甲醛

And no longer be used as a food additive in food. The use of "formaldehyde sulfoxylate" can improve the appearance and taste of food.

事件 龙口粉丝被查出甲醛次硫酸氢钠专家介绍，&甲醛次硫酸氢钠&是一种有毒的工业用漂白剂，对人体有严重的毒副作用，国家严禁将其作为食品添加剂在食品中使用。

Fans into formaldehyde sulfoxylate can make it tough, Smoothness and delicious, not white.

使用&甲醛次硫酸氢钠&能改善食品的外观和口感，粉丝放入甲醛次硫酸氢钠可使其变得韧性好、爽滑可口、不易煮烂。

Methods: in the light of the introduction of national standards "The analytical methods of zymolytic alcohol healthful standard" measured formaldehyde content of the food; and according as the national standard methods of measuring sulfur dioxide content of the food to determine food formaldehyde or sodium formaldehyde sulfoxylate content.

参照采用国家标准《发酵酒卫生标准的分析方法》，测定食品中甲醛的含量；再按国家标准方法测定食品中二氧化硫的含量，以判断食品中甲醛或吊白块的含量。

The adsorption behaviour of chemically different superplasticizers, such as melamine formaldehyde sulphite polycondensate,β-naphthalene sulfonate formaldehyde polycondensate and polycarboxylate, on early hydrating cement phases was studied. For this purpose, pure ettringite AF(subscript t, monosulfate AF(subscript m and syngenite were prepared. The adsorbed amount and zeta potential of early hydration products were measured.

制备了钙矾石AF(下标 t、单硫型硫铝酸钙AF(下标 m和钾长石类单矿物，并研究了三聚氰胺磺酸盐甲醛缩聚物、β-萘磺酸盐甲醛缩合物及聚发酸盐等几种化学成分不同的超塑化剂在其早期水化颗粒表面上的吸附行为。

By using isopropyl benzene as the internal standard material, using Agilent 1100 HPLC, using methanol-acetonitrile-water as mobile phase ,using three-component grade elution program, the components that contain benzene such as TALD,PT,4-CBA,TA,BA,PX and internal standard material isopropyl benzene in liquid phase product was analysed. Shimazu6A GC was used to analyse the solvent acetic acid and internal standard material isopropyl benzne in liquid phase.

以异丙苯为内标物，应用Agilent1100高效液相色谱仪，用甲醇－乙腈－水为流动相，采用三元梯度洗脱程序分析液相产物中的含苯环组分对甲基苯甲醛、对甲基苯甲酸、对羧基苯甲醛、对苯二甲酸、苯甲酸、对二甲苯和内标物异丙苯，应用Shimazu6A气相色谱仪分析液相中的溶剂醋酸和内标物异丙苯。

Therefore, with integrated consideration of the situations mentioned above, if the cathode reaction could be sufficiently utilized, preparation of benzaldehyde and tolualdehyde from toluene and xylene by electrooxidation with Ce /Ce as oxidative media would be more advantageous.

因此，综合考虑上述情况，若能充分利用阴极反应，选择Ce／Ce为氧化媒质，间接电氧化甲苯或二甲苯制备苯甲醛和甲基苯甲醛将更加有利。

Process Overview Yunnan Yuntianhua Inc. POM device of its kind in the Department of Taiwan's first device, process packets from Poland ZAT introduction, using POM techniques.

工艺简介云南云天化股份有限公司的聚甲醛装置系国内第一套同类型装置，工艺包从波兰ZAT引进，采用共聚甲醛技术。

The uron content was determined and the effects of pH value, temperature, reaction cycle and catalyst species on the Uron content were also discussed by FTIR quantitative analysis by uronizing urea-formaldehyde derivatives at the beginning of the reaction before the synthesis of UF resin.

采用在脲醛树脂合成初期对尿素－甲醛衍生物进行Uron化反应后，再进行UF树脂合成的技术方法，通过FTIR定量分析，研究了不同pH值、反应温度、反应时间及催化剂种类对尿素与甲醛成环化反应的Uron相对值的影响。

A one-step method for the synthesis of aromatic indolizine derivatives byintramolecular 1,5-dipolar cyclization reaction of 2-(2-arylethenyl)pyridinium N-ylidesin the presence of an oxidant has been studied for the first time. In the presence ofelectron-deficient olefins, however, 2-(2-phenylethenyl)pyridinium N-ylides underwent1,3-dipolar cycloadditions and then aromatized in situ by TPCD to produce indolizinederivatives, indicating 1,3-dipolar cycloaddition proceed more readily than 1 ,5-dipolarcyclization in these conditions. Pyridinium disubstituted N-ylides, readily obtainedfrom corresponding pridinium and β-chlorovinyl ketone, underwent thermalintramolecular 1,5-dipolar cyclization to give indolizine derivatives easily.Indolizinecarbaldehyde derivatives were synthesized starting from 2-pyridinecarbaldehyde in four-steps involving 1,3-dipolar cycloaddition reaction.

本文首次研究了2-(2-芳基乙烯基)吡啶N-叶立德在氧化剂存在下的分子内1，5-偶极环化反应，采用一锅法合成了中氮茚衍生物；研究了这些N-叶立德的1，5-偶极环化和1，3-偶极环加成反应的选择性，发现当有缺电子烯烃存在时，优先进行1，3-偶极环加成反应，而不再发生分子内1，5-偶极环化反应；由β-氯乙烯酮方便地得到了烯丙基N-叶立德，他们在加热时进行分子内1，5-偶极环化反应而得到中氮茚衍生物；由2-吡啶甲醛为起始原料，通过1，3-偶极环加成反应等四步反应，得到了重要的中氮茚甲醛衍生物，这些反应都具有条件温和和操作简便的特点，是合成中氮茚衍生物的新方法。

Based on the research of the liquid agent to eliminate the effect of the elimination of formaldehyde and impregnating agent Solid eliminate the production and absorption effects of formaldehyde.

本文主要研究了液体消除剂消除甲醛的效果及浸渍型固体消除剂的制作和吸收甲醛效果。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。