三七生长初期不同部位微量元素的含量测定

采用电感耦合等离子体发射光谱法(ICP-AES),对文山地区GAP种植及农户常规种植的生长初期三七不同部位中的微量元素Mg、P、Ca、Mn、Na、Fe、Co、Cu、Zn、Mo、Cr、Ni、Ge、Se等14种元素进行了测定分析。结果表明,三七的根、茎、叶中含有丰富的人体必需Mg、P、Ca、Mn、Na、Fe、Co、Cu、Zn、Mo、Ge、Se等有益元素,且P、Ca、Mg、Fe含量较高,Na、Mn、Co、Zn次之,Co、Mo、Cr、Ni、Ge、Se含量均较低。为三七GAP栽培标准和特征制订、三七道地药材的化学特征——化学指纹图谱的建立及研究提供理论依据。     

ICP-AES法测定铜精矿中As、Sb、Bi、Ca、Mg、Pb、Co、Zn和Ni

提出采用ICP-AES法同时测定铜精矿中As、Sb、Bi、Ca、Mg、Pb、Zn、Ni、Co的分析方法:样品经王水 HF HClO4溶液后,直接测定。该方法测定As、Sb、Bi、Ca、Mg、Pb、Zn、Ni、Co的回收率在97.9%~102%之间,相对标准偏差在0.23%~2.5%之间。通过和国家标准物质比对及国家标准分析方法的比对,结果准确可靠,现该方法已用于本公司铜精矿的日常分析。     

蔬菜搭配与微量元素

人们都想了解和掌握必需微量元素和宏量元素含量配合较为均衡的蔬菜。根据专家们的研究发现,在人们食用的蔬菜中,含人体必需宏量元素和微量元素适量同时较为均衡的蔬菜有20多种,它们是：白萝卜、胡萝卜、小白菜、小青菜、油菜、蕹菜、白茱苔、蒜苗、油角豆、马兰头、韭菜、苦瓜、芪椰菜、莴苣笋（茎）、山药、芦笋、蒜苔、藕、红辣椒、青辣椒等,这些蔬菜所含的人体必需微量元素如：Fe、Me、Zn、Cu、Se等和人体必需宏量元素如K、Na、Ca、Mg等都是中等量,并且含量都是比较均衡,为人们日常调配饮食,购买、     

《色谱》投稿须知(2022)

《色谱》是中国化学会和中国科学院大连化学物理研究所主办、中国科学技术协会主管、国内外公开发行的专业性学术期刊,月刊。主要报道色谱学科的基础性研究成果、色谱及其交叉学科的重要应用成果及其进展,包括新方法、新技术、新仪器在各个领域的应用,色谱仪器与部件的研制和开发。被Medline、ESCI、CA、CSA、JST、AA、CHI、MSB-S、AJ、IC、SCOPUS等收录。曾入选百种中国杰出学术期刊、中国最具国际影响力学术期刊、中国科学院优秀期刊、中国科协优秀期刊、中文核心期刊、中国科技核心期刊、中国精品科技期刊、中国科协精品科技期刊工程项目。     

蔬菜搭配与微量元素

人们都想了解和食用必需微量元素和宏量元素含量配合较为均衡的蔬菜。根据研究发现,在人们食用的蔬菜中,含人体必需宏量元素和微量元素适量同时较为均衡的蔬菜有20多种,它们是：白萝卜、胡萝卜、小白菜、小青菜、油菜、蕹菜、白茱苔、蒜苗、油角豆、马兰头、韭菜、苦瓜、芪椰菜、莴苣笋（茎）、山药、芦笋、蒜苔、藕、红辣椒、青辣椒等,这些蔬菜所含的人体必需微量元素如：     

微波消解-电感耦合等离子体发射光谱法测定固体生物质燃料中8种元素

建立电感耦合等离子体发射光谱法同时测定固体生物质燃料中钾、钠、钙、镁、砷、铜、铁、锰8种元素的含量。样品采用5 mL硝酸溶液和2 mL过氧化氢溶液进行微波消解,在选定的仪器工作条件下进行测定。钠、钙、镁、砷、铜、铁、锰的质量浓度在0～5.0 mg/L,钾的质量浓度在0～50.0 mg/L范围内与光谱强度具有良好的线性关系,相关系数均大于0.999,方法检出限为0.002～0.022 mg/L。样品的加标回收率为91.9%～108.2%,测定结果的相对标准偏差为2.1%～6.8%(n=6)。该方法简便、快速、高效且准确,适用于固体生物质燃料中钾、钠、钙、镁、砷、铜、铁、锰的测定。     

2008年高考理综全国卷(Ⅰ)与卷(Ⅱ)化学试题的对比分析

2008年高考理综全国卷(Ⅰ),陕西、湖北、湖南、安徽、福建、浙江、辽宁、江西、广西、河北、山西、河南等省区采用;理综全国卷(Ⅱ),黑龙江、吉林、内蒙古、甘肃、青海、云南、贵州、新疆、西藏等省区采用.这2套试卷的化学试题难度有明显的差异,本文做一对比分析.     

欢迎订阅 欢迎投稿 欢迎刊登广告 《分析测试学报》

《分析测试学报》是由中国广州分析测试中心、中国分析测试协会共同主办的全国性学术刊物,中文核心期刊。刊登质谱学、光谱学、色谱学、波谱学、电化学、电子显微学等方面的分析测试新理论、新方法、新技术的研究成果,介绍新仪器装置及在生物、医药、化学化工、商检、食品检验等方     

电感耦合等离子体发射光谱法测定高纯稀散金属中杂质元素研究进展

综述了电感耦合等离子体发射光谱法测定高纯稀散金属中镓、铟、铊、锗、硒、碲、铼中杂质元素的研究进展,分析了样品测定过程与重点,分别对镓、铟、铊、锗、硒、碲、铼进行了介绍,重点讨论了基体的干扰和消除,并对测定高纯稀散金属中杂质元素的发展方向提出建议。     

2015年《分析测试学报》征订启事

《分析测试学报》是由中国广州分析测试中心、中国分析测试协会共同主办的全国性学术刊物,中文核心期刊。刊登质谱学、光谱学、色谱学、波谱学、电化学、电子显微学等方面的分析测试新理论、新方法、新技术的研究成果,介绍新仪器装置及在生物、医药、化学化工、商检、食品检验等方面实用性强的实验技术。适合科研院所、高等院校、检测机构、医药、卫生以及厂矿企业分析测试工作和管理人员     

A confirmatory method for the simultaneous extraction,separation, identification and quantification of Tetracycline,Sulphonamide, Trimethoprim and Dapsone residues in muscle by ultra-high-performance liquid chromatography–tandem mass spectrometry according to Commission Decision 2002/657/EC

A rapid confirmatory multi-residue method for the analysis of tetracyclines, sulphonamides, trimethoprim and dapsone by UPLC-MS/MS is described. The method is able to quantify and confirm the following 19 compounds, oxytetracycline, tetracycline, chlortetracycline, doxycycline, sulfadiazine, sulfathiazole, sulfapyridine, trimethoprim, sulfamerazine, sulfamethizole, sulfamethazine, sulfamethoxypyridazine, sulfamonomethoxine, sulfachlorpyridazine, dapsone, sulfamethoxazole, sulfisoxazole, sulfaquinoxaline and sulfadimethoxine. Samples are extracted with 0.1 M EDTA and acetonitrile, which is then evaporated under a stream of nitrogen and reconstituted in water. Following centrifugation and filtering, an aliquot is analysed by UPLC-MS/MS using positive electrospray ionisation and multiple reaction monitoring. The method is deemed rapid as all analytes are extracted by a single extraction technique, with no solid-phase extraction clean up required. Validation is according to Commission Decision 2002/657/EC and was carried out for bovine, porcine, ovine and poultry species. Specificity, recovery, repeatability, reproducibility, CCα and CCβ data is presented.     

致癌性多环芳烃萘、蒽、芘的分析方法比较

利用薄层色谱（TLC）、紫外光谱（UV）、反相高效液相色谱（RPHPLC）对多环芳烃（PAHs）萘、蒽、芘的分析方法进行了研究。TLC中使用环己烷：氯仿（5：4,V／V）作为展开剂时,三者的R,值分别为0．78、0．65和0．72;用UV法在溶液中测定了三者的最大吸收波长分别为303、380、338nm;当流动相为甲醇：水（9：1,V／V）时三者在RP—HPLC中的保留时间为4．179、5．190、6．178min,5次重复RSD分别为1．1％、1．8％、0．91％,并用于实际水样中萘、蒽、芘的分析。     

MORPHOLOGY EVOLUTION IN PTFE AS A FUNCTION OF MELT TIME AND TEMPERATURE Ⅱ. LOW MOLECULAR WEIGHT FOLDED CHAIN SINGLE CRYSTALS AND BAND STRUCTURES

The effect of sintering dispersed and bulk, low molecular weight (Mn = 50,000 Da), nano-emulsion polytetrafluoroethylene (PTFE) particles near their melting point is described. With the nascent particles consisting of ca.75 nm diameter, hexagonal, single crystals, sintering at, e.g., 350℃, results, initially, in merger of neighboring particles,followed by individual molecular motion on the substrate and the formation of folded chain, lamellar single crystals and spherulites, and on-edge ribbons. It is suggested these structures develop, with time, in the mesomorphic "melt". Sintering of the bulk resin yields extended chain, band structures, as well as folded chain lamellae; end-surface to end-surface merger,possibly by end-to-end polymerization, occurs with increasing time.     

Inorganic arsenic: A dangerous enigma for mankind

Human being have been using inorganic arsenic for a long time. Many reports on arsenic poisoning have been published: eg case reports, examination reports, post mortem reports, and epidemiological studies. Several aspects and features of arsenic poisoning are discussed in this report. Methods of inferring arsenic-related disease, disease classification according to acute or chronic criteria, exposure route, interaction, confounding factors, and the oxidation state of arsenic are all discussed. The effects of arsenic are classified into skin, respiratory system, gastrointestinal tract, liver, cardiovascular system, nervous system, and bone marrow effects. Carcinogenicity is an important chronic effect of arsenic poisoning, so special attention is paid to it in this review. In Japan, there have been many incidents of arsenic poisoning. In this review, we often use data from these cases, such as the Morinaga powdered-milk poisoning case, the Ube soy-sauce poisoning case, the Toroku mine incident, and the Nakajo well-water poisoning case. We emphasize here the necessity of planning follow-up studies and total health care for patients exposed to arsenic.     

Determination of the Pesticides Alachlor,Anilazine, Bromoxynil,and Dichlobenil by Low Temperature Phosphorimetry

Abstract

Sensitive low temperature phosphorimetric methods for the determination of the pesticides Alachlor, Anilazine, Bromoxynil, and Dichlobenil in EPA solvent have been developed. The minimum detectable amounts are 0.08, 0.006, 0.2, and 0.006 p.p.m. for Alachlor, Anilazine, Bromoxynil, and Dichlobenil respectively. The ranges in linearity of the analytical calibration graphs are 0.01–5, 0.2–7.5, and 0.03–20 p.p.m. for Anilazine, Bromoxynil, and Dichlobenil respectively. The analytical calibration graph for Alachlor is linear from 0.3 to 10 p.p.m. and with a different slope, linear from 10 to 50 p.p.m. The procedure for Alachlor has been applied to the analys of a solid commercial formulation.     

铋系超导体组成分析

本文首次提出了一种离子交换柱分离——滴定法测定Bi系超导体中Bi、Pb、Cu、Ca和Sr含量的方法。研究了进样条件和淋洗方法,特别是Bi~(3+)在微酸性溶液中的亚稳态进样。测定合成样品时,Bi、Pb、Cu、Ca和Sr的相对标准偏差分别为0.7％、1.6％、0.5％、0.4％和0.2％。分析了超导体样品,并测定了其中Cu~(3+)。     

Three types of reactions with intramolecular five-membered ring compounds in organic synthesis

There are three types of reactions with intramolecular five-membered ring compounds in organic syntheses: The first type is reactions involving intramolecular five-membered ring compounds which are utilized for the ease of synthesis of these compounds and the stability of the products. The second is reactions performed via intramolecular five-membered ring intermediates, because such intermediates are very reactive and labile compounds. The third is the metal-catalyzed reactions with the intramolecular five-membered ring compounds because these metal compounds have catalytic activities. The third type reactions involving intramolecular five-membered ring pincer compounds are also provided.The first type reactions include carbonylations, alkenylations, alkynylations, acylations, isocyanations, Diels-Alder reactions, etc. The second type reactions include carbonylations, cross-coupling reactions, hydroacylations, ring expansion reactions, carbocyclizations, etc. The third type reactions include cross-coupling reactions, rearrangements, metatheses, reductions, Michael reactions, dehydrogenations, Diels-Alder reactions, etc.     

Simultaneous analysis of pesticides from different chemical classes by using a derivatisation step and gas chromatography-mass spectrometry

This work presents a new method to analyse simultaneously by GC–MS 31 pesticides from different chemical classes (2,4 D, 2,4 MCPA, alphacypermethrin, bifenthrin, bromoxynil, buprofezin, carbaryl, carbofuran, clopyralid, cyprodinil, deltamethrin dicamba, dichlobenil, dichlorprop, diflufenican, diuron, fenoxaprop, flazasulfuron, fluroxypyr, ioxynil, isoxaben, mecoprop-P, myclobutanil, oryzalin, oxadiazon, picloram, tau-fluvalinate tebuconazole, triclopyr, trifluralin and trinexapac-p-ethyl). This GC–MS method will be applied to the analysis of passive samplers (Tenax^® tubes and SPME fiber) used for the evaluation of the indoor and outdoor atmospheric contamination by non-agricultural pesticides. The method involves a derivatisation step for thermo-labile or polar pesticides. Different agents were tested and MtBSTFA (N-(t-butyldimethylsilyl)-N-methyltrifluoroacetamide), a sylilation agent producing very specific fragments [M−57], was retained. However, diuron could not be derivatised and the isocyanate product was used for identification and quantification. Pesticides which did not need a derivatisation step were not affected by the presence of the derivatisation agent and they could easily be analysed in mixture with derivatised pesticides. The method can be coupled to a thermal-desorption unit or to SPME extraction for a multiresidue analysis of various pesticides in atmospheric samples.     

Traditional uses,phytochemistry, pharmacology and other potential applications of Vitellaria paradoxa Gaertn. (Sapotaceae): A review

Vitellaria paradoxa Gaertn. is a multipurpose medicinal plant of the family Sapotaceae, and it has been widely used usually in the clinical traditional medicine as remedy for a wide range of diseases for several decades. In addition, the plant has also found applications in confectionery, cosmetics and soaps, and pharmaceuticals both locally and internationally. V. paradoxa, which has been identified with >150 phytoconstituents, is rich in oleanane-type triterpene acids and glycosides, such as paradoxosides A-E, tieghemelin A, parkiosides A-C, bassic acid, as well as flavonoids such as quercetin and catechin-type compounds. The extracts and the active constituents of V. paradoxa have been investigated for various pharmacological activities, including but not limited to anticancer, melanogenesis-inhibitory, antibacterial, anti-diabetic, antioxidant, anti-inflammatory, anti-diarrhoeal, and antifungal activities. Additionally, V. paradoxa has also been utilized in nanoparticles (NPs) synthesis. These NPs among other things have shown significant antinociceptive and antiedematogenic activities as well as environmental friendly adsorptive properties for the removal of pollutants from pharmaceutical effluents. Overall, this review comprehensively examines the traditional uses, phytochemistry, pharmacology, toxicology, clinical studies, and nanoparticles synthesized from V. paradoxa and their applications.     

From halo-azasilylenes to halo-phosphasilylenes (X-CNSi vs. X-CPSi) at ab initio and DFT levels

The higher the electropositivity of the substituents has been associated with the higher possibility of encountering a triplet ground state silylene [P.P. Gaspar, M. Xiao, D. Ho Pae, D.J. Berger, T. Haile, T. Chen, D. Lei, W.R. Winchester, P. Jiang, J. Organomet. Chem. 646 (2002) 68]. Here, going from the reported halo-azasilylenes X-CNSi [M.Z. Kassaee, S.M. Musavi, H. Hamadi, M. Ghambarian, S.E. Hosseini, J. Mol. Struct. (Theochem) 730 (2005) 33] to the analogues more electropositively substituted halo-phosphasilylenes X-CPSi has reduced the chances of encountering triplet ground state silylenes (X = H, F, Cl and Br). Even though all singlet isomers seem to be more stable than their corresponding triplets, singlet-triplet cross over diagrams may help the future design of new acyclic triplet state silylenes.