- MeSH
- digitální technologie * metody přístrojové vybavení trendy MeSH
- digitální zdraví trendy MeSH
- dostupnost zdravotnických služeb MeSH
- kooperační chování MeSH
- recyklace MeSH
- telemedicína metody MeSH
- vynálezy MeSH
- životní prostředí MeSH
- znečištění životního prostředí * ekonomika prevence a kontrola škodlivé účinky MeSH
Ľudské aktivity a prírodné procesy zapríčinili výskyt ortuti v životnom prostredí. V dôsledku kapacity diaľkového atmosférického transportu, biotransformácie na organické formy, bioakumulácie a biomagnifikácie v potravinovom reťazci v kombinácii s vysokou toxicitou sa ortuť stala prioritným environmentálnym kontaminantom, ktorý Svetová zdravotnícka organizácia označila za jeden z desiatich najnebezpečnejších chemických látok pre zdravie ľudí. Expozície ortuti vo vyspelých krajinách ukazujú značné ekonomické náklady, a to najmä vo forme strát ekonomickej produktivity. Štúdie taktiež poukázali na značné ekonomické výhody prevencie znečistenia životného prostredia ortuťou v USA a na celom svete. Stratégia Európskeho spoločenstva týkajúca sa ortuti (The Community Strategy concerning Mercury) prispela k rozvoju a posilneniu komplexného súboru právnych predpisov Európskej Únie, ktoré sa zaoberajú rôznymi aspektmi problému ortuti. Rastúce obavy viedli k vzniku mnohých foriem medzinárodného úsilia o riešenie týchto otázok. V októbri 2013 bola podpísaná medzinárodná zmluva (Minimatský dohovor o ortuti) na kontrolu globálneho uvoľňovania ortuti do životného prostredia.
Mercury is found in the environment due to human activities or natural processes. Due to long-range atmospheric transport capacity, biotransformation into organic forms, bioaccumulation and biomagnification in the food chain in combination with high toxicity, mercury has become a priority environmental contaminant, which the World Health Organization has identified as one of the ten most dangerous chemicals for public health. Mercury exposures in developed countries show significant economic costs, especially in the form of economic productivity losses. Studies have also highlighted the significant economic benefits of preventing mercury pollution in the US and worldwide. The Community Strategy concerning Mercury has contributed to the development and strengthening of a comprehensive body of European Union legislation dealing with various aspects of the mercury problem. Growing concern has led to many forms of international efforts to address these issues. In October 2013, an international treaty was signed (the Minimata Convention on Mercury) to control the global release of mercury into the environment.
- MeSH
- biologický monitoring MeSH
- Evropská unie MeSH
- látky znečišťující životní prostředí MeSH
- lidé MeSH
- mezinárodní spolupráce MeSH
- otrava rtutí MeSH
- rtuť * škodlivé účinky toxicita MeSH
- sloučeniny rtuti škodlivé účinky toxicita MeSH
- těžké kovy škodlivé účinky toxicita MeSH
- znečištění životního prostředí prevence a kontrola zákonodárství a právo MeSH
- Check Tag
- lidé MeSH
Per- and polyfluoroalkyl substances (PFASs) are man-made chemicals that contain at least one perfluoroalkyl moiety, [Formula: see text]. To date, over 4,000 unique PFASs have been used in technical applications and consumer products, and some of them have been detected globally in human and wildlife biomonitoring studies. Because of their extraordinary persistence, human and environmental exposure to PFASs will be a long-term source of concern. Some PFASs such as perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) have been investigated extensively and thus regulated, but for many other PFASs, knowledge about their current uses and hazards is still very limited or missing entirely. To address this problem and prepare an action plan for the assessment and management of PFASs in the coming years, a group of more than 50 international scientists and regulators held a two-day workshop in November, 2017. The group identified both the respective needs of and common goals shared by the scientific and the policy communities, made recommendations for cooperative actions, and outlined how the science-policy interface regarding PFASs can be strengthened using new approaches for assessing and managing highly persistent chemicals such as PFASs. https://doi.org/10.1289/EHP4158.
- MeSH
- fluorokarbony * MeSH
- látky znečišťující životní prostředí * MeSH
- lidé MeSH
- monitorování životního prostředí MeSH
- vystavení vlivu životního prostředí prevence a kontrola MeSH
- znečištění životního prostředí prevence a kontrola MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Characterisation of geochemical transformations and processes in soils with special focus on the rhizosphere is crucial for assessing metal(loid) bioavailability to plants during in situ immobilisation and phytostabilisation. In this study, the effects of nano zero-valent iron (nZVI) were investigated in terms of the immobilisation of As, Zn, Pb and Cd in two soil types and their potential uptake by plants using rhizobox experiments. Such system allowed monitoring the behaviour of trace elements in rooted and bulk soil compartments separately. Sunflower (Helianthus annuus L.) and ryegrass (Lolium perenne L.) were tested for As-rich (15.9 g As kg-1) and Zn-rich (4.1 g Zn kg-1) soil samples, respectively. The application of nZVI effectively lowered the uptake of all target risk elements into plant tissues. Efficient immobilisation of As was determined in the As-soil without a significant difference between plant and bulk soil compartments. Similarly, a significant decrease was determined for CaCl2-available fractions of Zn, Pb and Cd in nZVI-treated Zn-soil. The behaviour of As corresponded to changes in Eh, while Zn and Cd showed to be mainly pH-dependent. However, despite the observed stabilisation effect of nZVI, high amounts of As and Zn still remained available for plants. Furthermore, the accumulation of the target risk elements in roots and the overall effect of nZVI transformations in the rhizosphere were verified and visualised by SEM/EDS. The following immobilising mechanisms were suggested: (i) sorption onto both existing and newly formed Fe (hydr)oxides, (ii) formation of secondary Fe-As phases, and (iii) sorption onto Mn (hydr)oxides.
- MeSH
- arsen analýza chemie MeSH
- biologická dostupnost MeSH
- Helianthus účinky léků růst a vývoj metabolismus MeSH
- jílek účinky léků růst a vývoj metabolismus MeSH
- kadmium analýza chemie MeSH
- kořeny rostlin chemie MeSH
- látky znečišťující půdu analýza chemie MeSH
- olovo analýza chemie MeSH
- regenerace a remediace životního prostředí * MeSH
- rhizosféra * MeSH
- stopové prvky analýza chemie MeSH
- těžké kovy analýza chemie MeSH
- železo farmakologie MeSH
- zinek analýza chemie MeSH
- znečištění životního prostředí prevence a kontrola MeSH
- Publikační typ
- časopisecké články MeSH
This study was performed to test the feasibility of several decontamination methods for remediating heavily contaminated groundwater in a real contaminated locality in the Czech Republic, where a pharmaceuticals plant has been in operation for more than 80 years. The site is polluted mainly by recalcitrant psychopharmaceuticals and monoaromatic hydrocarbons, such as benzene, toluene and chlorobenzene. For this purpose, an advanced oxidation technique employing UV radiation with hydrogen peroxide dosing was employed, in combination with simple aeration pretreatment. The results showed that UV/H2O2 was an efficient and necessary step for degradation of the pharmaceuticals; however, the monoaromatics were already removed during the aeration step. Characterization of the removal mechanisms participating in the aeration revealed that volatilization, co-precipitation and biodegradation contributed to the process. These findings were supported by bacterial metabolite analyses, phospholipid fatty acid analysis, qPCR of representatives of the degradative genes and detailed characterization of the formed precipitate using Mössbauer spectroscopy and scanning electron microscopy. Further tests were carried out in a continuous arrangement directly connected to the wells already present in the locality. The results documented the feasibility of combination of the photo-reactor employing UV/H2O2 together with aeration pretreatment for 4 months, where the overall decontamination efficiency ranged from 72% to 99% of the pharmaceuticals. We recorded even better results for the monoaromatics decontamination except for one month, when we encountered some technical problems with the aeration pump. This demonstrated the necessity of using the aeration step.
- MeSH
- benzen MeSH
- biodegradace MeSH
- chemické látky znečišťující vodu * MeSH
- chlorbenzeny MeSH
- léčivé přípravky MeSH
- peroxid vodíku MeSH
- podzemní voda * MeSH
- toluen MeSH
- znečištění životního prostředí prevence a kontrola MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Geografické názvy
- Česká republika MeSH
- MeSH
- anestetika inhalační škodlivé účinky MeSH
- ekologie MeSH
- environmentální lékařství MeSH
- environmentální politika * MeSH
- inhalační anestezie * škodlivé účinky MeSH
- látky znečišťující vzduch MeSH
- látky znečišťující životní prostředí MeSH
- lidé MeSH
- znečištění ovzduší prevence a kontrola MeSH
- znečištění životního prostředí * prevence a kontrola MeSH
- Check Tag
- lidé MeSH
- MeSH
- ekologie trendy MeSH
- klimatické změny * MeSH
- lidé MeSH
- morbidita * MeSH
- zachování přírodních zdrojů MeSH
- znečištění životního prostředí prevence a kontrola MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- úvodníky MeSH
Shredded card (SC) was assessed for use as a sorbent of potentially toxic elements (PTE) carried from contaminated soil in various leachates (oxalic acid, formic acid, CaCl2, water). We further assessed SC for retention of PTE, using acidified water (pH 3.4). Vertical columns and a peristaltic pump were used to leach PTE from soils (O and A/B horizons) before passing through SC. Sorption onto SC was studied by comparing leachates, and by monitoring total PTE contents on SC before and after leaching. SC buffers against acidic soil conditions that promote metals solubility; considerable increases in solution pH (+4.49) were observed. Greatest differences in solution PTE content after leaching with/without SC occurred for Pb. In oxalic acid, As, Cd, Pb showed a high level of sorption (25, 15, and 58x more of the respective PTE in leachates without SC). In formic acid, Pb sorption was highly efficient (219x more Pb in leachate without SC). In water, only Pb showed high sorption (191x more Pb in leachate without SC). In desorption experiments, release of PTE from SC varied according to the source of PTE (organic/mineral soil), and type of solvent used. Arsenic was the PTE most readily leached in desorption experiments. Low As sorption from water was followed by fast release (70% As released from SC). A high rate of Cd sorption from organic acid solutions was followed by strong retention (~12% Cd desorption). SC also retained Pb after sorption from water, with subsequent losses of ≤8.5% of total bound Pb. The proposed use of this material is for the filtration of PTE from extract solution following soil washing. Low-molecular-mass organic acids offer a less destructive, biodegradable alternative to strong inorganic acids for soil washing.
- MeSH
- arsen chemie MeSH
- filtrace metody MeSH
- kadmium chemie MeSH
- látky znečišťující půdu chemie MeSH
- monitorování životního prostředí MeSH
- olovo chemie MeSH
- organické látky MeSH
- roztoky chemie MeSH
- těžké kovy chemie MeSH
- znečištění životního prostředí prevence a kontrola MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
