查询词典 acetic acid

In order to research and evaluate the safety of food packaging of plasticizer Di-2-ethylhexyl phthalatein PVC film, the migration rate of DEHP from PVC film into water food simulants (distilled water, 65% aqueous ethanol, 20% aqueous ethanol, 4% aqueous acetic acid) was studied at 17, 30, 40, 50 and 60℃ by Gas Chromatography.

为了研究评判PVC膜中增塑剂邻苯二甲酸二异辛酯在食品包装中的安全性，采用气相色谱仪测试了几种水性溶剂（蒸馏水、65%乙醇、20%乙醇、4%乙酸）在不同温度（17℃、30℃、40℃、50℃、60℃）下对PVC膜中增塑剂DEHP的溶出率。

Then, the prepared PET flakes were immerged into four kinds of food simulants (including n-hexane, 15% ethyl alcohol, 3% acetic acid and water).

而后，分别用4种食品模拟液（正己烷、15%乙醇、3%醋酸和蒸馏水）浸泡制备好的PET薄片。

The results show that DEHP can migrate into all water food simulants from PVC film and the migration rate was the highest in 65% aqueous ethanol with the range 0.85%～6.31% and a big increasing amplitude when contacting temperature over 30℃, the rate was lower in 20% aqueous ethanol and distilled water with the range 0.19%～0.45% and 0.19%～0.37%, respectively; and the rate was the lowest in 4% aqueous acetic acid with the picked out rate 17% and the value ＜0.4%.

研究结果表明，PVC膜中DEHP在几种水性溶剂中均有溶出，在65%乙醇中溶出率最大，范围为0.85%～6.31%，当浸泡温度超出30℃后，溶出率增幅较大；在20%乙醇和蒸馏水中的溶出率较小，范围为0.19%～0.45%和0.19%～0.37%；4%乙酸对DEHP的溶出作用最小，70个样品中，检出率为17%，检出溶出率。4%。

The effects of the content of acetic acid or water in mobile phase, temperature, sample loading and flow rate on the separation were systematically investigated. The fast enantioseparation of these two racemates on monolithic columns were successfully realized.

考察了流动相中添加不同浓度的醋酸和水、温度、进样量以及流速对分离的影响，在这两种整体柱上实现了对其消旋体的快速分离。

Today, the acetic acid bacteria are classified as the consensus result of a polyphasic analysis, combining phenotypic, chemotaxonomic and genotypic data.

如今， 大多采用结合表型、化学分类法和基因型数据的多相分类法对醋酸菌进行分类。

In a batch experiment of wet air oxidation of acetic acid with pelletized Ru/ZrO2-CeO2, chemical oxygen demand removal was 98%.

新方法制备的催化剂Ru/ZrO2-CeO2催化湿式氧化乙酸具有良好的活性，化学需氧量去除率为98%。

On the basis of surveying the resource, characteristic and treatment approaches inside and outside of the country of printing and dyeing wastewater, reaction which natrium chlorate oxidates directly with acetic acid to synthesize modified polymerized ferric sulphate decoloring agent is studied systematically in this paper .

本文在阐述印染废水的来源、特征及国内外各种印染废水处理方法的基础上。

During each production procedure of grape wine, acetic acid bacteria contamination easily occurs.

在葡萄酒生产过程的各个环节都可能受到醋酸菌的污染。

For better use of freshwater pearls, extraction technology of pH 3.0 acetic acid and sodium acetate in water was studied.

为更好的利用淡水珍珠中的功能成分，减少提取过程中对蛋白等成分的影响。

Procedure In a 1-l. round-bottomed flask are placed 250 cc. of glacial acetic acid, 15 g.

程序 在1升。圆桌会议触底烧瓶置于250毫升。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。