Bioconcentration factor 生物

Author: farx

August undefined, 2024

WebBiomagnification, also known as bioamplification or biological magnification, is the increase in concentration of a substance, e.g a pesticide, in the tissues of organisms at successively higher levels in a food chain. [1] This increase can occur as a result of: Persistence – where the substance cannot be broken down by environmental processes. WebJul 13, 2024 · Per¿ and polyfluoroalkyl substances (PFAS) are a group of man¿made chemicals of concern across the globe, and some of the PFAS chemicals are known to be bioaccumulative in aquatic species. A literature search for bioconcentration factors (BCFs) and bioaccumulation factors (BAFs) for PFASs has been done and data for 17 …

Bioconcentration and translocation of heavy metals in the soil …

WebNov 1, 1990 · Bioconcentration is the process of accumulation of water-borne chemicals by fish and other aquatic animals through nondietary routes. A proportionality constant relating the concentration of a chemical in water to its concentration in the aquatic animal at steady-state equilibrium is the bioconcentration factor (BCF). http://v2.lib.cqu.edu.cn/asset/search?key=K%3d+Kinetics how to stay logged into gmail windows 10

生物濃縮係數_百度百科

WebJul 15, 2024 · bioconcentration values for the test substance should be determined using at least two concentrations during the exposure phase which are a factor of 10 apart, … WebResults showed that the bioconcentration factor of Cu was higher than 1 in the roots, stems and leaves of Avicennia trees and of Zn was higher than 1 in the roots of Rhizopora trees at station 1. WebBioconcentration factor (BCF) is the ratio of the concentration of the substance in a specific genus to the exposure concentration, at equilibrium (Paradigms Lost, 2006 ) how to stay logged in windows 10

Bioconcentration Factor - an overview ScienceDirect Topics

WebOct 10, 2024 · 生物濃縮係數 (Biocon Centration Factor，BCF)是指生物體內某種元素或難分解的化合物的濃度同它所生存的環境中該物質的濃度比值，可用以表示生物濃縮的程度，又稱濃縮係數、生物富集係數、生物積累率等 [2] 。. 生物濃縮係數是一個無量綱的數值。. 可 … Web新たな生物蓄積性評価法. Lab-data . 餌（経口）からの間接的取り込み経路. BMF（biomagnification factor） Lab-data . 水（経鰓）からの直接的取り込み経路. … how to stay logged into edgeWebbioconcentration factor: The ratio of the concentration of a particular chemical in a living organism to the chemical’s concentration in the surrounding water. how to stay logged into my microsoft account

"Webdatabase sources includes 5317 bioconcentration factor (BCF) and 1656 bioaccumulation factor (BAF) values measured for 842 organic chemicals in 219 aquatic species. A data quality assessment ﬁnds that 45% of BCF values are subject to at least one major source of uncertainty and that measurement errors generally result in an underestimation of ... " - Bioconcentration factor 生物

Bioconcentration factor 生物

OECD Guidelines for the Testing of Chemicals, Section 3

WebBioaccumulation is the uptake of substances via body surfaces (bioconcentration) and through food uptake (biomagnification). The bioconcentration factor (BCF) is the ratio … WebJan 15, 2024 · The aim of this work was to develop and critically evaluate several machine learning-based modelling tools for prediction of bioconcentration factor (BCF) in both a fish (Cyprinus carpio) and an invertebrate species (Gammarus pulex) for the first time. An open access fish BCF dataset was used in the first instance to build and compare 24 ...

Did you know?

WebThe information on aquatic species, other than fish, that pertains to bioconcentration factors, metabolism, and elimination is rather limited in the literature. The kinds of basic … Bioconcentration can be described by a bioconcentration factor (BCF), which is the ratio of the chemical concentration in an organism or biota to the concentration in water: $${\displaystyle BCF={\frac {Concentration_{Biota}}{Concentration_{… In aquatic toxicology, bioconcentration is the accumulation of a water-borne chemical substance in an organism exposed to the water. There are several ways in which to measure and assess See more A bioconcentration factor greater than 1 is indicative of a hydrophobic or lipophilic chemical. It is an indicator of how probable a chemical is to bioaccumulate. These chemicals have high lipid affinities and will concentrate in tissues with high lipid content instead of … See more In determining the degree at which bioconcentration occurs biological factors have to be kept in mind. The rate at which an organism is exposed through respiratory surfaces and contact with dermal surfaces of the organism, competes against … See more Regulatory uses Through the use of the PBT Profiler and using criteria set forth by the United States Environmental Protection Agency under the Toxic Substances Control Act (TSCA), a substance is considered to be not bioaccumulative if it … See more Predictions Bioconcentration factors facilitate predicting contamination levels in an organism based on chemical concentration in surrounding water. BCF in this setting only applies to aquatic organisms. Air … See more Temperature Temperature may affect metabolic transformation, and bioenergetics. An example of this is the movement of the organism may … See more • PBT Profiler • Ruth "The Hammer" Sofield • Persistent Organic Pollutants See more

WebJul 15, 2024 · bioconcentration values for the test substance should be determined using at least two concentrations during the exposure phase which are a factor of 10 apart, plus the appropriate control(s). Preliminary toxicity tests or a range-finding test can be used to establish the appropriate test solution concentrations for the definitive test. WebBioaccumulation is the process of a chemical moving from the external environment into the organism from all possible exposure routes (water, sediment, soil, air, or diet) and is expressed as a bioaccumulation factor (BAF). Bioaccumulation in aquatic organisms from water alone is measured as the bioconcentration factor (BCF) (USEPA, 1999a,b).

WebOct 15, 2024 · In Table 1 we define the bio-uptake factors and terminology employed herein and widely used in modelling and monitoring studies. 1–5 The bioconcentration factor (BCF) expresses the increase in … Web大量试验结果表明，微量的铯能保持生物体内电解质平衡，但过量的铯具有毒性作用，这种双重作用表现出了铯在生物学功能调节和效应中的复杂性[7]。被铯污染的植物自身生长受到影响，铯直接导致菠菜(Spinacia oleracea)叶片光合作用受到抑制，降低其光合效率 ...

Web名詞解釋: 生物自水中吸收化學物質而體內組織累積，使其體內之濃度高於環境濃度的現象。吸收化學物質的管道可直接自體表、腸管或鰓。各種化學物質經生物濃縮作用在體內累 …

WebBioconcentration factor (BCF) is the heavy metal concentration present in the plant biomass divided by heavy metal in FA (Raj et al., 2024 ). It is an important parameter in … how to stay logged in to sites on edgehttp://rem-main.rem.sfu.ca/papers/gobas/A%20Review%20of%20Bioconcentration%20factor%20(BCF)%20and.pdf how to stay logged into instagramWeb名詞解釋: 生物自水中吸收化學物質而體內組織累積，使其體內之濃度高於環境濃度的現象。吸收化學物質的管道可直接自體表、腸管或鰓。各種化學物質經生物濃縮作用在體內累積的難易程度不同，可由生物濃縮系體表示之。 how to stay logged into sharepointWebWhether crop intercropping can affect the uptake of phthalic acid esters (PAEs) by plant roots from soils is unclear. In this study, we compare the PAE uptake by plant roots between the wheat/maize intercropping and the wheat and maize monocropping in a field work. We show that the PAE bioconcentration factors of wheat and maize roots are remarkably … react quarkusWebdatabase sources includes 5317 bioconcentration factor (BCF) and 1656 bioaccumulation factor (BAF) values measured for 842 organic chemicals in 219 aquatic species. A data … how to stay logged out of microsoft accountWebBioconcentration is the intake and retention of a substance in an organism entirely by respiration from water in aquatic ecosystems or from air in terrestrial ones.Bioaccumulation is the intake of a chemical and its concentration in the organism by all possible means, including contact, respiration and ingestion.Biomagnification occurs when the chemical is … how to stay long when having sexWebApr 20, 2024 · Bioconcentration is a term used in aquatic toxicology and refers to the accumulation of a chemical when water is the exclusive source of the chemical in or on an organism. A bioconcentration factor (BCF) … react query 4