微波消解ICP-AES法测定食品中重金属的研究

用硝酸-过氧化氢作消解液,用微波消解法处理样品,采用ICP-AES法测定食品中锌、铁、锰、铜、镉、铬、砷等7种重金属元素的含量.测定结果的相对标准偏差RSD<6%,加标回收率在92.6%～106%之间,检出限在0.764 μg/L～1.537 μg/L之间.该方法快速、稳定、准确,测定结果令人满意,适合食品中重金属元素的测定.     

微波消解-ICP-AES测定皮革及其制品中10种重金属

建立了微波消解-电感耦合等离子体发射光谱法同时测定皮革及其制品中As、Cd、Cr、Cu、Co、Hg、Pb、Sb、Se、Ni等10种重金属含量的分析方法。对微波消解的时间和温度进行了优化,并研究了测试的仪器工作条件及共存离子的干扰等因素。在试验选定的最佳条件下,各元素的线性相关系数均≥0.9990,方法检出限在5~20 ng/mL之间,皮革样品中不同浓度加标回收率为92.4%～106.8%,相对标准偏差小于6.4%。本方法准确快速、检测限低、线性范围宽,可同时测定多种元素,用于皮革中10种重金属含量的测定,结果令人满意。     

梵净山绿茶中10种有害元素含量测定分析

了解梵净山绿茶中铅、砷、镉、铬、汞、铜、锌、钴、镍、锡10种有害元素含量,为茶叶的加工生产和安全质量控制提供科学依据。采用微波消解法消解样品,利用电感耦合等离子体质谱仪(ICP-MS)测定样品中重金属元素含量。结果表明:从整体水平上看,梵净山绿茶中重金属含量远低于国家卫生标准,重金属含量处在安全的水平,茶叶中10种重金属平均含量为锌铜镍铬钴铅锡砷镉汞,其中锌的含量最高达36.476 3 mg/kg,Hg未检出。本方法在0~1 000 ng/m L内呈良好的线性关系(r≥0.999 9),元素检出限为0.000 056 46 ng/m L~0.098 85 ng/m L,加标回收率为96.00%~102.20%,相对标准偏差为0.90%~4.33%。     

口服液类保健食品中18种重金属元素检测

本文旨在建立一种基于微波消解-电感耦合等离子质谱(Inductively coupled plasma mass spectrometry,ICP-MS)测定源于中草药的口服液类保健食品中18种重金属元素(Pb、Cd、As、Hg、Cu、Pt、Pd、Ir、Rh、Ru、Os、Mo、Ni、Cr、V、Mn、Fe、Zn)的方法。采用微波消解法处理口服液样品,以Ge、In、Bi元素作为校正基体效应与信号漂移的内标元素,使用ICP-MS对十批样品中18种重金属进行含量测定。结果显示18种重金属标准曲线线性关系良好,R2≥0.999,各元素的检出限在0.0001～2.743 ng/mL之间,精密度RSD在0.49%～4.29%之间,重复性RSD值在1.2%～15%之间,加样回收率在82.74%～122.7%之间;检测两种口服液中18种重金属元素均未超标。表明该方法操作简便、分析速度快、灵敏度高、准确性好,适用于口服液类保健食品中重金属检测,可为保健食品安全性评价提供依据。     

微波消解-原子荧光光谱法测定苹果中的汞

建立了微波消解-原子荧光光谱法测定苹果中汞的方法,采用密闭微波消解苹果样品,优化了微波消解条件和仪器测定条件。方法的检测限为0.00043ng/mL,RSD为2.01%,回收率在98%～104%之间,方法简便、快速、准确,结果令人满意。     

微波消解——ICP—OES测定皮革及其制品中的重金属含量

建立了微波消解-ICP-OES准确、快速测定皮革及其制品中多种重金属元素的分析方法.结果表明,优化微波消解条件和ICP-OES分析条件后,方法检出限(3S/N)为0.02～0.12 mg/kg,3种浓度水平的加标回收率在91.1%～105.8%之间,相对标准偏差小于8.9%.该方法适用于皮革及其制品中重金属元素的日常检测.     

ICP-MS法同时测定卷烟滤嘴用丝束中的铬、镍、铜、砷和铅

采用HNO3/H2O2微波4步消解-电感耦合等离子体质谱法同时测定了醋酸纤维和聚丙烯纤维丝束中Cr、Ni、Cu、As、Se、Cd和Pb元素,并对第4步消解时间进行了优化。结果显示:①第4步消解的适宜条件为190℃下消解20min;②各元素的回收率在86.38%～117.2%之间,RSD<25%,检出限25.20～245.1ng/L;③2种丝束样品中均未检出Se和Cd。     

微波等离子体炬原子发射光谱法测定葡萄酒中的铅

铅是重金属元素,因此食品中铅污染的控制对人体健康至关重要。文中用微波等离子体炬(MPT)为激发光源,氩气为等离子体工作气体,用气动雾化进样,研究了微波消解微波等离子体炬原子发射光谱法(MPTAES)测定葡萄酒中的铅元素的方法。详细考察了微波功率、载气流量、工作气流量、氧屏蔽气流量、硝酸浓度等实验参数对测定铅的影响,同时考察了易电离元素K、Na、Ca、Mg对铅发射强度的影响。并对微波消解葡萄酒样品的消解条件进行了考察,建立了最佳消解程序。测定铅的检出限25.18ng/mL,RSD1.5%～1.8%,线性范围0.05～100μg/mL,加标回收率99.8%～101.3%。实验结果表明,微波消解和MPTAES联用可成为测定葡萄酒中铅含量的一种操作简单、快速准确、自动化程度高,行之有效的分析方法。     

微波消解-电感耦合等离子体质谱法测定油茶籽油中的5种重金属元素

建立微波消解-电感耦合等离子体质谱法测定油茶籽油中的Pb、Cd、Cr、Cu、As五种重金属元素的方法。优化微波消解条件和仪器测定条件,选择同位素187Re、103Rh、45Sc作为内标元素来校正基体带来的干扰。方法的检出限在0.36～1.64μg/kg,加标回收率在84%～111%之间,精密度RSD在1.6%～7.6%(n=5)之间。采用该方法对茶叶标准样品(GBW10016)和苹果标准样品(GBW10019)进行验证,测定值均在保证值范围内。本方法具有快速、准确、可靠、灵敏度高。     

微波消解-ICP-MS检测纺织材料中6种有害元素总量

探讨了微波消解-电感耦合等离子体质谱法(ICP-MS)同时测定纺织材料中6种重金属总量的方法。采用硝酸-双氧水体系优化了微波消解条件,同时测定了纺织品及其装饰材料中的Sb、As、Cd、Cr、Ba和Pb总量。测定的6种重金属总量在12.5～200.0μg/L时呈良好的线性关系;相关系数均不小于0.999 6,加标回收率为93.40%～100.05%,相对标准偏差为1.8%～4.7%,6种重金属的检出限和定量限分别为0.07～0.22μg/L和0.23～0.73μg/L。该方法在精密度、准确度和灵敏度方面均能满足日益严苛的相关实验标准要求,可实现多元素同时分析,有效提高检测效率,为纺织材料中重金属总量的检测提供技术储备。     

Review of techniques to manufacture micro-hydrogel particles for the food industry and their applications

Microgels are ‘soft’ microscopic cross-linked polymeric particles that are being increasingly exploited in a variety of industries for rheology control, encapsulation and targeted delivery. They are valued because of the ability to tune their functionality to address specific applications in oil recovery, coatings, drug delivery, cosmetics, personal care and foods. Food microgels are typically biopolymer hydrogels in the form of microspheres, nanospheres (also called nanogels), spheroids and fibres. The utilisation of engineered microgels in foods has so far been limited, despite their great potential to address several needs in the food industry, including: satiety control, encapsulation of phytonutrients and prebiotics, texture control for healthier food formulations (e.g. reduced fat products), and targeting delivery to specific areas in the digestive tract. We review the scientific and patent literature on the utilisation and manufacturing methods for producing microgels with an emphasis on micro-hydrogels for food applications.     

12—A CRITIQUE OF SOME HYPOTHESES RELATING TO THE HETEROGENEITY OF THE HIGH-SULPHUR PROTEINS OF WOOL

Joubert and Burns prepared a large number of fractions from the high-sulphur proteins of wool and estimated their molecular weights and amino-acid compositions. Their data have been re-examined in order to look for statistically significant interrelations between amino acids and between the proportion of various amino acids and molecular weight. Statistical analysis of the data is also used to examine the credibility of some hypotheses concerning the mechanism of keratin biosynthesis and to provide further evidence for the existence of families of proteins within the high-sulphur fractions of wool.     

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 Latest Data about Development of Chinese Printing Industry in 2013

In the 2014 China（Shanghai）International Printing Week,Director Wang Yanbin released the latest data about development of Chinese printing industry in 2013.According to statistics,in 2013,the total output value of Chinese printing industry exceeded 1trillion Yuan for the first time,reaching 1.03985 trillion Yuan.There were 105,000 printing enterprises in China,employees were 3.415 million.The total asset was 1.06247 trillion Yuan;     

The State Council Issued "Directory of Government Approved Investment Projects(2013 Edition)"

正On December 2nd,2013,the State Council issued the notification of"Directory of Government Approved Investment Projects(2013 Edition)"(hereafter referred to as"notification").It is pointed out in the"notification"that in order to further deepen reforms in investment systems and administrative examination and approval systems,simplify administrative procedures and delegate powers to lower levels,earnestly     

Top Ten News of China's Paper Industry 2013

On December 24th, 2013, the meeting on the selection of top 10 news of China＇s paper industry 2013 sponsored by 〈China Paper Newsletters〉 was held in Beijing. The yearly selection of the top l0 news, which began in 2000, has become a brand activity widely recognized in the industry thanks to the support from the authorities at all levels and public participation.     

National Development and Reform Commission Issued Announcement for Selection of Major Preliminary Research Projects for the "13~(th) Five-Year Plan"

In Apri Commi major p Plan＂ （h 2014, the National Development and Reform ssion issued an announcement for selection of reliminary research projects for the ＂13th Five-Year ereafter referred to as ＂The Announcement＂）     

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 latest scientific     

China textile machinery: taking off in progress

正Among the 1600 exhibitors who take apart in the ITMA ASIA+CITME2014 2/3 are Chinese manufactures.If the numerous figures failed to attract your attention,the increase of quality should draw your focus.To adopt the demand of developing textile machine market,domestic textile machinery enterprises now follow the slogan of"technology drives development"to enhance product competitiveness.Our domestic sellers will showcase product ranging from spinning,weaving,dyeing and printing,     

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.