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Bioconcentration factor 生物

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bioconcentration factor - Medical Dictionary

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 ... 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, … detached farmhouse garage plans 3 ca https://wakehamequipment.com

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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 ... 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 WebTranslations 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） chumby classic computer

Bioconcentration Factor - an overview ScienceDirect Topics

Category:Bioconcentration Factor (BCF) and Translocation Factor (TF) …

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Bioconcentration factor 生物

Bioaccumulation and toxicity of silver compounds: A review

WebThe Bioaccumulation Factor (BCF) expresses the ability to accumulating metals in the roots. BCF is calculated as: [roots]/ [soil]. Usually plants with BCF higher than one (>1) have potential for ... 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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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) … 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 …

WebJan 1, 2016 · 4.1.3. Bioconcentration Factor (BCF) BCF is defined as the uptake of contaminants from the dissolved phase; it can be calculated by the following equation: (4.4) BCF = C / C w where C is the contaminant concentrations in the organisms (μg/kg) under equilibrium condition, C w is the contaminant concentration in the water (μg/L). A key … WebBCF（Bioconcentration Factor:生物濃縮係数）： 一定の期間水生生物が化学物質の曝露を受けたとき の生物体内の化学物質濃度を、その期間の周辺水中 の化学物質濃度で …

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. 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 …

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 …

WebBioconcentration and translocation of heavy metals in the soil-plants system in Machangqing copper mine, Yunnan Province, China ... 机译：中国云南云南铜矿土壤 - 植物系统中重金属的生物浓缩及易位 ... The extent of soil contamination was evaluated by calculating the Single factor pollution index (Pi) and Nemerow ... chumby computerWebBioconcentration factor (BCF) is the ratio of the concentration of the substance in a specific genus to the exposure concentration, at equilibrium (Paradigms Lost, 2006 ) chumby clockWeb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 … detached farmhouse garageWebBioconcentration 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 ). chumby dashWebCalculation. 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 … detached for cause navyWebdatabase 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 ... detached footrest patioWebResults 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. detached floating rib