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因AES而产生的二恶烷会致癌吗？Does dioxane generated from AES cause cancer?

在二氧六环中它们的量子产率为0.4左右。Their quantum yields were about 0.4 in dioxane.

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样品用适量的水提取，将二恶烷完全溶解。The cosmetics were extracted with water and dioxane was dissolved completely.

但对于微量二恶烷是否对儿童皮肤造成伤害，强生并未明确回复。But it failed to say if the small amount of dioxane in the products is harmful to children's skin.

包括我国在内的许多国家对洗发水、化妆品中所含的二恶烷并未作出限量规定。Many countries including China have no standards limiting the amount of dioxane in shampoo and cosmetics.

在二氧六环的解决办法是通过蒸发浓缩和剩余油是在真空中蒸馏水上热水澡。The dioxane solution was concentrated by evaporation and the remaining oil was distilled in vacuo on a water bath.

二恶烷经常会在河水、特别是地下水中被检测到，这主要是由于挥发性的卤代碳氢化合物造成的污染。Dioxane has been frequently detected in river water, especially in ground water polluted by volatile halogenated hydrocarbons.

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1992年至1997年，曾有一些化妆品被发现含二恶烷79ppm，但FDA认为这种含量不会危害消费者。It found between 1992-1997 that the dioxane level of some cosmetics was 79 parts per million and considered it safe for customers.

推导了异戊二烯在环已烷-二氧六环混合溶剂中的负离子聚合机理，并通过实验进行了验证。The mechanism of anionic polymerization of isoprene with cyclohexane and dioxane as solvent was studied and improved by experiment.

在溶剂THF或二氧六环的存在下制得的苯乙烯-丙烯酸共聚物最适宜于合成高活性的载体钕络合物。The copolymers prepared by solution polymerization in THF or dioxane were better supporter for the synthesis of highly active supported catalyst.

本发明特别涉及具有两个四氢吡喃环或者具有至少各一个四氢吡喃环和二韧榛返幕合物。The invention also relates to, in particular, compounds having two tetrahydropyrane rings or at least one tetrahydropyrane ring and a dioxane ring.

确定了1，4-二氧六环中所含的杂质，对共沸精馏法分离及提纯1，4-二氧六环有重要指导价值。Impurities in the dioxane were determined. The analysis method has important directive value for separating and purifying 1, 4-dioxane with azeotropic rectification.

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结果表明，二氧六环木素与过氧化氢反应后的降解产物中羰基明显增多，而且生成了醌型物质。The results showed that carbonyl groups in degradation products obviously increased and quinoid matters were produced when dioxane lignin reacted with hydrogen peroxide.

但就常理推断，大多数情况下二恶烷应是在生产过程中微量残留于最终产品中的，而非主动添加。But common sense told us, in most cases micro-amount of residual dioxane should have been left in the end products in the production process, and was not intentionally added.

从现有的资料来看，美国、欧盟及我国均未对洗护用品及化妆品中二恶烷的残留量设立硬性指标。As shown by the existing information, USA, European Union and our country have not set rigid norm for the residual dioxane in shampoo and hair care products as well as cosmetics.

在25℃下，将二氧六环分配在苯相和水盐溶液相中，然后用干涉仪测定它在水相中的浓度。Small amount of dioxane is distributed between benzene and aqueous salt solutions at 25℃ and the concentration of dioxane in aqueous phase is determined by means of an interferometer.

测定了在水、乙醇、二氧六环中的紫外吸收光谱与克分子消光系数以及萤光光谱和量子产率。The ultraviolet absorption spectra and molar extinction coefficients, fluorescent spectra as well as quantum yields of nucleoside hydrazones in water, ethanol and dioxane were measured.