71.080.15 - Aromatic hydrocarbons
ICS 71.080.15 Details
Aromatic hydrocarbons
Aromatische Kohlenwasserstoffe
Hydrocarbures aromatiques
Aromatski ogljikovodiki
General Information
ISO 5275: 2003 specifies a procedure (Doctor test) for the detection of thiols (mercaptans), hydrogen sulfide and elemental sulfur in hydrocarbon solvents and distillate petroleum feedstocks and products.
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ISO 5275: 2003 specifies a procedure (Doctor test) for the detection of thiols (mercaptans), hydrogen sulfide and elemental sulfur in hydrocarbon solvents and distillate petroleum feedstocks and products.
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Relates to products boiling below 200 °C. Directly applicable to contents of 0.1 mg/kg to 30 mg/kg. Higher contents may be determined by a suitable dilution of the sample. Alkylsulphones, arylsulphonic acids and arylsulphonates give incomplete recovery of sulphur. Reduction of the sulphur compounds to nickel sulphide with Raney nickel. Stripping of the hydrogen sulphide in hydrochloric acid medium and absorption in an alkaline zinc acetate solution. Formation of methylene blue with N,N-dimethyl-p-phenylenediamine sulphate and iron(III) ammonium sulphate. Determination of the absorbance of the blue coloured solution at a wavelength of 667 nm.
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These products are similar to petroleum products; many sampling procedures used for petroleum products are equally applicable to the former. Specifies the obtaining of samples from fixed tanks, railcars, road vehicles, barges and drums and from liquids being pumped in pipelines. The samples are intended to be used determine quality, for testing whether contaminants are present and for the determination of the degree of homogeneity of a batch. General recommendation and specific recommendations for hazardous, flammable and toxic substances are given and also the treatment of mobile liquids at low ambient temperatures is indicated.
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Applicable to products which consist essentially of xylene isomers ÄC6H4 -(CH3 )2 Ü and ethylbenzene (C6H5 -C2 H5). Specifies the requirements and test methods. The required characteristics are shown in a table.
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Specifies requirements for two grades. Grade 1 (synthesis grade) is a high quality grade normally required only for the use as a chemical feedstock. Grade 2 (ordinary grade) is suitable for most normal commercial uses. The requirements are given in a table.
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This document specifies a method to determine the total content of the 8 regulated polycyclic aromatic hydrocarbons (PAHs), see Table 1, in plastic and rubber articles by using GC-MS allowing detection at 0,1 mg PAHs/kg for plastic and 0,2 mg PAHs/kg for rubber material.
Table 1 - List of PAHs
...
NOTE Other PAHs compounds can also be analysed with this method, provided suitability has been proven.
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This document specifies a method to determine the total content of the 8 regulated polycyclic aromatic hydrocarbons (PAHs), see Table 1, in plastic and rubber articles by using GC-MS allowing detection at 0,1 mg PAHs/kg for plastic and 0,2 mg PAHs/kg for rubber material.
Table 1 - List of PAHs
...
NOTE Other PAHs compounds can also be analysed with this method, provided suitability has been proven.
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This European Standard defines the principal terms concerning crude tar and crude benzole.
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Applicable to products having boiling points lower than or equal to 150 0C. The lower limit of detection is 1 mg/100 ml. Based on evaporation of a test portion in a weighed dish, and determination of the increase in mass of the dish, which represents the residue.
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The document gives equivalent terms and defines some of the relevant terms used in the chemical technology of this product. - Cancels and replaces ISO Recommendations R 1542-1971 and R 1543-1971 and constitutes their technical revision.
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Applicable to the quantitative determination of contents of benzene, C8 aromatics and aliphatics up to n-nonane in the range between 0.01 % (m/m) and 1.00 % (m/m). Alternatives that will give equivalent results may also be used. Addition of a known amount of intgernal standard to a test portion and introduction of an aliquot portion of this mixture into a separating column. Sweeping of the vaporized mixture through the column by a flow of carrier gas. Detection of each component as it emerges by a flame ionization detector and recording as a peak on a diagram. Identification by their relative retention times and quantitative determination from the ratio of their peak areas.
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Specifies a method for the measurement of the temperature of the crystallizing point to the nearest 0.01 °C. Relates to a test portion saturated with water. Application of a correction to determine this point for the anhydrous material. Defines the requirements which must be fulfilled by the thermometer and describes the procedure for checking the thermometer. The arrangement of a crystallizing point measurement apparatus is shown in a figure.
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Specifies pyknometer and hydrometer methods. The principle of the pyknometer method bases on weighing an empty pyknometer, then filled with water and, finally, filled with the product under test at known temperatures. Calculation of the density from the values obtained applying certain corrections given in tables. The hydrometer method bases on the immersion of a hydrometer in the product under test and recording the hydrometer scale reading and the temperature. Calculation of the density from the values obtained after applying a correction to be obtained from the calibration certificate.
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Specifies the detection of thioalcohols. Hydrogen sulphide can also be detected by the test. Inapplicable in the presence of only traces of peroxides. Shaking of a test portion with sodium plumbite solution (Doctor solution) and observation of the mixture. From its appearence, the presence of thioalcohols, hydrogen sulphide, peroxides or elemental sulphur can be deduced. Confirmation by the addition of sulphur, shaking and observation of the appearance of the final mixture.
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Mixing a test portion to which a mixed indicator (bromocresol green/alizarin red S) has been added with water by shaking. Comparison of the colour of the aqueous layer with that of a neutral solution of the indicator.
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Specifies an acid washing test. Gives some indication of the degree of refining but does not give a precise measure of the amount of unsaturated compounds present as different unsaturated compounds produce different colourations with sulphuric acid. Shaking together of equal volumes of the sample and 95 % (m/m) sulphuric acid. Comparison of the colour of the acid layer with that of standard matching solutions.
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Applicable to material which consists essentially of C6H6. The requirements are given in a table.
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