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- naphthol
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  相似匹配句对
     Synthesis of Naphthol AS-JH
     色酚AS-JH的合成
短句来源
     Study on purification of naphthol AS
     色酚AS的精制工艺研究
短句来源
     the consumption of β-naphthol;
     β-萘酚;
短句来源
     The Spectrophotometric Determination of 1—Naphthol
     1—萘酚的光度测定
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  - naphthol
The kinetics of Coprinus cinereus peroxidase-catalyzed 1-naphthol, 2-naphthol, and 4-hydroxybiphenyl oxidation was investigated.
      
At the peroxide concentration 100 μM calculated Km and the maximal rate (Vmax) were 74.7 μM and 0.53 μM/sec or 175 μM and 2.0 μM/sec for 1- or 2-naphthol, respectively, and 29.68 μM and 0.42 μM/sec for 4-hydroxybiphenyl.
      
The radiation-chemical discoloration of evacuated alcoholic solutions of the azo dye 1-(2-pyridylazo)-2-naphthol was studied using a pulse radiolysis technique.
      
An atomic absorption spectrometric method for the determination of trace amounts of nickel after adsorption of its 1 -(2-pyridylazo)-2-naphthol complex on microcrystalline naphthalene has been developed.
      
Alternatively, nickel can be quantitatively adsorbed on [l-(2-pyridylazo)-2-naphthol]-naphthalene adsorbent packed in a column and determined similarly.
      
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o-Nitrophenol,p-nitrophenol,4-nitro-2-methyl-phenol,2,6-dichloro-4-nitro-phenol,p-nitrosophenol,4-nitroso-2-methyl-phenol,α-nitroso-β-naphthol,p-hydroxy-azobenzenesulfonic acid and Orange Ⅱ were reduced satisfactorily to the corre-sponding aminophenolic compounds by glucose or invert sugar in alkaline solu-tion.m-Nitrophenol and 2,4-dinitrophenol gave negative results.Due to high yield and easy manipulation,this method may be used withadvantage in the laboratory preparation of aminophenolic compounds.

(一)葡萄糖或转化糖在碱性溶液中能把硝基酚类、亚硝基酚类及对磺酸苯偶氮酚类化合物还原成为相应的氨基酚类化合物。得到正面结果的有:阾硝基苯酚、对硝基苯酚、4-硝基2-甲基苯酚、2,6-二氯-4-硝基苯酚、对亚硝基苯酚、4-亚硝基-2-甲基苯酚、α-亚硝基-β-萘酚、对磺酸苯偶氮苯酚、橙Ⅱ等九种化合物。结果可称满意。(二)间硝基苯酚与2,4-二硝基苯酚在上述条件下,得不到相应的氨基酚类化合物。

In the previous paper, we reported the formation of bis(O,O-diethyldithiophosphate) disulfide as an intermmediate product in the course of chlorination of O,O-diethyldithiophos phoric acid. During the past decade, much effort has been directed towards the synthesis of mixed phosphoric esters and esters of phosphoric anhydrides, some of them being found as powerful insecticides. The disulfide with the general, known as "phos phatogen," has not been closely investigated, and apart from isolated cxamples, little...

In the previous paper, we reported the formation of bis(O,O-diethyldithiophosphate) disulfide as an intermmediate product in the course of chlorination of O,O-diethyldithiophos phoric acid. During the past decade, much effort has been directed towards the synthesis of mixed phosphoric esters and esters of phosphoric anhydrides, some of them being found as powerful insecticides. The disulfide with the general, known as "phos phatogen," has not been closely investigated, and apart from isolated cxamples, little about this class of compounds has been recorded in the li'erature. Considering their possible insecticidal and fungicidal activities, we prepared a series of the disulfides, aliphatic as well as aromaic, and examined some of their chemical properties.In connection with the investigation stated above, we needed various O,O-dialkyldithiophos phoric acids as intermmediates. The reaction bstween monohydroxy alcohols, polyhydroxy alcohols and different types of phenols with phosphorus pentasulfide were studied. Methyl, ethyl, i-propyl, n-butyl, i-butyl, i-amyl i-amyl and cyclohexyl alcohols reaced with phosphorus pentasulfide smoothly to give O,O-dialkyldithiophosphoric acids in 80-90% yield. The reaction product of polyhydroxy alcohols, namely, ethylene glycol, trimethylene glycol, or glycorol with phosphorus pentasulfide was not homogeneous; we failed to isolate from it the expected product. Although pbenol and β-naphthol reacted with phosphorus pentasulfide equally smoothly, no expected dithiophosphoric acids were obtained from chlorophenols and nitrophenols.Pure sodium salts of the O,O-dialkyldithiophosphoric acids were oxidized by calculated amount of bromine in cold aqueous solution to give the disulfides in 58-85% yield. Eight different disulfides, were propared, where R represents methyl, ethyl, i-propyl, n-butyl, i-butyl, n-amyl, i-amyl, cyclohexyl or phenyl radical. Among these substances only the last one decomposed spontaneously in anhyhrous state within a few days, while the other members were quite stable and unchanged after four months.The disulfides exhibited typical radical or polar cleavage reactions of the unit, since they dissolved in cold aqueous sodium sulfide to form sodium salts of the ditbiophosphoric acid with separation of free sulfur. In alcoholic silver nitrate, they separeted in the form of silver salts of the corresponding dithiophosphoric acids according to the following equation:With alcoholic mercuric chloride, the formation of a double salt instead of the cleavage of -S-S-bond was observed. A series of the double salts with the general formula were prepared, where R represents methyl, ethyl, i-propyi, n-butyl, i-butyl, i-amyl, cyclohexyl or phenyl radical.

本實驗研究了各類醇及酚与五硫化二磷的作用,各種一元醇,苯酚与β-萘酚与五硫化二磷生成相當的二硫代磷酸O,O-二烴基酯,但多元醇,氯代苯酚,硝基苯酚与五硫化二磷作用後,均未得預期的產物。本實驗合成了八種二硫代磷酸O,O-二烴基酯的汞鹽,九種雙(硫代磷酸O,O-二烴基酯)二硫物及八種二硫物的氯化汞複鹽。二硫物是一類比較活潑的化合物,其-S-S-鍵易被離子化藥劑所離解,同時呈一定的氧化性能。二硫物有失去一個硫原子的傾向,硫原子成為游離狀態析出或与金属成硫化物。

A method of indirect polarographic determination of Zirconium is proposed. The method consists of the foIlowing steps: (1)Zirconium is precipitated by m—nitrobenzoie acid; (2) The precipitate is filtered, washed thoroughly with hot water, and redissolved in hot solution of perchloric acid and tartaric acid; (3) With potassium hydrogen phthalate as the supporting electralyte, α—naphthol as the maximum suppressor, the mnitrobenzoic acid equivalent to Zirconium in the precipitate is determined polarographically....

A method of indirect polarographic determination of Zirconium is proposed. The method consists of the foIlowing steps: (1)Zirconium is precipitated by m—nitrobenzoie acid; (2) The precipitate is filtered, washed thoroughly with hot water, and redissolved in hot solution of perchloric acid and tartaric acid; (3) With potassium hydrogen phthalate as the supporting electralyte, α—naphthol as the maximum suppressor, the mnitrobenzoic acid equivalent to Zirconium in the precipitate is determined polarographically. The conditions for indirect polarographic determination of Zirconium are discussed, The method can be used for the determination of small amounts of Zirconium in the presence of large amounts of Uranium, Cerium and Thoriun with a relative error less then 4%. For the purpose of examing applicability of the proposed method, Zirconium in Zircon containing small amonnt of iron was determined and the result was consistent with that obtained by the classical Colorimetric method.

本文介绍了锆的间接极谱测定法。该方法是基于锆用间硝基苯甲酸来沉淀,过滤,洗滌后,再溶解沉淀于过氯酸和酒石酸的混合热溶液中,以隣苯二甲酸氢鉀为支持电解质,α—萘酚为极大抑止剂,极谱测定与沉淀中锆相当的间硝基苯甲酸的含量。讨论了适于间接极谱测定锆的条件。本方法可望适用于大量鈾、铈、和钍存在下微量锆的测定,其相对误差不大于4%。为了验证其适用性,已将本法用于含少量铁的锆英石中锆的测定,得到了与经典的比色法相符的结果。

 
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