浓度测定

More diphenylthiocarbazone should be used to estimate barbiturate concentrations above 1 mg /dl.

当测定浓度超过1毫克／100毫升的巴比妥类药物时，必须用更多的双硫腙。

In the experiment,EAG technology was used to study the olfactory response of three typical bark beetle species to each one of the semiochemicals at different concentration,and the walking responses of the three species to each one and the different combinations of the semiochemicals were observed by using Y-tube olfactometer.

本研究通过触角电位技术，研究了3种具有代表性的小蠹虫对不同信息化合物及其不同浓度的EAG反应，并结合"Y"型嗅觉仪测定了3种小蠹虫对不同信息化合物及其组合的趋向反应。

The recovery rate of added water samples was from 85% to 115%. The range of the lowest detection limit was 0.08-0.21 μg/L. The correlation coefficient was more than 0.999 4. The relative standard deviations (n=6) were generally lower than 8.0% for 2 μg/L standard solution of benzene series through 6 repetitions of determination.

结果表明，水样的加标回收率在85%～115%，最低检测限在0.08～0.21 μg/L，相关系数大于0.999 4，浓度2 μg/L的苯系物标准溶液经重复6次测定，其相对标准偏差基本小于8.0%。

Benzonitrile was selectively hydrogenated into benzylamine under mild conditions over activated amorphous nickel aluminium alloy catalyst which was prepared by rapidly quenching method.

由铜鼓快速淬冷法制备的非晶态NiAl合金催化剂经活化后用于催化苯甲腈加氢制苄胺的反应，考察了溶剂种类、苯甲腈初始浓度、催化剂用量、反应温度及反应压力等因素的影响，并测定了该催化加氢反应的表观活化能。

Beta ray absorption method.

周围空气悬浮物质浓度的测定。B射线吸收法

The interfacial tension and interfacial shear viscosity of polymer solution/asphaltene model oil were measured respectively by Wilhelmy method and biconical bob method.

用挂片法和双锥摆法测定了聚合物溶液/沥青质模拟油体系的界面张力和界面剪切粘度，并对聚合物浓度对其的影响进行了分析。

The contents of bile acid were measured in the supernatant and the sediment of different concentrations of calcium solution.

测定不同浓度钙消化液的上清液和沉淀物中胆汁酸的含量。

In this paper, the importance of denitrification in the biogeochemical cycle of nitrogen in estuaries is summarized, It introduces methods of denitrification determination, as well as their advantages and disadvantages.

本文综述了河口区域反硝化作用在N元素生物地球化学循环过程中的重要作用，概述了不同测定反硝化速率的方法，并提出了各种方法的优缺点。总结了反硝化作用的影响因素：O2浓度，NO3，有机质，温度，生物等。

Objective The measurement of the ethanol concentration in the biological sample was discussed.

目的 探讨生物样品中乙醇浓度的测定方法。

The recovery of low, medium and high concentration, relative standard deviations of precision and stability experiments are consistent with the requirements of biological sample analysis.

结果表明，低、中、高三个浓度的回收率，精密度和稳定性试验结果均符合生物样品的测定要求，为君-使对药体内动力学和组织分布研究奠定了方法学基础。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！