Article
Chemistry, Analytical
Daisuke Kozaki, Masanobu Mori, Shinichi Hamasaki, Tomotaka Doi, Souma Tanihata, Atushi Yamamoto, Takeshi Takahashi, Koutarou Sakamoto, Shigeto Funado
Summary: A simple method using enclosed quartz cell and cold vapour-atomic absorption spectrometry is proposed for determining total inorganic mercury in solution, achieving similar precision to conventional methods while reducing sample volume, reductant, and cost.
ANALYTICAL METHODS
(2021)
Article
Chemistry, Multidisciplinary
Sandra Spearman, Casey Bartrem, Ainash A. Sharshenova, Kasiet S. Salymbekova, Makhmud B. Isirailov, Saparbai A. Gaynazarov, Roman Gilmanov, Ian H. von Lindern, Margrit von Braun, Gregory Moeller
Summary: Khaidarkan in Batken Province, Kyrgyzstan is home to one of the largest and last primary mercury mines in the world. Doctors without Borders and the Ministry of Health of Kyrgyzstan have discovered a higher incidence of non-communicable diseases in the Batken region, possibly due to environmental pollution. A human health risk assessment was conducted to investigate heavy metal exposure, using a handheld X-ray fluorescence spectrometer for soil screening. The analysis results enable the use of XRF as a quick and cost-effective monitoring tool for mercury contamination in soil.
APPLIED SCIENCES-BASEL
(2022)
Review
Chemistry, Analytical
Guanghui Niu, Alexander Knodel, Sebastian Burhenn, Sebastian Brandt, Joachim Franzke
Summary: The development of miniature, sensitive, high throughput, and in-situ analytical instruments using dielectric barrier discharge (DBD) has become a hot topic in modern analytical chemistry. DBD offers advantages such as easy operation, simple configuration, ambient working temperature and pressure, low power consumption, and miniature dimension. Its applications in analytical atomic spectrometry include serving as excitation or atomization sources in AES, AAS, and AFS, as well as functioning as a vapor generation system.
ANALYTICA CHIMICA ACTA
(2021)
Article
Spectroscopy
Paula Conchado-Amado, Joel Sanchez-Pinero, Jorge Moreda-Pin, Isabel Turnes-Carou, Purificacion Lopez-Mahia, Soledad Muniategui-Lorenzo
Summary: In this study, a vortex-assisted liquid-liquid micro-extraction (VALLME) method was developed for extraction and enrichment of total mercury (Hg) from seawater. The method involved derivatisation of Hg with ammonium pyrrolidine dithiocarbamate (APDC) and quantitation by atomic absorption spectrometry (AAS). Variables affecting the derivatisation and VALLME extraction were investigated. The developed method showed high sensitivity and precision, with an enrichment factor of 51 and extraction recovery of 76% when using specific conditions. The method was validated using certified reference materials and applied to assess Hg levels in seawater samples.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2023)
Article
Chemistry, Multidisciplinary
Yiqing Liu, Ting Kang, Qian He, Yuefu Hu, Zeping Zuo, Zhihua Cao, Bowen Ke, Weiyi Zhang, Qingrong Qi
Summary: The disruption of copper homeostasis may lead to neurodegenerative disorders, highlighting the importance of understanding the role of Cu+ in physiological and pathological processes. A new near-infrared fluorescent turn-on probe (NPCu) was developed based on a Cu+-mediated benzylic ether bond cleavage mechanism, showing high selectivity and sensitivity towards Cu+ and successfully applied for bioimaging of Cu+ in living cells.
Review
Food Science & Technology
Jorgelina Zaldarriaga Heredia, Marcelo Wagner, Florencia Cora Jofre, Marianela Savio, Silvana Mariela Azcarate, Jose Manuel Camina
Summary: Food products, especially those with high value-added, undergo strict quality controls to attest to their specific features. The use of multi-element composition analysis combined with chemometrics has proven to be an effective method for food authentication and quality control. This review provides an overview of the state-of-the-art in this field, highlighting the characteristics and strengths and weaknesses of applied analytical techniques.
CRITICAL REVIEWS IN FOOD SCIENCE AND NUTRITION
(2023)
Article
Chemistry, Analytical
Yaru Zhang, Xuefei Mao, Di Tian, Jixin Liu, Chunsheng Li
Summary: A novel method using low-cost miniaturized hydride generation optical emission spectrometry equipment coupled with an in situ dielectric barrier discharge trap was developed for the determination of As in edible seaweed samples. The method significantly improved the linear range and sensitivity, with a detection limit of 0.2 μg L-1. Application of the method to seaweed samples yielded a method detection limit of 0.25 mg kg(-1) with good accuracy and precision.
ANALYTICAL METHODS
(2021)
Article
Engineering, Multidisciplinary
Jens E. T. Andersen, Keaboletse Moemedi, Kebabonye Katse
Summary: A comprehensible method validation is required to produce reliable levels of uncertainty of measurements for modeling, testing, and comparison in analytical chemistry and other disciplines. New guidelines of quality assurance emphasize precision rather than trueness in determining the uncertainty of measurement. This study validates a high-resolution continuous source flameatomic spectrometry (HR-CS FAAS) method for iron and copper analysis using the principle of pooled calibrations (PoPC), which is not part of contemporary quality assurance guidelines. The unexpected high levels of uncertainties in the analysis of iron and copper may be attributed to human error and substantial detector instability.
Article
Chemistry, Multidisciplinary
Fengqin Yin, Hongzhi Yang, Kaixuan Huo, Xueting Liu, Min Yuan, Hui Cao, Tai Ye, Xiaoyun Sun, Fei Xu
Summary: In this study, As(iii)-imprinted polymers (As(iii)-IIPs) were synthesized and showed good adsorption capacity, selectivity, and regeneration properties for As(iii) ions. They have the potential for detecting, adsorbing, and removing As(iii) ions from real water samples.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Yesica Vicente-Martinez, Maria Jose Munoz-Sandoval, Manuel Hernandez-Cordoba, Ignacio Lopez-Garcia
Summary: Due to the toxicity of mercury, it is necessary to implement analytical procedures that can quantify the different forms of mercury in the environment, even at low concentrations. Additionally, it is desirable for the procedures to distinguish between these forms due to their various environmental and health consequences. This study proposes a dispersive solid-phase microextraction method using a magnetic hybrid material formed by graphene oxide and ferrite (Fe3O4@GO) as the adsorbent, followed by determination using electrothermal atomic absorption spectrometry (ETAAS).
Article
Spectroscopy
Gilberto da S. Coelho Jr, Daniel L. G. Borges, Milan Svoboda, Jiri Dedina, Jan Kratzer
Summary: In this study, a plasma-mediated vapor generation (PMVG) by a dielectric barrier discharge (DBD) was optimized for the detection of inorganic mercury and methylmercury using atomic absorption spectrometry (AAS). The efficiency of PMVG of both species was quantified and the conversion of mercury species to mercury free atoms inside the DBD reactor was proven. The PMVG-AAS method showed similar sensitivity and limit of detection (LOD) compared to the conventional chemical vapor generation (CVG) approach, but with significantly worse LODs due to the smaller sample volume.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2023)
Article
Chemistry, Analytical
Gustavo Rossato Bitencourt, Fabio Andrei Duarte, Valderi Luiz Dressler, Rodrigo Cordeiro Bolzan, Erico Marlon de Moraes Flores, Paola Azevedo Mello
Summary: A single method using chemical vapor generation coupled with microwave-induced plasma optical emission spectrometry was developed for the determination of As and Hg in dietary supplements. The method complied with the maximum concentration requirements set by the United States Pharmacopeia and showed no statistical difference compared to comparative methods. The proposed method can be considered an alternative for the quality control of As and Hg in dietary supplements.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Chemistry, Analytical
Gustavo Rossato Bitencourt, Fabio Andrei Duarte, Valderi Luiz Dressler, Rodrigo Cordeiro Bolzan, Erico Marlon de Moraes Flores, Paola Azevedo Mello
Summary: A single method was developed for the determination of As and Hg in dietary supplements using CVG-MIP OES and MSIS. The optimized MSIS setup improved the detection limit for As and Hg, making it suitable for the limit set by the United States Pharmacopeia.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Chemistry, Analytical
Lucila Brusa, Mabel Tudino, Jonatan Schlotthauer, Mirna Sigrist
Summary: A method based on flow injection hydride generation atomic absorption spectrometry (FI-HGAAS) with an on-line pre-reduction of Se(VI) to Se(IV) was optimized and developed to determine phosphate-extractable Se. The method can eliminate interferences caused by organic matter and provide comparable results to ICP-MS.
Article
Chemistry, Analytical
Gabriel T. Druzian, Mariele S. Nascimento, Rochele S. Picoloto, Marcia F. Mesko, Erico M. M. Flores, Paola A. Mello
Summary: A method for determining sub-ppb levels of mercury in crude oil using cold vapor generation inductively coupled plasma mass spectrometry (CV-ICP-MS) was developed by optimizing the operational parameters for crude oil digestion and evaluating the accuracy of the method. The optimized conditions allowed for the complete digestion of up to 1.2 g of crude oil and achieved a very low limit of detection.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2022)
Article
Environmental Sciences
Carlos A. Manzano, Manuel Jacome, Thant Syn, Carolina Molina, Richard Toro Araya, Manuel Andres Leiva-Guzman
Summary: Air pollution problems are complex and require interdisciplinary collaboration to address. By using ontological analysis and validation from multidisciplinary experts, a framework can be established to help researchers, practitioners, and policy makers better handle air quality issues, improve research allocation, and knowledge dissemination.
INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT
(2021)
Article
Geosciences, Multidisciplinary
Catalina Andrade, Carolina Molina, Luis Felipe Sanchez, Carlos A. Manzano, Richard Toro A, Manuel A. Leiva G
Summary: The adverse health effects of PM are related to oxidative stress processes, and the oxidative potential (OP) can be used as an exposure metric for assessing the health impacts of ambient PM. Research on the relationship between respiratory deposition of size-segregated PM and OP in Santiago, Chile found that PM3.2 dominated lung deposition and may have a greater negative impact on lung health due to efficient adsorption of redox chemical species.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Claudio H. Gonzalez-Rojas, Manuel Leiva-Guzman, Carlos A. Manzano, Rail G. E. Morales S, Richard Toro Araya
Summary: The evaluation of air pollution in the urban area of Calama showed that PM10, PM2.5, and SO2 concentrations exceeded WHO guidelines, with influences from the west wind and local sources. Diurnal variations of PM10 and PM2.5 were related to changes in wind patterns, while noon peak SO2 concentrations may be linked to copper extraction operations. No significant trends were observed for SO2 and O-3 concentrations, with CO levels increasing annually and other pollutants decreasing slightly per year from 2013 to 2016.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Environmental Sciences
Jhojan P. Rojas, Francesco R. Urdanivia, Roy A. Garay, Alan J. Garcia, Carlos Enciso, Elvis A. Medina, Richard A. Toro, Carlos Manzano, Manuel A. Leiva-Guzman
Summary: The nationwide lockdown implemented in Peru significantly improved air quality in the metropolitan area of Lima, with notable reductions in particulate matter and nitrogen dioxide. However, there was a significant increase in ozone concentration due to the decrease in nitrogen dioxide, indicating a hydrocarbon-limited system in the study area.
AIR QUALITY ATMOSPHERE AND HEALTH
(2021)
Article
Environmental Sciences
Richard Toro A, Francisco Catalan, Francesco R. Urdanivia, Jhojan P. Rojas, Carlos A. Manzano, Rodrigo Seguel, Laura Gallardo, Mauricio Osses, Nicolas Pantoja, Manuel A. Leiva-Guzman
Summary: The study of air quality in urban areas during the COVID-19 pandemic in Santiago, Chile, showed that the reduced traffic emissions during the lockdown significantly lowered the concentrations of NOx, CO, and PM2.5, while O3 concentrations increased. The nonlinear response in pollution levels is likely due to changes in vehicular emission patterns and other sources during the pandemic.
Article
Chemistry, Applied
Fabiana Liendo, Amaya Paz de la Vega, Maria Jesus Aguirre, Fernando Godoy, Angel A. Marti, Erick Flores, Jaime Pizarro, Rodrigo Segura
Summary: A glassy carbon modified electrode with electroreduced graphene oxide was developed for the determination of Antimony (III) in commercial lettuce, celery, and beverages. The electrode surface was heterogeneous and rough, with a real area larger than a regular glassy carbon electrode. By using optimal chemical and electrochemical parameters, satisfactory results in terms of accuracy and reproducibility were obtained.
Article
Environmental Sciences
Rafael Solis, A. Richard Toro, Luis Gomez, Andres M. Velez-Pereira, Manuela Lopez, Zoe Louise Fleming, Nicolas Fierro, G. Manuel Leiva
Summary: An assessment of air pollution in a small city in the Chilean Patagonia was conducted using PM concentration data from two monitoring stations over a period of seven years. The study analyzed the city's pollution variability, the impact of meteorological factors, and long-term trends. The results showed that the high PM concentrations observed during the coldest months were mainly due to the use of firewood for heating and cooking. The most polluted days were associated with low temperatures, low wind speed, and high PM2.5/PM10 ratios, indicating a dominance of local firewood sources. Despite a decrease in PM concentrations over time, the annual average PM levels in Coyhaique exceeded national and international air quality thresholds, highlighting the severity of the air pollution problem in the city.
Article
Environmental Sciences
Francisco Catalan, Damian Chandia, Richard Toro Araya, Manuel A. Leiva Guzman
Summary: AtmChile is an R package that allows users to download and manage air quality and climatological data in Chile. It provides intuitive analysis and visualization tools. It is a user-friendly platform for researchers and the public.
Article
Microbiology
Maialen Aldabaldetrecu, Mick Parra, Sarita Soto-Aguilera, Pablo Arce, Amaya Paz de la Vega Quiroz, Rodrigo Segura, Mario Tello, Juan Guerrero, Brenda Modak
Summary: The study showed that adding [Cu(NN1)(2)](ClO4) as a dietary supplement to rainbow trout for 15 days at doses of 29 and 58 μg/g fish did not affect growth, but resulted in changes in copper concentration in the intestine and muscle. High copper levels were detected in pond water after feeding with the complex. The administration of [Cu(NN1)(2)](ClO4) at 58 μg/g of fish for 15 days showed a 75% survival rate against F. psychrophilum.
Article
Environmental Sciences
Carolina Molina, Carlos A. Manzano, Manuel A. G. Leiva, Richard A. Toro
Summary: Oxidative potential (OP) is a parameter that can indicate the ability of particulate matter (PM) to generate reactive oxygen species (ROS). This study evaluated the OP of PM10, PM2.5, and PM1.0 samples in two cities of Chile. The results showed differences in OP between cities, PM size fractions, and seasons, and a strong correlation between OP and certain metals and meteorological variables. Based on these findings, it is suggested that OP be used as a complementary measure to PM mass concentration in air quality management.
ENVIRONMENT INTERNATIONAL
(2023)
Article
Environmental Sciences
Ye Li, Franz Munoz-Ibanez, Ana Maldonado-Alcaino, Darby Jack, Beizhan Yan, Li Xu, Marco Acuna, Manuel Leiva-Guzman, Ana Valdes, Dante D. Caceres
Summary: This study estimated the cancer disease burden in two urban Chilean Municipalities, Coyhaique and Independencia, attributable to exposure to fine particulate matter (PM2.5). The results showed that the primary source of PM2.5 in Coyhaique was firewood burning, resulting in higher concentrations of PAHs and B[a]P compared to Independencia. However, Independencia had significantly higher levels of As and Pb. The health risk indexes (HI and HQ) exceeded acceptable limits in both cities, mainly due to B[a]P and As. The attributable fraction of deaths due to lung cancer and cardiopulmonary cancer from long-term PM2.5 exposure was higher in Coyhaique compared to Independencia. The presence of chemical compounds bound to particles from PM2.5 exposure contributed to a significant fraction of cancer cases and potential adverse effects. Further studies are needed to inform policy-making, particularly regarding PM2.5-bound toxic species from other emission sources, such as firewood burning.
AEROSOL AND AIR QUALITY RESEARCH
(2022)
Article
Environmental Sciences
Rodrigo J. Seguel, Laura Gallardo, Mauricio Osses, Nestor Y. Rojas, Thiago Nogueira, Camilo Menares, Maria de Fatima Andrade, Luis C. Belalcazar, Paula Carrasco, Henk Eskes, Zoe L. Fleming, Nicolas Huneeus, Sergio Ibarra-Espinosa, Eduardo Landulfo, Manuel Leiva, Sonia C. Mangones, Fernando G. Morais, Gregori A. Moreira, Nicolas Pantoja, Santiago Parraguez, Jhojan P. Rojas, Roberto Rondanelli, Izabel da Silva Andrade, Richard Toro, Alexandre C. Yoshida
Summary: This study examines the photochemical atmospheric changes during the pandemic in Bogota, Santiago, and Sao Paulo. The research finds that decreased emissions from mobile sources result in significant reductions in volatile organic compounds, nitrogen oxides, and fine particulate matter. Additionally, the O-3 formation regime shifts, leading to increased ozone concentrations.
ELEMENTA-SCIENCE OF THE ANTHROPOCENE
(2022)
Article
Public, Environmental & Occupational Health
Zvjezdana Bencetic Klaic, Manuel Andres Leiva-Guzman, Andrijana Brozincevic
Summary: This study investigated the influence of local meteorological conditions and number of visitors on ambient particulate matter (PM) mass concentrations and particle fraction ratios at the Plitvice Lakes National Park. The results showed that particles mainly originated from background sources, with some contribution from local anthropogenic activities. The increase in both indoor and outdoor mass concentrations was found to coincide with the increase in the number of visitors. Temperature had different effects on indoor and outdoor PM concentrations.
ARHIV ZA HIGIJENU RADA I TOKSIKOLOGIJU-ARCHIVES OF INDUSTRIAL HYGIENE AND TOXICOLOGY
(2022)
Article
Environmental Sciences
Karina Morales-Solis, Hernan Ahumada, Jhojan P. Rojas, Francesco R. Urdanivia, Francisco Catalan, Tomas Claramunt, Richard A. Toro, Carlos A. Manzano, Manuel A. Leiva-Guzman
Summary: The study in 16 cities in central and southern Chile found that lockdown and social distancing policies during the COVID-19 pandemic significantly impacted the concentrations of atmospheric pollutants, with 11 cities showing significant changes. The most pronounced effects were observed for PM10 and PM2.5, with wood burning identified as a major source of PM in these urban areas.
AEROSOL AND AIR QUALITY RESEARCH
(2021)
Article
Public, Environmental & Occupational Health
Katherine M. Ross, Terri Sullivan, Kelly O'Connor, Stephanie Hitti, Manuel N. Leiva
Summary: The study highlights the importance of community stakeholders' perspectives on youth violence prevention strategies, showcasing both overlapping beliefs and important differences in their perceptions. It emphasizes the need to consider and address the risk factors identified by community stakeholders involved in the implementation and sustainability of such strategies for their success.
JOURNAL OF COMMUNITY PSYCHOLOGY
(2021)