检索结果-南通市图书馆

Open Journal of Soil Science 2024年第3期14卷 180-189页

作者： Xinhua Yin Department of Plant Sciences The University of Tennessee Jackson USA

Technologies for reducing corn leaf burn caused by foliar spray of urea-ammonium nitrate (UAN) during the early growing season are limited. A field experiment was carried out to evaluate the effects of humic acid on corn leaf burn caused by foliar spray of undiluted UAN solution on corn canopy at Jackson, TN in 2018. Thirteen treatments of the mixtures of UAN and humic acid were evaluated at V6 of corn with different UAN application rates and different UAN/humic acid ratios. Leaf burn during 1 2, 3, 4, 5, 6, 7, and 14 days after UAN foliar spray significantly differed between with or without humic acid addition. The addition of humic acid to UAN significantly reduced leaf burn at each UAN application rate (15, 25, and 35 gal/acre). The reduction of leaf burn was enhanced as the humic acid/UAN ratio went up from 10% to 30%. Leaf burn due to foliar application of UAN became severer with higher UAN rates. The linear regression of leaf burn 14 days after application with humic acid/UAN ratio was highly significant and negative. However, the linear regression of leaf burn 14 days after application with the UAN application rate was highly significant and positive. In conclusion, adding humic acid to foliar-applied UAN is beneficial for reducing corn leaf burn during the early growing season.

关键词： humic acid Urea-Ammonium Nitrate Corn Leaf Burn N rate Ratio

Effects of Three humic acid Foliar Fertilizers on Quality and Photosynthetic Characteristics of Hawthorn

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Agricultural Research 2024年第7期16卷 48-52页

作者： Jia WANG Xinyu LUO Heli SHANG Dongsheng LAN Qi LIU Jingtao ZHU College of Horticultural Science&Technology Hebei Normal University of Science&TechnologyQinhuangdao 066000China Bureau of Agriculture and Rural Affairs of Kuancheng Manchu Autonomous County Chengde 067300China Hebei(Chengde)Hawthorn Industry Technology Research Institute Chengde 067304China

[Objectives]To investigate the effects of three foliar fertilizers on photosynthetic characteristics,fruit quality and yield of hawthorn.[Methods]Taking hawthorn foliar fertilization as the reference,the photosynthetic rate,transpiration rate,intercellular CO 2 concentration,stomatal conductance and single fruit weight of hawthorn leaves were measured under different concentrations of foliar fertilizer.[Results]The results showed that the photosynthetic rate,transpiration rate and stomatal conductance of hawthorn leaves increased significantly,while the intercellular CO 2 concentration ***,the fish protein peptide foliar fertilizer performed best,with net photosynthetic rate and transpiration rate increased by 57.22%and 57.51%,*** the three foliar fertilizers significantly reduced the intercellular CO 2 *** addition,fertilization significantly increased the single fruit weight of hawthorn,and the effect of fermented fulvic acid foliar fertilizer was the most significant,with the highest growth rate of 68.49%.[Conclusions]Spraying foliar fertilizer significantly increased the content of Vc,titratable acid,anthocyanin and soluble solids of hawthorn fruit,among which fermented fulvic acid foliar fertilizer had the optimal effect.

关键词： Hawthorn humic acid Fulvic acid Fish protein peptide Leaf function Fruit quality

Coating zirconium oxide-nanocomposite with humic acid for recovery of mercury and chromium in hazardous waste of chemical oxygen demand test

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第4期126卷 40-47页

作者： Yujian Lai Liteng Hao Lijie Dong Sujuan Yu Jingfu Liu State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China China Testing&Certification International Group Co. Ltd.Beijing 100024China School of Environment Hangzhou Institute for Advanced StudyUCASHangzhou 310024China Division of Chemical Metrology and Analytical Chemistry National Institute of MetrologyBeijing 100029China Institute of Environment and Health Jianghan UniversityWuhan 430056China

Hazardous waste of chemical oxygen demand (COD) test (HWCOD) is one of the most common laboratory wastewaters,containing large amounts of H_(2)SO_(4)and highly toxic Cr^(3+)and Hg^(2+).Current treatment methods suffered from incomplete removal of Cr^(3+)and ***,a humic acid-coated zirconium oxide-resin nanocomposite (HA-HZO-201) was fabricated for efficient recovery of Cr^(3+)and Hg^(2+)in *** synthesized HA-HZO-201 shows excellent tolerance to wide p H range (1–5) and high salinity (3.5 mol/L Na Cl),as well as adsorption capacity for Cr^(3+)(37.5 mg/g) and Hg^(2+)(121.3 mg/g).After treating with HA-HZO-201 by using a fixed-bed adsorption procedure,the final Cr^(3+)and Hg^(2+)concentrations in HWCOD decreased to 0.28 and 0.02 mg/L,*** addition,the HA-HZO-201 can be regenerated by desorption and recovery of Cr^(3+)and Hg^(2+)using HNO_(3)and thiourea as eluents,*** 5 cycles of adsorption/desorption,the removal efficiencies still reach up to86.0%for Cr^(3+)and 89.7%for Hg^(2+),indicating an excellent regeneration of *** hope this work open new opportunities for treatment of HWCODwith high-efficiency and low-cost.

关键词： COD analysis wastewater Nanocomposite ZrO_(2) Resin humic acid

Effects of fulvic acid and humic acid from different sources on Hg methylation in soil and accumulation in rice

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第9期34卷 93-105页

作者： Shu Ran Tianrong He Xian Zhou Deliang Yin Key Laboratory of Karst Georesources and Environment(Guizhou University) Ministry of EducationGuiyang 550025China College of Resources and Environmental Engineering Guizhou UniversityGuiyang 550025China Guizhou Karst Environmental Ecosystems Observation and Research Station Ministry of EducationGuiyang 550025China

Humus is often used as an organic modifier to reduce the bioaccumulation of heavy metals in plants, but the effects of different humus components from different sources on the fate of mercury(Hg) in paddy fields are still unclear. Here, fulvic acid(FA) and humic acid(HA) extracted from composted straw(CS), composted cow dung(CCD), peat soil(PM) and lignite coal(LC) were used to understand their effects on the methylation and bioaccumulation of Hg in paddy soil by pot experiments. Amendments of both FA and HA largely increased the abundance of Hg-methylating microbes and low-molecular-weight organic matters(e.g, cysteine) in paddy soil. They were also found to change the aromaticity, molecular size and Chromophoric DOM concentration of DOM, and resulted in heterogeneous effects on migration and transformation of Hg. All the FA-amended treatments increased the mobility and methylation of Hg in soil and its absorption in roots. Nevertheless, FA from different sources have heterogeneous effects on transport of Hg between rice tissues. FA-CCD and FA-PM promoted the translocation of Me Hg from roots to rice grains by 32.95% and 41.12%, while FA-CS and FA-LC significantly inhibited the translocation of inorganic Hg(IHg) by 52.65% and 66.06% and of Me Hg by 46.65% and 36.23%, respectively. In contrast, all HA-amended treatments reduced the mobility of soil Hg, but promoted Hg methylation in soil. Among which, HA-CCD and HA-PM promoted the translocation of Me Hg in rice tissues by 88.95% and 64.10%, while its accumulation in rice grains by 28.43% and 28.69%, respectively. In general, the application of some FA and HA as organic modifiers to reduce Hg bioaccumulation in rice is not feasible.

关键词： humic acid Fulvic acid Methylmercury Accumulation Rice

Two-step hydrothermal conversion of biomass waste to humic acid using hydrochar as intermediate

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2023年第10期17卷 17-26页

作者： Yuchao Shao Jun Zhao Yuyang Long Wenjing Lu School of Environment Tsinghua UniversityBeijing 100084China Department of Biology Institute of Bioresource and AgricultureHong Kong Baptist UniversityHong Kong 999077China Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling Instrumental Analysis CenterSchool of Environmental Science and EngineeringZhejiang Gongshang UniversityHangzhou 310012China

Converting biomass materials to humic acid is a sustainable method for humic acid production and achieve biomass valorization. A two-step hydrothermal treatment method was adopted in this study to produce humic acid from corn stalks. In the first step of the process, hydrochar was prepared at different hydrothermal temperatures and pH values. Their chemical properties were then analyzed, and the hydrochar-derived humic acids were produced under alkaline hydrothermal conditions (denoted as HHAalk). The hydrochar, prepared under high temperature (200 °C) and strong acidic (pH 0) conditions, achieved high HHAalk yields (i.e., 67.9 wt% and 68.8 wt% calculated based on weight of hydrochar). The sources of HHAalk formation were as follows: 1) production in the hydrochar preparation stage, and 2) increment under the alkaline hydrothermal treatment of hydrochar. The degree of hydrochar unsaturation was suggested as an indicator for evaluating the hydrochar humification potential under alkaline hydrothermal conditions. This study provides an important reference for the preparation of suitable hydrochar with high hydrothermal humification potential.

关键词： Biowaste Hydrochar humic acid Hydrothermal parameter Unsaturation

Adsorption and desorption of Cd in reclaimed soil under the influence of humic acid:characteristics and mechanisms

在线全文

学校读者我要写书评

暂无评论

International Journal of Coal Science & Technology 2022年第1期9卷 225-235页

作者： Yonghong Zheng Zhiguo Zhang Yongchun Chen Shikai An Lei Zhang Fangling Chen Chengnan Ma Weiqing CAi Huainan Mining(Group)Co.LTD Huainan 232001China National Engineering Laboratory for Protection of Colliery Eco-Environment Huainan 232001China School of Earth and Environment Anhui University of Science and TechnologyHuainan 232001China

Exogenous humus can change the content and migration activity of cadmium(Cd)in *** acid(HA)is an important soluble humus component in *** order to explore the relationship between cadmium pollution mechanism and ecological environment of humic acid in reclaimed soil,the characteristics of humic acid adsorbing cadmium in alkaline conditions were *** study employed reclaimed soil from the Huainan mining area,*** adsorption and desorption characteristics as well as influence mechanisms on the heavy metal cadmium(Cd)were explored under the influence of *** results show that:(1)When Cd concentration was low(0.2–10 mg/L),HA had little effect on Cd adsorption and desorption in reclaimed *** the Cd concentration was high(15–80 mg/L),HA had a great influence on the adsorption and desorption of Cd in reclaimed *** addition of HA can inhibit the adsorption of Cd by reclaimed soil and effectively improve the desorption capacity of Cd by reclaimed soil.(2)The kinetic curves of Cd adsorption and desorption of reclaimed soil with added HA show that both processes(adsorption and desorption)include two stages:rapid reaction and slow *** adsorption of Cd by reclaimed soil under the influence of HA was 18.18%lower than that of normal reclaimed soil,and the increase of Cd desorption was 50.29%.(3)The factors affecting the adsorption and desorption of Cd in the soil were analyzed with gray theory,and their importance can be ordered as follows:Cd concentration>HA concentration>pH>*** the influence of HA,a multi-factor coupling function model of adsorption and desorption of Cd in soil is *** model provides theoretical guidance for the scientific prediction and evaluation of Cd environmental pollution risks in soil and will be useful for developing a new solution for engineering remediation of high concentration Cd contaminated soil.

关键词： Reclaimed soil humic acid Heavy metal Cadmium Adsorption Desorption

Unrecognized role of humic acid as a reductant in accelerating fluoroquinolones oxidation by aqueous permanganate

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第1期33卷 447-451页

作者： Yang Zhou Jianpeng Hu Yuan Gao Yang Song Su-Yan Pang Jin Jiang Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education Institute of Environmental and Ecological EngineeringGuangdong University of TechnologyGuangzhou 510006China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China School of Civil and Transportation Engineering Guangdong University of TechnologyGuangzhou 510006China Key Laboratory of Songliao Aquatic Environment Ministry of EducationSchool of Municipal and Environmental EngineeringJilin Jianzhu UniversityChangchun 130118China

A great concern has been raised regarding the issue of fluoroquinolones(FQs)in the *** this work,the transformation of FQs by commonly used oxidant permanganate(Mn(VII))in the absence and presence of humic acid(HA),ubiquitously existing in aquatic environments,was systematically ***,the catalytic role of in-situ formed MnO;on Mn(VII)oxidation of FQs depending on solution pH and co-existing substrates was firstly *** was interestingly found that HA could appreciably accelerate FQs degradation by Mn(VII)at environmentally relevant *** as a reductant in accelerating FQs by Mn(VII)oxidation was distinctly elucidated for the first time,where MnO;in situ formed from the reduction of Mn(VII)by HA served as a *** products were observed in the presence versus absence of *** that the accelerating role of HA was related to its reducing ability,an activation method based on Mn(VII)and reductant(i.e.,Fe(II),Mn(II)and(bi)sulfite)was proposed,which exhibited considerable potential for application in the treatment of FQs contaminated water.

关键词： Permanganate humic acid Manganese dioxide activation Fluoroquinolones

Weak-acid biochar catalyst prepared from mechanochemically-activated biomass and humic acid for production of 5-hydroxymethylfurfural

在线全文

学校读者我要写书评

暂无评论

Biochar 2022年第1期4卷 490-502页

作者： Haixin Guo Sohei Ogawa Yukiya Isoda Feng Shen Richard Lee Smith Jr Ministry of Agriculture and Rural Affairs Agro-Environmental Protection InstituteNo.31 Fukang RoadNankai DistrictTianjin 300191China Graduate School of Environmental Studies Tohoku UniversityAramaki Aza Aoba 6-6-11AobaSendai 980-8579Japan

Many types of sustainably-prepared functional biochar catalysts are needed to transform biomass substrates into platform *** this work,weak-acid biochar catalysts were prepared by mix ball-milled(10 min,isothermal,room temperature)cherry blossom tree leaf biomass(BM)with humic acid(H)prior to carbonization of samples for 1 h under nitrogen *** of the as-prepared materials(HBM-carbonization temperature in℃)showed that humic acid activated the biochars and increased their number of oxygen-containing functional(-COOH,OH)*** weak-acid biochars were applied as heterogeneous catalysts for dehydration of fructose to 5-hydroxymethylfurfural(5-HMF),where it was found that biochar catalyst,HBM-400,gave 100%fructose conversion and 77.5%5-HMF yields in an ionic liquid(1-butyl-3-methylimidazolium chloride)reaction system(140℃,60 min reaction time).As-prepared HBM-400 biochars exhibited constant catalytic activity for fructose dehydration with repeated use without any type of reactivation treatment and were stable for 5 *** acid is an effective additive for preparing weak-acid catalytic materials from waste biomass.

关键词： humic acid Mixing ball milling Oxygen-containing functional group Weak-acid biochar

humic acid-enhanced electron transfer of in vivo cytochrome c as revealed by electrochemical and spectroscopic approaches

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2014年第5期26卷 1118-1124页

作者： Jiahuan Tang Yi Liu Yong Yuan Shungui Zhou Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangdong Institute of Eco-environmental and Soil Sciences College of Bioscience and Biotechnology Hunan Agricultural University

Out-membrane cytochrome c （Cyt c） plays an important role carrying electrons from the inside of microbes to outside electron acceptors. However, the active sites of Cyt c are wrapped by non- conductive peptide chains, hindering direct extracellular electron transfer （EET）. humic acids （HA） have been previously proven to efficiently facilitate EET. However, the inherent mechanism of HA- stimulated EET has not been well interpreted. Here, to probe the mechanism behind HA-stimulated EET, we studied the interaction between Cyt c and HA. The attachment of active in vivo Cyt c on a graphite electrode was achieved when MR-1 cells were self-assembled on the electrode surface. Pure horse-heart Cyt c was covalently immobilized on an electrode via 4-aminobenzoic acid to create an active in vitro Cyt c-enriched surface. Cyclic voltammetric measurements and scanning electron microscopy confirmed the immobilization of bacterial cells and pure Cyt c protein. Electrochemical methods revealed that HA could enhance the electrocatalytic current of both in vitro and in vivo Cyt c towards oxygen and thiosulfate, suggesting enhanced EET. The blue-shifted soret band in the UV-Vis spectra and changes in the excitation/emission matrix fluorescence spectra demonstrated that Cyt c interacted with HA to form organic complexes via electrostatic or hydrogen-bonding interactions. The results will help understand electron shuttle-stimulated EET and develop bacteria- based bioremediation and bioenergy technologies.

关键词： cytochrome c humic acid in vivo in vitro extracellular electron transfer

humic acid transport in saturated porous media:Influence of flow velocity and influent concentration

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2014年第12期26卷 2554-2561页

作者： Xiaorong Wei Mingan Shao Lina Du Robert Horton State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F University Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Department of Agronomy Iowa State University Ames IA 50011 USA

Understanding the transport of humic acids（HAs） in porous media can provide important and practical evidence needed for accurate prediction of organic/inorganic contaminant transport in different environmental media and interfaces. A series of column transport experiments was conducted to evaluate the transport of HA in different porous media at different flow velocities and influent HA concentrations. Low flow velocity and influent concentration were found to favor the adsorption and deposition of HA onto sand grains packed into columns and to give higher equilibrium distribution coefficients and deposition rate coefficients, which resulted in an increased fraction of HA being retained in ***, retardation factors were increased and the transport of HA through the columns was delayed. These results suggest that the transport of HA in porous media is primarily controlled by the attachment of HA to the solid matrix. Accordingly, this attachment should be considered in studies of HA behavior in porous media.

关键词： Attachment Flow velocity humic acid Initial concentration Porous media Transport