浓度测定

The water activities and osmotic coefficients have been determined at 25 ℃, over the range of concentrations from diluted up to saturated with respect to the solute of NaCl for the synthetic salt lake brine Li Na K Mg Cl SO 4 H 2O systems by isopiestic method using an improved apparatus.

根据我国青海一里坪和东台吉乃尔盐湖晶间卤水Li Na K Mg Cl SO4 H2 O体系的组成制备了两种合成卤水储备溶液，采用等压法和改进的实验装置在 2 5℃下，从稀释到溶液中溶质NaCl达到饱和的浓度范围，对合成卤水溶液进行了等压测定，确定了它们的水活度aH2 O，和渗透系数φ；比较了两种卤水的热力学性质及其变化的规律，揭示了其天然卤水浓度差异的物理化学成因。

Results: The linear range of dichlorovos, methyl parathion and malathion was 0.25~3.00 μg/ml.

结果：敌敌畏、甲基对硫磷和马拉硫磷的测定浓度在0.25~3.00 μg/ml时，浓度与峰面积呈线性关系。

Results: The good linear range of method was 10 to 1000μg/ml (T=0.9999) with the correlation coeffivient of 0.9999, and the limit concentration in air was 0.2 mg/m^3 with the average relative standard deviation less than 5%(n=6). The average sampling rate ranged from 96.6 to 100%, and the breakthrough capacity of l00mg activated charcoal was 4.7mg. The average desorption rate was 97.6%, and mesityl oxide absorped in activated charcoal tube was stable for 7 days and can be detected accurately with other gas coexisting in the air of workplace.

结果：异亚丙基丙酮浓度在10~1000μg/ml内呈良好线性关系，相关系数0.9999，最低检出浓度为0.2mg/立方公尺，相对标准偏差＜5%(n=6)；气体采样效率≥96.6%，100mg活性炭对异亚丙基丙酮的穿透容量为4.7mg，平均解吸效率97.6%；活性炭样品室温下可保存7天；丙酮、丁酮、异佛尔酮、苯、甲苯、二甲苯等共存物不干扰测定。

Concentration of plasma Hp is determinated by micromethod chromogenic substrate and is oberserved in 18 hemodialysis patients suffering from in nephrosis and 2 DIC patients treated in Hp.

用微量发色底物法测定血浆Hp浓度，监测了18例肾病病人血透期间和2例DIC病人在用肝素治疗期间血浆肝素浓度。

The concentrations of naphthalene in CO2-rich phase for the ternary system CO2 +［bmim］［PF6］+ naphthalene were determined by a static method with online high-pressure ultraviolet detection, under the conditions of naphthalene molality in the liquid phase ranging from 0.0169 to 0.378 mol·kg-1, and temperature 313—333 K,pressure 8—20 MPa.

采用紫外光谱在线检测的静态相平衡方法，在温度313～333 K、压力8～20 MPa、萘的液相浓度0.0169～0.378 mol·kg-1的范围内，测定了CO2+［bmim］［PF6］+萘三元系中萘在富含CO2相的浓度。

A linear relationship between peak current and concentration was obtained in the range from 1×10^(-7)~2×10^(-5) mol/L, and the detection limit (signal to noise=3) is 8×10^(-9)moL/L after 4 min open-circuit accumulation.

在1×10^(-7)~2×10^(-5)mol/L浓度范围内，峰电流与浓度呈良好的线性关系，开路富集4 min后，检出限（3倍信噪比）为8×10^(-9)mol/L.2×10^10(-5)mol/L×2-硝基苯酚平行测定8次的相对标准偏差为3.8%。

At that temperature. Varying concentrations of sulfate acid were tested as humidity control agents at 5-35℃, with each yielding a stable humidity in the perspex chamber regardless of temperature.

同时对不同浓度硫酸溶液控制生长箱内不同水平的湿度进行了测定和检验，亦效果良好，且对环境温度的适应性强，在5-35℃范围内同一硫酸浓度控制相同的稳定湿度。

No interference was found with conventional drugs, except vancomycin and methylprednisolone. The average concentrations of phenacetin and paracetarnol were (5.94 ± 4.79) and (8.81 ± 2.91)μg/mL in serum,(3.25 ± 1.10) and (570.45 ± 187.13)μg/mL in urine in the 13 healthy volunteers.

除万古霉素和甲泼尼龙外，其他临床常用药物对测定无干扰。13名健康受试者血清中非那西丁和总对乙酰氨基酚浓度为(5.94±4.79)和(8.81±2.91)μg/mL；尿液中非那西丁和总对乙酰氨基酚浓度为(3.25±1.10)和(570.45±187.13)μg/mL。

To keep isotemperature of the system,the polarimeter tube was installed constant temperature system and isotemperature result was satisfying.

为了达到理想的恒温效果，本文对旋光仪组装了恒温系统；首次通过测定不同盐酸浓度条件下蔗糖水解速率常数拟合出盐酸浓度对蔗糖水解速率常数的新的等温式。

Their electrochemical behaviors for single solute and mixed systems of hydroquinone(H2Q) and pyrocatechol are investigated.A pair of redox peak of H2Q and two pairs of redox peaks of PC on the composite film electrodes can be obviously distinguished in their mixed systems,which show the composite film electrodes have excellent electrocatalytic activity for two ...

结果表明聚苯胺复合膜电极具有很好的电催化作用，在混合体系中对苯二酚的一对氧化还原峰和邻苯二酚的两对氧化还原峰能够清楚地区分；并且在一定的浓度范围内单组分的浓度与峰电流呈良好的线性关系，说明该电极对苯二酚的测定在定性、定量中具有潜在的应用价值。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。