乙酸

Purified sucralose-6-acetate which had been recrystallized was hydrolyzed in th system of sodium methoxide/methanol solution, and the mixture was quenched with H+ ion exchange resin, and cake was washed with methanol. The eluate was concentrated to remove methanol and methyl acetate. The aqueous solution was decoloured with active carbon. The filtrate solution was concentrated and crystallized above 38℃for sever hours, the product sucralose was collected.

重结晶的三氯蔗糖-6-乙酸酯于CH3ONa/CH3OH体系中醇解，用H+型阳离子交换树脂中和，蒸去甲醇、乙酸甲酯等，在水相中用活性炭脱色，水溶液经浓缩，在38℃以上结晶数小时，分离得三氯蔗糖。

In the case of HAA2, optimised IC and MS parameters including eluent gradient, temperature and collision energy etc.

在优化的色谱和质谱条件下，二氯乙酸和三氯乙酸的检出限分别为0.053 μg/L和0.46 μg/L。

Moreover, the suggestions on development of domestic glycollic acid in the future are put forward also.

最后对羟基乙酸在国内外的生产现状进行分析，并对国内羟基乙酸今后的发展提出几点建议。

The dissociation constants and the reaction rate constants of inclusion complexes formed between α、β—cyclodextrin and several naphthyl esters (α—naphthyl acetate,β—naphthyl acetate,β—naphthyl caproate) were obtained by kinetics of hydrolyses of naphthyl esters.

通过几种脂肪酸萘酯(乙酸-α-萘酯、乙酸-β-萘酯、己酸-β-萘酯)的环糊精催化水解研究得到了它们同环糊精所形成的包接络合物的分解平衡常数和反应速度常数，进而提出了它们同环糊精所形成的包接络合物的结构模型。

In order to improve the thermal stability of yellow iron oxide pigments, a new balance precipitant coating silicon method with ethyl acetate as potential acid by controlling the dehydrolysis velocity of ethyl acetate was used.

为了改善铁黄颜料的耐热性，运用乙酸乙酯作为潜伏性酸试剂，研究了一种新的铁黄表面均匀包覆二氧化硅的方法，即通过控制乙酸乙酯的水解速率来实现在铁黄表面均匀包覆二氧化硅。

The major occupational hazards factors in printing ink were benzene, toluene, xylene, ethylbenzene, solvent gasoline, methanol, alcohol, isopropyl alcohol, ethyl acetate, butyl acetate, butyl acetate, dichloromethane, etc. 10 of 1224 samples (0.82%) exceeded the national occupational health standards.

印刷油墨中存在的职业病危害因素种类主要有苯、甲苯、二甲苯、乙苯、溶剂汽油、甲醇、乙醇、异丙醇、乙酸乙酯、乙酸丁酯、二氯甲烷等，检测样品总数1224件，超标样品数10件，超标率为0.82%。

Sample matrix are discharged by the pre-column. The mobile phases applied consisted of 0.1% HOAc (pH3.0) acetonitrile-water on extraction column with UV detection at 225nm. Then, coupled-column liquid chromatographic methods for the direct analysis of atrazine and simazine in urine was established. As a result, the system showed good chromatographic property in the on-line analysis of atrazine and simazine in urine.

使用该系统对尿中的莠去净和西玛津残留进行了分离分析，以含有0.1%乙酸的酸性水缓冲液对加标尿液中莠去净类化合物保留在预柱上，干扰分析的大分子被排阻而无保留通过，其它干扰分子保留小而通过，再切换六通阀，以乙腈和0.1%乙酸水溶液进行梯度洗脱，进而在下一级ODS分析柱上进行分离（紫外检测225nm），两种除草剂的分离分析取得了良好的定性定量结果

The indicators measured included pH value change, NH3-N change, LAB concentration, and silage deteriorations etc during fermentation of silages.

根据青贮饲料的质量及经济成本等综合考虑，在双乙酸钠和脱氢乙酸钠各自组中选取一个最佳浓度，作为玉米青贮试验的添加剂。

The effects of both molar ratio between reactants and reaction temperature on the products were investigated.

考察了乙酸铅和硫脲的摩尔比以及反应温度对合成产物的影响，发现当乙酸铅和硫脲的摩尔比为1：1时，得到大量的PbS纳米棒束，并初步探讨了其形成机理。

In optimal design procedure, two important design variable are identified: one is recycle flow rate and the other is specification of acetic acid in the distillate of second column (pinch point exists between water-acetic acid system).

在最适设计步骤中，我们发现两个最重要的变数：回流股流量及第二根塔顶乙酸规格(乙酸与水之间有狭点存在)。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新