Bioconcentration factor 生物

WebOct 2, 2012 · The dietary exposure bioconcentration fish test is used for substances where the aqueous exposure methodology is not practicable. In the three test methods the … 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 …

Intercropping wheat and maize increases the uptake of phthalic …

WebApr 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) … WebJun 19, 2024 · 生物富集系数生物富集因子bioconcentration factors，简写BCFBCF是生物组织（干重）中化合物的浓度和溶解在水中的浓度之比，也可以认为是生物对化合物的吸 … list of nascar hall of famers https://histrongsville.com

生物富集系数 - 搜狗百科

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 Web重庆大学,数字图书馆,重大,论坛,bbs,forums,board,数图,电子邮件,民主湖,数据库,资料库,资源库,服务,资料库 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. imdrf cybersecurity working group

Bioconcentration - 生物濃縮 - NAER

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Bioconcentration factor 生物

Evaluation of published bioconcentration factor (BCF) and ...

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 … 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積的難易程度不同，可由生物濃縮系體表示之。

Bioconcentration factor 生物

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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 ... WebBioconcentration factor ( BCF) is the concentration of a particular chemical in a biological tissue per concentration of that chemical in water surrounding that tissue. That is, a …

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 ... 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, …

Webdatabase sources includes 5317 bioconcentration factor (BCF) and 1656 bioaccumulation factor (BAF) values measured for 842 organic chemicals in 219 aquatic species. A data … 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).

Webestimates of the bioconcentration factor (BCF, sometimes denoted as K B) for organic chemicals with log K OW values up to about 9.0 can be obtained using the equation of Bintein et al. (13). The pre-estimate of the bioconcentration factor for such strongly hydrophobic substances may be higher than the steady-state bioconcentration factor …

http://rem-main.rem.sfu.ca/papers/gobas/A%20Review%20of%20Bioconcentration%20factor%20(BCF)%20and.pdf list of nascar pace carsWebBioconcentration Factor. The bioconcentration factor (BCF) describes the readiness of chemicals to concentrate in organisms when the compounds are present in the environment. It is a required eco-toxicological parameter for chemical regulation, for example REACH requires the BCF for all compounds produced or imported over 100 tons per year. list of nascar stockWebBioaccumulation is the uptake of substances via body surfaces (bioconcentration) and through food uptake (biomagnification). The bioconcentration factor (BCF) is the ratio … imdrf management committeeWebTranslations in context of "分配系数对" in Chinese-English from Reverso Context: 正辛醇-水分配系数对数值：4.84（欧盟2002年） list of nasdaq-100 todayWebJan 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 ... imdrf registryWebBioconcentration Factor. The bioconcentration factor (BCF) describes the readiness of chemicals to concentrate in organisms when the compounds are present in the … list of nas pensacola commanding officersWebJul 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. list of nasdaq listed indian companies