碱测定法

Alkalimetry is standard method of determining degree of deacetylation of chitosan generally applied in aquaculture and other industry.

碱量法是水产行业测定壳聚糖脱乙酰度的标准方法，应用广泛。

In this paper, we have studied different types of indicators which can be used in alkalimetry, the results suggested that helianthine-triphenylrosaniline (1:1) mixed indicator can instruct color changes of titration end significantly, the accuracy and reproducible are good.

研究了用于碱量法测定的不同种类指示剂，结果表明：甲基橙－亚甲基蓝(1：1)混合指示剂终点颜色变化明显，准确性和重现性好，可以作为测定壳聚糖不同脱乙酰度的通用指示剂，解决了目前碱量法存在的通用性和毒害问题。

Celestite samples were decomposed by both acid digestion and alkali fusion techniques.

利用酸溶法和碱熔法分解天青石样品，经过离子交换分离得到纯净的Sr，测定~(87)Sr/~(86)Sr同位素比值，实验结果表明两种样品分解方法得到的~(87)Sr/~(86)Sr同位素比值的偏差〈0。

The in vitro releasing property of the preparation was examined by the method of in vitro delivery. The in vivo releasing property of the preparation was evaluated by the shadowgraph technique of barium sulfate. Results The preparation method of the PYTCSD was obtained.

以苦参碱和氧化苦参碱体外释放度为指标，对制剂的包衣处方进行筛选；采用体外释放度测定法考察该制剂的体外释放性能；采用硫酸钡造影技术对该制剂在人体内的释放性能进行评价。

By synthetically analysizing the physical and chemical properties of all components and particle size, the content of F2641 in the JOB-iC is determined by gravimetric analysis after F2641 is seperated from HMX,TATB and PNP through ? alkali reflux. Determination conditions is set as follows the sample is boilingly refluxed for six hour in a constant temperature bath after adding lOOm! 8.0 ?? 0.1% NaOH. The solvent DMF saturated by TATB is used for extracting HMX,F21 and PNP from the sample and TATB is seperated by crucible filter G4. The mass precent of TATB is determined by extraction fractionation. The mass percent of PNP is measured by multiwavlength linear regression ultraviolet spectrophotometry. The testing conditions are set as follows:multiwavlength constitution: X=267nxn, 275nm, 283nm, 29mm, 299nm,the application scope of the Lambert-Beer law: the concentration of PNP is O.005?0.O25mgIml, the concentration of HMX is 0.060.3Omg/ml,absorption coefficents of PNP and HMX are solved by the slope of linear regression curve of absorbency- concentration of standard solution of PNP and HMIX for measuring wavelengthes,on the basis of the Lanibert-Beer law and absorbancy additivity principle, the slope of linear regression curve of A/E(1) and E1 of PNP and HMX solution is regarded as the concentration of PNP in the solution.

根据传爆药中各组分的物理、化学性质及主体炸药的粒度大小，进行综合分析，确定了采用碱回流重量法测定JOB-1C 中F_(2641)的含量，测定条件：加入100ml浓度为8.0±0.1％的氢氧化钠，在恒温水浴中煮沸回流6h；采用溶剂萃取法测定JOB-1C中TATB的含量，选择TATB饱和的二甲基甲酰胺为萃取溶剂，用G4坩埚式过虑器进行萃取分离；采用多波长线性回归紫外分光光度法测定JOB-1C中PNP的含量，通过实验确定了多波长组合：λ=267nm，275nm，283nm，291nm，299nm；朗波—比耳定律的适用范围为PNP浓度：0.005～0.025mg/ml，HMX浓度：0.06～0.30mg/ml；在测定波长下，对PNP、HMX标准溶液的吸光度—浓度进行线性回归，由回归曲线的斜率得出PNP、HMX的吸收系数；根据朗波—比耳定律和吸光度加和性原理，在测定波长下，对PNP、HMX 两组分混合溶液A_i/E_HMX(i与E_PNP(i/E_HMX(i进行线性回归，回归曲线的斜率即为混合溶液中PNP的浓度。

Methods The rat stress gastric ulcer models induced by ethol and burned acetic acid were established and the effect of arecoline hydrobromide on the secretion of gastric acid and pepsase in rats was observed.

方法用化学测定法观察氢溴酸槟榔碱对大鼠胃液胃酸、胃蛋白酶分泌的影响；采用小鼠应激性胃溃疡模型、大鼠乙醇型胃溃疡模型和乙酸灼烧型大鼠胃溃疡模型来观察氢溴酸槟榔碱对胃溃疡动物模型的作用。

Soil organic matter, total nitrogen, available nitrogen and pH are measured with high temperature potassium dichromate oxidation-capacity, semiminim karl method, alkaline hydrolysis pervasion method, and the potentionmeter method respectively.

用五点混合取样法采集广西桂林毛村岩溶区和非岩溶区典型林地、灌草丛地和耕地的0~20cm，20~40cm土壤样品，以高温外热重铬酸钾氧化－容量法测定有机质含量，半微量凯氏法测定全氮含量，碱解扩散法测定有效氮含量，电位法测定pH值。

ABSTRACT Determination of stachydrine hydrochloride in Yimucao gao by TLCS. Sample in condition of acid through strong acidic positiveins exchanged resins, thus dissolved impurities like sugar etc.

薄层扫描法测定益母草膏中盐酸水苏碱的含量提要用薄层扫描法测定了益母草膏中盐酸水苏碱的含量。

The CO2 effluxes from the soil showed exponential responses to the air temperature with significant correlative coefficient (from 0.84~0.87 under different straw management, irrigation and nitrogen application strategies).

为探讨不同农作措施条件下的农田碳平衡规律，研究农田对大气CO_2的源汇特征，2000年至2003年用钠石灰碱吸收法连续测定不同秸秆还田、灌溉和氮肥施用等农作措施下京郊冬小麦—夏玉米轮作体系作物生长季的土壤呼吸。

The nucleosides and their bases in Cordyceps sinensis. of different origin and in its adulterations and counterfeits were studied by HPLC. The components and contents of nucleosides and their bases in Cordyceps sinensis.,and in the adulterants and the counterfeits were compared to find the difference among them.

采用HPLC法对不同产地的冬虫夏草中核苷及其核苷碱基进行测定研究，并用该方法测定混淆品及伪品中核苷及核苷碱基的含量，比较正品、混淆品及伪品中核苷及核苷碱基的种类和含量，找出它们之间的差异规律。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。