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化学:论文文摘:
The primary goals finished in 1999 were as follows: the gross adjustment and controlling had been put in force
该年度的重点工作是:总量调控措施基本到位
属类：化学及生命科学-化学-论文文摘
the market condition had gotten better largely
市场环境明显改善
属类：化学及生命科学-化学-论文文摘
the lesser refineries had been put into order gradually
清理整顿小炼油厂工作取得阶段性进展
属类：化学及生命科学-化学-论文文摘
Ultrasonic extraction and gas chromatography-mass spectrometry(GC-MS)have been used to analyze 18 preservatives in cosmetics such as benzyl alcohol, 3-methyl-4-isopropylphenol, butylparaben, 2-benzyl-4-chlorophenol, etc.
采用超声抽提法对化妆品中的苯甲醇、3-甲基-4-异丙基苯酚、对羟基苯甲酸丁酯和2-苄基-4-氯酚等18种防腐剂进行了气相色谱-质谱法(GC-MS)测定的研究。
属类：化学及生命科学-化学-论文文摘
A simple, rapid and accurate method for the determination of preservatives in cosmetics has been established.
建立了一种简单、快速、准确测定化妆品中各种防腐剂的测定方法。
属类：化学及生命科学-化学-论文文摘
Ultrasonic extraction durations and solvents were selected. Linearity, recovery, precision were determined.
进行了样品提取溶剂和超声提取时间选择以及线性、回收率、精密度试验。
属类：化学及生命科学-化学-论文文摘
Tracking Analysis of Changes in Resin Acid Composition During Catalytic Hydrogenation of Rosin
松香催化加氢过程中树脂酸组成变化的跟踪分析
属类：化学及生命科学-化学-论文文摘
The results showed that during hydrogenation of rosin under the experimental conditions the dominant reaction was the formation of dihydro resin acids with minor products of tetrahydro resin acids and dehydroabietic acid.
证实在本实验条件下松香催化加氢过程中的主体反应是树脂酸的二氢化,只伴随少量的四氢化和极少量的脱氢反应。
属类：化学及生命科学-化学-论文文摘
It was found that isomerization existed between dihydropimaric\isopimaric-type resin acids due to the shift of double bonds.
发现在二氢海松酸\异海松酸型树脂酸的分子间存在因双键移位而引起的异构现象。
属类：化学及生命科学-化学-论文文摘
Totally, seven dihydroabietic-type resin acids,five dihydropimaric\isopimaric-type resin acids and three tetrahydro resin acids were identified in the tracking analysis.
在整个跟踪分析过程中,共检出7种二氢枞酸型树脂酸、5种二氢海松酸\异海松酸型树脂酸及3种四氢树脂酸。
属类：化学及生命科学-化学-论文文摘
Determination of Organic Solvent Residues in Qinlongkusu by Headspace Gas Chromatography
顶空气相色谱法测定秦龙苦素中的残留溶剂
属类：化学及生命科学-化学-论文文摘
An analytical method of headspace gas chromatography was described for the determination of toxic volatile pernicious organic compounds such as benzene, toluene, p-xylene and n-hexane in Qinlongkusu.
采用顶空气相色谱法对秦龙苦素中残留的苯、甲苯、对二甲苯、正己烷等有害物质进行分析
属类：化学及生命科学-化学-论文文摘
The factors influencing the analysis, such as flow rate, column temperature, equilibrium time and extractiontime, were discussed.
并讨论了流速、柱温、平衡温度、平衡时间、抽样次数等因素对测定的影响。
属类：化学及生命科学-化学-论文文摘
The experimental results showed that the detection limits were 3-98 μg\L, relative standard deviations 0.59%-2.64%, and the recoveries 97.2%-120.0%.
分析结果表明,该方法对上述4种有害物质的检测限范围为3-98μg\L,测定结果的相对标准偏差为0.59%-2.64%,样品的回收率为97.2%-120.0%。
属类：化学及生命科学-化学-论文文摘
The method is effective, quick, sensitive and reproducible.
方法简便、快速、灵敏、重现性好。
属类：化学及生命科学-化学-论文文摘
headspace gas chromatography; Qinlongkusu; solvent residue
顶空气相色谱法;秦龙苦素;溶剂残留
属类：化学及生命科学-化学-论文文摘
Determination of Nine Haloacetic Acids and Six Anions in Drinking Water by Ion Chromatography with Large Volume Direct Injection
大体积直接进样离子色谱法测定饮用水中9种卤代乙酸和6种阴离子
属类：化学及生命科学-化学-论文文摘
With a high capacity anion exchange column, IonPac AS9HC column, and 28 mmol\L sodium carbonate as eluent, the nine HAAs could be well separated and determined within 35 min by employing a flow rate gradient.
采用高容量的IonPac AS9HC阴离子色谱柱,以28mmol\L Na2CO3为淋洗液,采用流速梯度洗脱,可在35min内同时测定上述9种被测物。
属类：化学及生命科学-化学-论文文摘
The detection limits for the nine HAAs were between 1.91 and 49.98 μg\L.
对9种卤代乙酸的检测限为1.91-49.98μg\L
属类：化学及生命科学-化学-论文文摘
The method was applied for the determination of the haloacetic acids in the source waters and treated drinking waters from nine waterworks of Beijing.
应用该方法对北京市9个自来水厂的源水及出厂水中的卤代乙酸进行了测定。
属类：化学及生命科学-化学-论文文摘
| 1 | 该年度的重点工作是:总量调控措施基本到位 | The primary goals finished in 1999 were as follows: the gross adjustment and controlling had been put in force |
|
| 2 | 市场环境明显改善 | the market condition had gotten better largely |
|
| 3 | 清理整顿小炼油厂工作取得阶段性进展 | the lesser refineries had been put into order gradually |
|
| 4 | 采用超声抽提法对化妆品中的苯甲醇、3-甲基-4-异丙基苯酚、对羟基苯甲酸丁酯和2-苄基-4-氯酚等18种防腐剂进行了气相色谱-质谱法(GC-MS)测定的研究。 | Ultrasonic extraction and gas chromatography-mass spectrometry(GC-MS)have been used to analyze 18 preservatives in cosmetics such as benzyl alcohol, 3-methyl-4-isopropylphenol, butylparaben, 2-benzyl-4-chlorophenol, etc. |
|
| 5 | 建立了一种简单、快速、准确测定化妆品中各种防腐剂的测定方法。 | A simple, rapid and accurate method for the determination of preservatives in cosmetics has been established. |
|
| 6 | 进行了样品提取溶剂和超声提取时间选择以及线性、回收率、精密度试验。 | Ultrasonic extraction durations and solvents were selected. Linearity, recovery, precision were determined. |
|
| 7 | 松香催化加氢过程中树脂酸组成变化的跟踪分析 | Tracking Analysis of Changes in Resin Acid Composition During Catalytic Hydrogenation of Rosin |
|
| 8 | 证实在本实验条件下松香催化加氢过程中的主体反应是树脂酸的二氢化,只伴随少量的四氢化和极少量的脱氢反应。 | The results showed that during hydrogenation of rosin under the experimental conditions the dominant reaction was the formation of dihydro resin acids with minor products of tetrahydro resin acids and dehydroabietic acid. |
|
| 9 | 发现在二氢海松酸\异海松酸型树脂酸的分子间存在因双键移位而引起的异构现象。 | It was found that isomerization existed between dihydropimaric\isopimaric-type resin acids due to the shift of double bonds. |
|
| 10 | 在整个跟踪分析过程中,共检出7种二氢枞酸型树脂酸、5种二氢海松酸\异海松酸型树脂酸及3种四氢树脂酸。 | Totally, seven dihydroabietic-type resin acids,five dihydropimaric\isopimaric-type resin acids and three tetrahydro resin acids were identified in the tracking analysis. |
|
| 11 | 顶空气相色谱法测定秦龙苦素中的残留溶剂 | Determination of Organic Solvent Residues in Qinlongkusu by Headspace Gas Chromatography |
|
| 12 | 采用顶空气相色谱法对秦龙苦素中残留的苯、甲苯、对二甲苯、正己烷等有害物质进行分析 | An analytical method of headspace gas chromatography was described for the determination of toxic volatile pernicious organic compounds such as benzene, toluene, p-xylene and n-hexane in Qinlongkusu. |
|
| 13 | 并讨论了流速、柱温、平衡温度、平衡时间、抽样次数等因素对测定的影响。 | The factors influencing the analysis, such as flow rate, column temperature, equilibrium time and extractiontime, were discussed. |
|
| 14 | 分析结果表明,该方法对上述4种有害物质的检测限范围为3-98μg\L,测定结果的相对标准偏差为0.59%-2.64%,样品的回收率为97.2%-120.0%。 | The experimental results showed that the detection limits were 3-98 μg\L, relative standard deviations 0.59%-2.64%, and the recoveries 97.2%-120.0%. |
|
| 15 | 方法简便、快速、灵敏、重现性好。 | The method is effective, quick, sensitive and reproducible. |
|
| 16 | 顶空气相色谱法;秦龙苦素;溶剂残留 | headspace gas chromatography; Qinlongkusu; solvent residue |
|
| 17 | 大体积直接进样离子色谱法测定饮用水中9种卤代乙酸和6种阴离子 | Determination of Nine Haloacetic Acids and Six Anions in Drinking Water by Ion Chromatography with Large Volume Direct Injection |
|
| 18 | 采用高容量的IonPac AS9HC阴离子色谱柱,以28mmol\L Na2CO3为淋洗液,采用流速梯度洗脱,可在35min内同时测定上述9种被测物。 | With a high capacity anion exchange column, IonPac AS9HC column, and 28 mmol\L sodium carbonate as eluent, the nine HAAs could be well separated and determined within 35 min by employing a flow rate gradient. |
|
| 19 | 对9种卤代乙酸的检测限为1.91-49.98μg\L | The detection limits for the nine HAAs were between 1.91 and 49.98 μg\L. |
|
| 20 | 应用该方法对北京市9个自来水厂的源水及出厂水中的卤代乙酸进行了测定。 | The method was applied for the determination of the haloacetic acids in the source waters and treated drinking waters from nine waterworks of Beijing. |
|
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