0520;5603 标准查询与下载

ISO 5278:1980 苯.结晶点的测定

Benzene; Determination of crystallizing point

ISO 5793:1978 工业用硫磺 氯化物含量的测定 光度法

Sulphur for industrial use; Determination of chloride content; Photometric method

ISO 3695:1977 工业用硝酸铵 氯离子含量的测定 电位滴定法

Applicable to products having chloride contents equal or more than 0.0002 % (m/m). Potentiometric titration of the ions with silver nitrate solution in a nitric acid-acetone-water medium using a silver measurement electrode and a colomel reference electrode.

Ammonium nitrate for industrial use; Determination of chloride ions content; Potentiometric method

ISO 3694:1977 工业用硫酸铵 氯离子含量的测定 电位滴定法

Applicable to products having chloride ion contents of equal to or more than 0.0005 % (m/m). Potentiometric titration of the ions with silver nitrate solution in a nitric acid-acetone-water medium, using a silver measurement electrode and a calomel referende electrode.

Ammonium sulphate for industrial use; Determination of chloride ions content; Potentiometric method

ISO 3693:1977 工业用硝酸 氯离子含量的测定 电位滴定法

Applicable to products having chloride contents equal or more than 0, 0002 % (m/m). Potentiometric titration of the ions with silver nitrate solution in a nitric acid acetone-water medium using a silver measurement electrode and a calomel reference electrode.

Nitric acid for industrial use; Determination of chloride ions content; Potentiometric method

ISO 5143:1977 工业用碳酸钠.硫化物含量的测定.还原和滴定法

Sodium carbonate for industrial use; Determination of sulphur compounds content; Method by reduction and titrimetry

ISO 4277:1977 天然和人造冰晶石 计算游离氟化物含量的常规试验法

Cryolite, natural and artificial; Conventional test for evaluation of free fluorides content

ISO 3333:1975 工业用硫酸铵 铜含量的测定 二苄基二硫代氨基甲酸锌光度法

Applicable to products of which the Cu content is more than 0, 1 mg/kg. The detection bases on the formation of a coloured complex of copper and of zinc dibenzyldithiocarbamate and photometric measurement at a wavelength of about 435 nm.

Ammonium sulphate for industrial use; Determination of copper content; Zinc dibenzyldithiocarbamate photometric method

ISO 3329:1975 工业用硝酸铵 硫化合物含量的测定 还原滴定法

Applicable to products the content of which, expressed as sulphate, is equal to or more than 0.0005 % (m/m). Heating of a test portion in the presence of sodium carbonate, in a fume-cupboard, until the ammonium salts have been eliminated (about 300 ?C). Reduction of the sulphureous residue to sulphides by a mixture of hydriodic acid and hypophosphorus acid. Absorption of the hydrogen sulphide evolved in a mixture of sodium hydroxide solution and acetone. Titration of the sulphide with standard volumetric mercury(II) acetate solution in the presence of dithizone as indicator. A typical apparatus for reduction and distillation is shown in a figure.

Ammonium nitrate for industrial use; Determination of content of sulphur compounds; Method by reduction and titrimetry

ISO 3000:1974 工业用三聚磷酸钠 三聚磷酸盐含量的测定 氯化三乙二胺钴(III)重量法

Not applicable in the presence of metaphosphate. The presence of pyrophosphate at normal concentrations ?maximum 6 % (m/m)? does not interfere. The principle consists in precipitation of tripolyphosphate as its complex with tris(ethylenediamine) cobalt(III) chloride at a pH of between 3 and 4 in a buffered medium. Filtration, washing, drying and weighing of the precipitate. Details the preparation of the reagent used for analysis. Has also been approved by the IUPAC.

Sodium tripolyphosphate for industrial use; Estimation of tripolyphophate content; Tris(ethylenediamine) cobalt (III) chloride gravimetric method

ISO 2999:1974 工业用焦磷酸钠 焦磷酸盐含量的测定 电位滴定法

Applicable to products containing at least 90 % (m/m) of tetrasodium pyrophosphate and in the absence of more condensed forms of phosphates. The reaction based on conversion of tetrasodium pyrophosphate to disodium dihydrogenpyrophosphate by addition of hydrochloric acid. Introduction of zinc sulfate in solution for precipitation of zinc pyrophosphate and formation of sulphuric acid. Potentiometric titration of the sulphuric acid formed with standard volumetric sodium hydroxide solution. Has also been approved by the IUPAC.

Sodium pyrophosphate for industrial use; Estimation of pyrophosphate content; Potentiometric method

ISO 2866:1974 工业用硫磺 碳总含量的测定 滴定法

Gives the potentiometric and visual methods als alternatives for the final titration. The principle consists in the combustion of the sulphur in a current of oxygen. Oxidation and fixation of the sulphur dioxide and trioxide gases in chromic and sulphuric acid solutions. Absorption of the carbon dioxide formed in a solution of barium hydroxide, followed by titration in the presence of phenolphthalein and screened methylorange (by xylene cyanol FF) as indicator. Has also been approved by the IUPAC.

Sulphur for industrial use; Determination of total carbon content; Titrimetric method

ISO 2899:1974 工业用硫酸和发烟硫酸 氨态氮含量的测定 分光光度法

Applicable to products having contents of more than 0.0001 % (m/m). The procedure described is suitable for contents between 0.0001 % (m/m) and 0.0005 % (m/m). It bases on distillation, with entrainment by steam, of the ammonia in the presence of an excess of sodium hydroxide and collection of the distillate in an excess of acid solution. Neutralization of the dexcess of acid and formation of the coloured complex by treatment with sodium phenate and sodium hypochlorite in the presence of acetone. Spectrophotometric measurement of the indophenol obtained at a wavelength of about 630 nm. Has also been approved by the IUPAC.

Sulphuric acid and oleums for industrial use; Determination of ammoniacal nitrogen content; Spectrophotometric method

ISO 2717:1973 工业用硫酸和发烟硫酸 铅含量的测定 双硫腙光度法

Applicable to the determination of contents exceeding 1 mg/kg. The principle bases on evaporation of the test portion, dissolution in hydrochloric acid and reduction by hydroxylammonium chloride. Formation of complexes of interferring elements with ammonium citrate and potassium cyanide. Extraction of the lead at a pH of between 8.5 and 10 by a solution of dithizone in chloroform. Elimination of excess dithizone by an ammoniacal solution of potassium cyanide. Photometric measurement in chloroform solution at a wavelength of about 520 nm. Has also been approved by the IUPAC.

Sulphuric acid and oleum for industrial use; Determination of lead content; Dithizone photometric method

ISO 2364:1972 工业用硝酸铵 游离酸度的测定 容量法

The principle of the analysis consists in titration of a test portion with a standard sodium hydroxide solution in the presence of methyl red/methylene blue mixed indicator.

Ammonium nitrate for industrial use; Determination of free acidity; Volumetric method

ISO 2363:1972 工业用硫酸和发烟硫酸 氮氧化物的测定 2,4-二甲苯酚分光光度法

The method ia applicable of oxide of nitrogen contents equal to or greater than 0, 00002 % (m/m). The principle is based on oxidation of nitrous nitrogen to nitric nitrogen by potassium permanganate. Reaction of nitric nitrogen with 2, 4-xylenol under specified conditions to form a nitrate derivate. Distillation of the nitrate derivate and absorption in sodium hydroxide solution. Spectrophotometric measurement of the yellow coloured nitrophenol at a wavelength of about 445 nm.

Sulphuric acid and oleums for industrial use; Determination of oxides of nitrogen; 2,4- Xylenol spectrophotometric method