碱法草浆中段废水微电解法脱色

将微电解法应用于碱法草浆中段废水的脱色处理,并讨论了其影响因素。实验结果表明:在搅拌条件下,铁炭质量比1:2、pH为2、用铁量800mg·L-1、反应时间30min,废水色度的去除率可以达到95%,处理后的废水近乎清澈透明。     

微电解法处理制浆中段废水

本文将微电解法应用于处理制浆中段废水,根据正交试验设计及结果分析得出最佳的试验条件,即反应时间为30min、pH值为3、曝气量为0.8L/min、铁炭体积比为3:1.通过微电解法和FeSO4混凝法对废水脱色率的比较,说明铁/炭微电解法优于FeSO4混凝的处理效果,并通过废水处理前后的紫外和红外光谱,分析其作用机理.     

铁炭微电解法降解皮革加脂剂废水的研究

以皮革加脂剂制备模拟废水,用铁炭微电解法处理,考察初始p H、反应时间、Fe/C质量比以及铁屑粒径对废水中CODCr去除率和可生化性的影响。结果表明:6种加脂剂废水在微电解反应下的最佳条件为p H值3,反应时间在40~60min之间,CODCr去除率达63%以上。BOD5/CODCr由处理前的难生化或不易生化变为可生化或易生化,铁炭微电解法可作为皮革加脂剂废水的一种有效的预处理方式。     

微电解-Fenton法对杨木PRC-APMP制浆废液的脱色研究

利用微电解Fenton法处理杨木PRc—APMP制浆造纸废水,采用单因素试验方法确定各个因素对废水处理效果的影响。采用正交试验设计方法,对微电解-Fenton法处理造纸废水的适应条件进行优化研究,得到最佳反应条件为：pH值为5、铁炭比为1：2（铁屑用量10g／L、粉煤灰用量20g／L）、H2O2用量10mmol／L、反应时间为60min,此时脱色率为80．2％。     

铁屑还原法降解高浓度印染废水

通过正交试验，确定了铁屑还原法（微电解法）处理高浓度印染废水的最佳处理工艺条件：pH值5、铁炭质量比2：1、反应时间60min、曝气量0．4L／min；并比较了微电解法、新生态Fe^2＋混凝法和FeSO4混凝法对去除色度和CODCr，的效果。试验结果表明，微电解法效果最好，其处理的作用机理除絮凝作用、过滤吸附作用外，还包括氧化还原、电附集等协同效应。     

固定漆酶与游离漆酶对造纸废水深度处理的研究

用固定漆酶和游离漆酶对造纸废水进行深度处理,重点分析了两种不同状态的酶在不同反应时间、温度、pH值下对造纸废水的CODCr和色度的去除率。结果表明:游离漆酶在处理废水时,最佳反应时间为8 h,最佳反应温度为55℃,最佳反应pH为5;固定态漆酶在处理废水时,最佳反应时间为6 h,最佳反应温度为50~55℃,最佳反应pH为4;通过对废水处理的效果对比,固定漆酶的优点在于达到最佳效果的反应时间短,酶的稳定性高,温度耐受性强,pH适应性显著增强。     

酸析——微电解法处理草浆制浆黑液的研究

研究了酸析-微电解法处理草浆制浆黑液,实验结果表明,酸析时pH值为3,COD的去除率为69.5%;微电解过程中曝气量为0.4L/min、反应时间为30min、铁炭质量比为2∶1,COD的去除率为62%,有效地减轻了黑液的污染负荷。     

微电解法处理造纸中段废水及其机理探讨

将微电解法应用于处理造纸中段废水,最佳的实验条件为:曝气量0.4 L/min、铁炭质量比2∶1、pH值3、反应时间10min.从铁屑反应前后表面状况的扫描电镜和附集于铁屑表面沉积物的红外光谱分析,比较铁屑/炭对废水微电解处理法、铁屑/炭在酸性水溶液中获得新生态Fe2 混凝法以及直接使用FeSO4混凝法的3种方法去除色度和CODCr效果,说明微电解法有氧化还原作用、絮凝作用、电附集作用、过滤吸附作用等反应机理.     

微波强化铁炭内电解法处理APMP废水

以色度和COD去除率为目标,研究微波强化铁炭内电解技术对自制桉木APMP制浆废水的处理工艺。优化后的工艺条件为:初始pH 3.0,铁炭质量比5:3,活性炭颗粒粒径80目,微波加热功率700 W,加热时间9 min。废水的COD从910 mg·L^-1下降到380 mg·L^-1,去除率60%,色度从2295 C.U.降至575 C.U.,去除率75%。与单一的铁炭内电解处理方法相比,微波强化处理效果优于单纯的内电解法处理。     

稳定剂存在下高铁酸钾氧化深度处理制浆中段废水的研究

研究了稳定剂的加入对高铁酸钾深度处理制浆中段废水的影响。高铁酸钾投加量为60mg/L,pH为4,反应时间为30min时,稳定剂的加入可大大提高废水处理效果。硅酸钠、钼酸钠和磷酸钠的最佳加入量均为0.3g/L,CODCr去除率分别达到52%,50%和47%。在最佳稳定剂加入量的基础上,考察了pH和反应时间对废水处理效果的影响。结果表明以硅酸钠或钼酸钠为稳定剂时最佳pH均为4,最佳反应时间分别为35min和30min;以磷酸钠为稳定剂时最佳pH为5,最佳反应时间为40min。加入稳定剂后,高铁酸钾处理制浆废水的效果大大提高。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press