amp; Technology Letters最新文献

Environmental Science & Technology Letters最新文献