滴定标准液

Methods:Use the acidbase neutralization method,make the NaOH solution titrate surplus hydrochloric acid standard solution after calcium carbonate in cuttlebone,gain the acid strength of Wubeichangweiping capsule by calculated.

采用酸碱中和法，用氢氧化钠滴定液滴定中和乌贝肠胃平胶囊海螵蛸中碳酸钙过剩的盐酸标准溶液，计算得乌贝胃肠平胶囊的制酸力。

By researching the original analysis method for CaF2 in fluorspar,this paper discovered its shortcomings,determined three main factors for causing CaF2 analysis results to be lower slightly:determination of total Ca contents,determination of CaCO3 as well as calibrating of EDTA standard titration solution.

通过对萤石中 CaF2的原分析方法的研究，找出其中的不足，确定了导致 CaF2分析结果偏低的三个主要因素：Ca的总量的测定、CaCO3的测定以及EDTA标准滴定液的标定，结合国家标准分析方法，对我们正在使用的分析方法进行改进，以解决这些问题。

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All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on th...

本法用硝酸铁为标准液，水杨酸钠作指示剂，在 pH=3左右作滴定；当溶液呈橙黄色时，加入适量的乙醇，使其浓度在终点时仍不低于50%。

All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the r...

本法用硝酸铁为标准液，水杨酸钠作指示剂，在 pH=3左右作滴定；当溶液呈橙黄色时，加入适量的乙醇，使其浓度在终点时仍不低于50%。

All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reac...

本法用硝酸铁为标准液，水杨酸钠作指示剂，在 pH=3左右作滴定；当溶液呈橙黄色时，加入适量的乙醇，使其浓度在终点时仍不低于50%。

This kind of material is had volatile, after the evaporate in alkalescent solution goes out, with titrate of standard acerbity solution, computation its content. Triumphant family name decides 1.2 main instruments and reagent azotic appearance: KJeltecTM2300,; of Swiss FOSS company magnesian, boric acid, hydrochloric acid: The? that treat Ju is magnesian mix hang fluid: 1%.

此类物质具有挥发性，在碱性溶液中蒸出后，用标准酸溶液滴定，计算其含量。1.2主要仪器和试剂凯氏定氮仪：kjeltecTM2300型，瑞士FOSS公司；氧化镁、硼酸、盐酸：分析纯；氧化镁混悬液：1%。

Therefore can pass to use the cupric sulfate sulfuric acid potassium for the catalyst take sulfuric acid as to carry the body to digest it, make the amino acids chelate match the conversion for dissolve sex easily of ammonium sulfate and white vitriol, then absorb a fixed amount to try the kind to join 40% sodium hydroside combine under the steam heat function make ammonia the spirit swims to leave out, through cool off to respond the born boric acid with boric acid, be got the total nitrogen content by the standard aqua titration of hydrochloric acid immediately after;But the white vitriol can immediately join the hydrochloric acid hydroxylate , fluoride to turn the in order to cover up, carry on the titration but get the content of its zinc with the EDTA mark liquid..

因此可以通过用硫酸铜硫酸钾为催化剂以硫酸为载体将其消化，使氨基酸螯合锌转化为易溶性的硫酸铵和硫酸锌，然后吸取一定量的试样加入40 %的氢氧化钠并在水蒸气高温作用下使氨气游离出来，经冷却与硼酸反应生成硼酸铵，接着由盐酸标准溶液滴定得到总氮含量；而硫酸锌即可加入盐酸羟铵、氟化氢铵为掩蔽剂，用EDTA标液进行滴定而得到其锌的含量。

K + can be quantitatively precipitated with sodium tetraphenylboron in HAC\|NaAC buffer solution (pH5~6) and the amount of excess Na\|TPB can be determined by oscillographic titration with a standard solution of tetraethylammonium chlorid monohydrat.

报道了用示波滴定法测定黄原酸钾含量，在 p H5～ 6的 HAc- Na Ac缓冲底液中，加入四苯硼钠沉淀 K+，过量的 Na- TPB用氯化四乙基铵标准溶液滴定，滴至 Na- TPB示波图切口消失为终点，终点直观敏锐，方法快速简便，准确度、精密度均高。

A new method of oscillographic titration for the determination of nitrogen content in flour is described The sample was digested with H 2SO 4 Na 2SO 4 CuSO 4 Oscillographic titration is conducted on NH + 4 with Na TPB method,then calculate the nitrogen content Compared with standard methods,this method choose innoxious titrant,has a sharp titration endpoint, needs no distillation absorption and indicator It has the advantages of being easy and quick in operation,and the determination re...

研究了面粉中蛋白质含量的示波滴定法。样品用H2 SO4 Na2 SO4 CuSO4 消化处理，N以NH4 +的形式存在于试液中，用过量四苯硼钠沉淀铵，沉淀过滤，过量的四苯硼钠用氯化四乙基铵标准溶液返滴定，以四苯硼钠切口消失为终点，计算出氮含量，再换算为蛋白质含量。与通用的标准分析方法相比较，本方法所用试剂无毒，终点变化敏锐，不需蒸馏吸收，不外加指示剂，具有操作简便、快速，测定结果准确可靠。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。