Bioconcentration factor 生物
Web富集系数（BCF）即生物体内污染物的平衡浓度与其生存环境中该污染物浓度的比值。许多污染物在生物体内的浓度远远大于其在环境中的浓度，并且只要环境中这种污染物继续存在，生物体内污染物的浓度就会随着生长 … 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).
Bioconcentration factor 生物
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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 … WebBioconcentration 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 …
Web本发明提供一种采用微宇宙体系评价水体污染物生物有效性的装置及方法。首先构建实验装置，主要包括：环境条件控制体系、化合物给料体系和化合物暴露体系，特征在于：环境条件控制体系即人工气候培养箱，用于控制体系内环境条件；化合物给料体系和暴露体系通过蠕动泵相连，包括四种型号 ... 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 WebBioaccumulation is the uptake of substances via body surfaces (bioconcentration) and through food uptake (biomagnification). The bioconcentration factor (BCF) is the ratio …
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 …
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 dying relaxed hair blackWebNov 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). crystal salt and pepper shakers vintageWebBioconcentration 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 … dying relaxed hair light brownWebResults 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. dying respiration chartingWeb摘要： 土壤中的农药残留会引起一系列环境危害,也会被农作物吸收富集,对食品安全和人畜健康造成潜在威胁.研究作物对残留农药的吸收,转运及其吸收机制对于农药的风险评估,新农药的创制以及残留农药的植物修复均有重要参考意义.本文以广泛种植的主食作物小麦为模式植物,用水培实验研究了 ... dying relaxed hair blueWebBioconcentration 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 phytoremediation determining information on the metal uptake, its mobilization into the plant tissues, and storage in the shoot parts ( Newman & Unger, 2003 ). dying relationshipWebCalculation. 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: = Bioconcentration factors can also be related to the octanol-water partition coefficient, K ow.The octanol-water partition coefficient (K ow) is correlated with the … dying relaxed hair burgundy