浓度测定

Results: In the comparison between phenol red colormetric method and the other methods, the corrlative coefficency was 0.9822 and 0.9813, and the bias was 1.64% and 1.59% at 15～45 mmol/L.

结果 酚红比色法与离子选择性电极法、酶法比较，相关系数分别为0.9822和0.9813，碳酸氢根测定浓度在15～45 mmol/L时的预期相对偏差均值分别为1.64%和1.59%。

The adsorption properties of the function fiber in solution for transition metal ion such as Zn2+,Cd2+,Hg2+etc., were studied and the effects of temperature, concentration, pHon adsorption were also determined. The results showed that the fiber exhibited fairly good adsorption properties, and the adsorption capacities for Zn2+.Cd2+,Hg2+ were up to 196.79mg/g, 275.40mg/g and 6,84.01mg/g respectively.

又研究了该纤维材料在水溶液中对Zn2+、Cd2+、Hg2+等过渡金属离子的吸附性能，测定了温度、起始浓度、PH对吸附性能的影响，结果表明该功能纤维对部分过渡金属二价离子有良好的吸附，对zn2+、Cd2+、Hg2+的吸附量分别为196.79mmg／g、275.40rmmg／g、684.01mmg／g。

Methods:Twenty four hours urine was taken from urinary calculus patients and acidified by concentrated hydrochloric acid and diluted, concentrations of calcium and phosphonium were measured by biochemical analyzer.

目的：建立一种同时测定尿中钙、磷、尿酸浓度的方法-血生化分析法，并评价此方法在临床研究中的价值。

The trial was determined the concentration of ammonia sulfureted hydrogen of piggery \poultry house in Shanghai district.

本试验测定了上海地区猪舍、鸡舍冬季氨气、硫化氢的浓度，分别为：4。

The paper mainly studied the effects of different concentration of Cd single and Cd+Se 0.05 mmolL^(-1 combined pollution on dynamics of chlorophyll, proline, malondialdehyde and SOD, POD, CAT in corn seedling using the solution culture method.

采用溶液培养法，在不同浓度Cd单一及Cd+Se复合污染下，对玉米体内叶绿素、脯氨酸、丙二醛，以及对超氧化物歧化酶、过氧化物酶、过氧化氢酶活性的动态变化进行测定。

Methods Iodine in sea water was determined by F-78 pulse polarograph under conditions of 0.5 mol/L KCl, 2.4×10-4 mol/L EDTA, pH=9.5 and removing O2 by inflation of pure N2 for 20 minutes. Results Recovery rate of sample was 97.7%～105%.

方法采用F-78型脉冲极谱仪于底液KCl浓度为0.5 mol/L ，EDTA为2.4×10-4mol/L，pH为9.5，通纯氮气除氧20 min条件下测定海水的含碘量。

The optimum conditions for extraction was proved practicable by condition filtration and orthogonal design with supersonic wave method .The results showed that the optimum conditions for extraction to ultrasonic method is : methanol (φ=40,20ml),and 15℃ for 30 min ,this paper has determined nicotine contents that is 23.50mg/g at absorption peak (λ=262nm) by HPLC with an eluent consisting of methanol –potass Phosphate alleciate (pH=3) with the recovery and coefficient of variation are 101.52% and 0.91%.

通过超声波提取方法进行条件筛选和正交化实验，确定了烟草中尼古丁的最佳提取条件，结果表明，超声波最佳条件是：甲醇浓度40%，固液比1：20，提取时间30 分钟，超声温度15℃，用高效液相色谱方法在波长262nm 处测定尼古丁的含量，流动相组成为甲醇：磷酸二氢钾缓冲溶液=10：90，测得烟草中尼古丁的含量为23.50 mg/g，平均回收率为101.52%，相对偏差为0.91%。

Pd could be quantificationally separated from Sb, Zrand Ce by flotation when the concentrations of potassium bromide and tetrabutyl ammonium bromide in solution were 1.5×10^(-2) molL^(-1) and 2.0×10^(-3) molL^(-1), respectively. The method was used for the separation and determination of Pdin the sample of synthetic water with satisfactory results.

当溶液中嗅化钾和四丁基溴化铵的浓度分别为1.5×10^(-2)molL^(-1)和2.0×10^(-3)molL^(-1)时，钯被定量浮选，实现了钯与锑、锆、和铈离子的定量分离，对合成水样中的钯进行定量浮选分离测定，结果满意。

The potassium dichromate at different concentrations could increase the cell mitosis index.

以不同浓度的重铬酸钾为诱变剂，测定玉米根尖细胞的微核率、有丝分裂指数和染色体畸变率。

More than 50 chemical substances were prelim inarily tested their efficiency to enhance the toxicity of Bacillus thuringiensis against Heliothis armgera.Experiments of bolting synergists and killing insects were conducted in laboratory.

本试验测定了50种化合物包括各种盐类、有机酸、氨基酸和阿维菌素(25ug/ml)等，在添加浓度为0.1％、0.5％和1.0％的剂量下对苏云金杆菌标准品的增效作用。

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！