微波溶样ICP-MS直接测定茶叶中15种痕量稀土元素

本文报道用ＨＮＯ３－Ｈ２Ｏ２微波溶样，不经分离富集，用标准加入ＩＣＰ－ＭＳ法，直接测定茶叶中１５种痕量稀土元素．对微波溶样和等离子体质谱测定条件进行了优化选择．在最佳实验条件下，用本法测定了国家一级茶叶标准物质ＧＢＷ０７６０５中的单一稀土元素，测得值与标准值很好吻合     

微波溶样-分光光度法测定螺旋藻中的碘

用微波溶样－分光光度法测定螺旋藻中的碘,溶样快速,简单,安全。ＲＳＤ２．４％￣４．１％,回收率９７．１％￣１０３．３％。     

高压消解-火焰原子吸收光谱法测定大米中痕量铅铬镉镍和钴

采用高压溶样弹，将样品用硝酸－过氧化氢溶解后，用FAAS法对大米中铅、铬、镉、镍和钴测定，回收率为96％－103％，RSD分别为2.7%、3.1%、4.3%、3.9%和1.8%。应用于出口大米检测，取得满意的结果。     

微波辅助萃取-气相色谱-质谱法测定大气可吸入颗粒物中痕量多环芳烃

建立了微波辅助萃取－气相色谱－质谱联用测定大气可吸入颗粒物中痕量多环芳烃（PAHs）的分析方法，优化了萃取时间、溶剂用量、微波辐射功率等微波萃取条件，并与超声波萃取方法进行了对照研究。结果表明：除了苊、芴外，微波萃取方法的回收率在85％－130％之间；方法的检出限在0.002-0.016μg/m^3之间。通过实际样品中PAHs的分析表明，该法快速、溶剂用量小，满足痕量分析的要求。     

微波溶样ICP—MS直接测定茶叶中15种前量稀土元素

本文报道用ＨＮＯ３－Ｈ２Ｏ２微波溶样，不经分离富集，用标准加入ＩＣＰ－ＭＳ法，直接测定茶叶中１５种痕量稀土元素，对微波溶样和等离子体质谱测定条件进行了优化选择，在最佳实验条件下，用本法测定了国家一级茶叶标准ＧＢＷ０７６０５中的单一稀土元素，测得值与标准值很好吻合。     

微波溶样－ICP－AES法测定人发标准物质中15种超痕量稀土元素的研究

本文采用微波溶样，不经分离富集，直接用标准加入ＩＣＰ－ＭＳ法，测定人发标准物质中１５种超痕量稀土元素。选择了最佳样品预处理条件和测定的最佳仪器参数。检出限为０．００７～０．０２６ｎｇ／ｍＬ。用国家一级土壤标准物质（ＧＢＷ０７４０１和ＧＢＷ０７４０３）作为质控样，１５种痕量稀土元素的测得值与标准值很好地吻合，相对标准偏差（ＲＳＤ）为１．２％～５．４％。国家一级人发标准物质（ＧＢＷ０７６０１）中稀土元素的标准值仅有Ｌａ，Ｃｅ和Ｙ，本法测得值均落在标准值的置信区间内。其余１２个超痕量稀土元素本法也取得了较为满意的结果。     

微波消解-分光光度法测定石油焦中的钒

研究了用微波消解分光光度法测定石油焦中的钒。在石油焦样品处理中采用了常规溶样及微波消解两种方法。重点研究了微波消解石油焦样品的方法，详细考察了微波消解时样品的最佳用量、消解压力、功率、时间，建立了最佳微波消解程序。结果表明两种方法测定结果基本吻合。样品测定的RSD小于4、02％，加标回收率均在98．6％～102．7％之间，但微波消解法的溶样速度是常规法的10倍。钒的线性范围为0～8．0g／L。结果表明，微波消解分光光度法测定石油焦中的钒是一种快速、准确且无环境污染的方法。     

微波消解-分光光度法测定石油焦中的硅

重点研究了微波消解石油焦样品的方法,详细考察了微波消解时样品的最佳用量、消解压力、消解功率、消解时间,建立了最佳微波消解程序：在样品处理中也采用了常规溶样方法,并分别用两种样品处理方法测定石油焦中的硅。结果表明两种方法测定结果基本吻合,样品测定的RSD小于3．85％,加标回收率在97％～103％之间,但微波消解法的溶样速度是常规法的10倍。实验结果表明,微波消解分光光度法测定石油焦中的硅是一种快速、准确且无环境污染的绿色环保方法,具有一定的实用价值。     

微波溶样—ICP—AES法测定人发标准物质中15种超痕量稀土元素的研究

本文采用微波溶样，不经分离富集，直接用标准加入ＩＣＰ－ＭＳ法，测定人发标准物质１５种超痕量稀土。选择了最佳样品预处理条件和测定的最佳仪器参数。     

声明

本公司在2005年2月的广告中，在公司署名后加注：“原新科微波溶样测试技术研究所”，损害了上海懋华电子工程开发中心新科微波溶样测试技术研究所的合法权益。本公司特此声明：本公司与懋华电子工程开发中心新科微波溶样测试技术研究所无承继关系，对上述广告可能引起的误认，予以澄清。     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Cu0-catalysed 1,3-dipolar cycloadditions of α-amino acid derived N,N-cyclic azomethine imines to ynones

A series of 20 CuAIAC reactions between eight 4-acylamino substituted pyrazolidine-3-one-1-azomethine imines and four terminal ynones were performed using Cu⁰ as catalyst. The corresponding fluorescent cycloadducts were obtained in very high yields upon simple workup. Thus, Cu-metal turned out to be a better catalyst than Cu^I in terms of yield and ease of isolation. Availability of azomethine imines, mild reaction conditions, and simple workup enable a “click” access to libraries of densely substituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-ones. Reactivity of differently substituted dipoles was evaluated experimentally and by quantum chemical methods (DFT).     

Synthesis and antioxidative/anti-inflammatory activity of novel fullerene–polyamine conjugates

(E)-4-(Fullerenopyrrolidin-1-yl)-3-methylbut-2-enoic acid and its corresponding succinimidyl ester, readily obtained through Prato-type modification of C₆₀, were used for the selective N-acylation of polyamines. The thus obtained conjugates were evaluated for their antioxidative and anti-inflammatory activity and their cytotoxicity was determined. Members of this family of compounds showed interesting anti-lipid peroxidation, anti-lipoxygenase and anti-inflammatory activity and comparable cytocompatibility to spermidine.