甲醛

The method has been used to determine Phthalic esters in drinking water and seawater sample. 3. Single drop microextraction, followed by gas chromatography with flame ionization detection has been applied to determine Formaldehyde, Acetaldehyde and Acraldehyde in water based on 2,4-Dinitrophenylhydrazine derivatization. Extraction solvent, extraction time and stirrer speed were optimized. Optimal experimental conditions were as follows: 1.6μL toluene microdrop exposed for 30 min in a 3ml aqueous sample placed in 4ml vial and stirred at 600 rpm/min.

以2，4-二硝基苯肼衍生，单滴液相微萃取与气相色谱火焰光度检测器联用测定水样中的甲醛、乙醛、丙烯醛，考察了萃取溶剂、液滴大小、萃取时间、搅拌速度、盐效应等对该方法的影响，并对影响液相微萃取的各种因素进行了系统的阐述，确定了该体系的最佳实验条件，实现了甲醛、乙醛、丙烯醛的提取和富集。

Product characteristics : Formaldehyde-scavenger is produced through advanced technics and composition.

甲醛清除剂产品特性：本产品是采用科学配方，先进的生产工艺，生产出的甲醛清除剂。

The result showed that high quality genomic DNA could be got from both fresh and frozen tissues except scale by common method. Tissue fixed with 70% alcohol and 10% formaldehyde could also extract high quality genomic DNA after effective pretreatment. Noteworthy high quality DNA could be got from scale with fresh and some other fixation methods.

结果表明，除鳞片外，新鲜组织、-20℃冰冻组织以常规方法可提取出较高质量的DNA；保存于70%酒精或10%甲醛溶液中的组织，经预处理，亦可得高质量DNA；新鲜、冰冻、70%酒精或短时间10%甲醛固定的鳞片经适当预处理也可提取出较高质量的DNA。

The paper surveyed the natural contents of formaldehyde in common aquatic products and conducted a risk assessment on it by the method of CAC. The results showed that the content of formaldehyde in most aquatic products was low, apart from Bombay duck and shredded squid.

为了查明水产品中天然甲醛的含量水平及其对人体的健康风险，研究了常见水产品中的甲醛天然含量，参照CAC的方法对其进行了健康风险评估。

They sign contract with the new-founded Bonnier and record their first single "Opa Opa" which was a smash hit (went gold and stayed many weeks in the no 1 of the singles charts).

他們簽署的合同與新成立邦尼爾和記錄他們的第一首單曲"甲醛甲醛"這是一個紅極一時（去黃金和留在許多個星期沒有1單打圖表）。

The method is based on the catalytic effect of trace formaldehyde on the reaction between potassium bromate and Azur A .

研究了在H2SO4介质中，微量甲醛对KBrO3氧化天青A 有较强的催化作用，建立了催化光度法测定微量甲醛的新方法。

Based on the catalytic effects of trace formaldehyde on the reaction between potassium bromate and oxidized azur A,a new catalytic spectrophotometric method has been developed in this paper.

基于在一定温度和硫酸介质中，痕量甲醛对溴酸钾氧化天青A 有较强的催化作用，建立了测定痕量甲醛的新的催化光度法。

The radiation by non-thermal plasma can accelerate formaldehyde thansform and make an increase of 29.61% in depurated efficiency. The surface modification makes no obvious difference in depurated efficiency. The chemical modification avails formaldehyde reduction and ACF coated with nano- TiO2 is the best of all that can enhand the depurated efficiency to 94%. The great influence of parameters on depurated efficiency , such as applied voltage and reaction time , shows that an increase in either applied voltage or reaction time enhance formaldehyde conversion.

研究结果表明：低温等离子体辐射能促进甲醛净化，可使其净化效率提高29.61%；表面改性对净化效率没有明显影响；化学改性有利于甲醛净化，其中负载纳米TiO2改性方案最佳，其净化效率高达94%；电源电压和反应时间等参数对净化效率也有较大影响，电压越大，时间越长就越有利于甲醛的去除。

Experiment finds that melamine formaldehyde resin could reduce the ramie fiber's water absorption.But it usually has low storage stability.For improving the storage stability,the property of Melamine formaldehyde resin is modified by polyvinyl alcohol.

实验发现，三聚氰胺甲醛树脂可降低苎麻纤维的吸水率，但三聚氰胺甲醛树脂存放稳定性差，加入聚乙烯醇进行改性可显著改善三聚氰胺甲醛树脂的贮存稳定性。

The further analysis indicated that the double gene transgenic petunia possessed stronger capacity to take up liquid formaldehyde than the control and the single gene, DAS or DAK, transgenic plants. This resuLt suggests that the expressed DAS and DAK might establish aHCHO-fixation pathway which functions in the double gene transgenic plants.

对液体甲醛吸收速率测定结果表明转DAS、DAK双基因的矮牵牛对甲醛的吸收速率明显快于对照植物和转单个基因DAS或DAK的植物，说明转基因表达产生的DAS、DAK可能构成一条甲醛固定途径，在转双基因植物中发挥作用。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐