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GB/T 21892-2015: P-aminophenol Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 21892: Historical versions
Similar standardsGB/T 21892-2015: P-aminophenol---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT21892-2015GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.100.01;87.060.10 G 56 Replacing GB/T 21892-2008 p-Aminophenol 对氨基苯酚 Issued on: MAY 15, 2015 Implemented on: DECEMBER 01, 2015 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Requirements... 6 4 Safety information... 7 5 Sampling... 7 6 Test methods... 8 7 Inspection rules... 14 8 Marks, labels, packaging, transportation and storage... 15 p-Aminophenol WARNING -- Personnel using this Standard should have practical experience in laboratory work. This Standard does not address all safety issues. Users are responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated in relevant national laws and regulations.1 ScopeThis Standard specifies the requirements, sampling, test methods, inspection rules, as well as marks, labels, packaging, transportation and storage of p-aminophenol. This Standard applies to the quality control of p-aminophenol products. Structural formula. Molecular formula. C₆H₇NO Relative molecular mass. 109.13 (according to the 2009 International Atomic Mass Standard) CAS RN. 123-30-82 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 190, Labels for packages of dangerous goods GB/T 191, Packaging and storage marks GB/T 601, Chemical reagent -- Preparations of reference titration solutions GB/T 603, Chemical reagent -- Preparations of reagent solutions for use in test methods GB/T 2384, Dyes intermediates -- General method for the determination of melting range GB/T 2386-2014, Dyestuffs and intermediate of dyes -- Determination of moisture content GB/T 6678-2003, General principles for sampling chemical products GB/T 6682-2008, Water for analytical laboratory use -- Specification and test methods GB/T 8170-2008, Rules of rounding off for numerical values and expression and judgement of limiting values GB 12268-2012, List of dangerous goods GB 12463, General specifications for transport packages of dangerous goods GB 15258, General rules for preparation of precautionary label for chemicals GB 15603, General rules for the hazardous chemicals warehouse storage GB/T 16483, Safety Data Sheet for Chemical Products -- Content and Order of Sections GB 20814, Limit and determination of the quantity of heavy-metal elements in dye products GB/T 21876, Solvent dyes and intermediate of dyes -- Determination of ash content3 RequirementsThe quality requirements for p-aminophenol shall comply with the requirements in Table 1.4 Safety information4.1 Safety According to GB 12268-2012, p-aminophenol is designated as a dangerous good (UN. 2512). It is classified as Class 6.1, a toxic substance. It is flammable when exposed to open flames or high temperatures. It reacts with strong oxidants. It decomposes upon heating, releasing toxic and corrosive gases. Contact with hot surfaces can cause allergic reactions. Ingestion or inhalation of dust can cause death or health damage. Strict safety precautions must be observed during use and handling. 4.2 Safety data sheet According to GB/T 16483, p-aminophenol should be provided with a detailed safety data sheet before leaving the factory. The safety data sheet should include the following. a) Provide information on the hazards of the product; b) Instructions for safe use; c) Transportation and storage requirements; d) Protective measures; e) Emergency response measures and other safety information.5 SamplingSampling is conducted in batches. Manufacturers consider uniform products to be a batch. The number of samples collected per batch should comply with the requirements of Section 7.6 of GB/T 6678-2003.The packaging of the sampled products must be intact. Avoid the ingress of foreign matter into the product during sampling. Use a probe to collect samples from the upper, middle, and lower sections. The total sample volume should be no less than 500 g. After thoroughly mixing the samples, divide them into two clean, dry, well-sealed containers and label them. Indicate the product name, batch number, manufacturer name, sampling date, and location. Keep one container for inspection and one for future reference.6 Test methods6.1 General Unless otherwise specified, only reagents that are confirmed as analytically pure and Grade 3 water as specified in GB/T 6682-2008 are used. Standard titrant solutions, preparations, and products used in the tests, unless otherwise specified, are prepared and calibrated in accordance with GB/T 601 and GB/T 603.Test results are determined using the rounded value comparison method described in 4.3.3 of GB/T 8170-2008. 6.2 Appearance assessment Visual assessment is performed under natural northern daylight. 6.3 Determination of p-aminophenol mass fraction (amino value) 6.3.1 Determination principle Use diazotization method. The mass fraction of p-aminophenol is determined based on the principle that aromatic primary amines react with sodium nitrite to form diazonium salts in a low temperature and excess inorganic acid environment. 6.3.2 Reagents and solutions 6.3.2.1 Hydrochloric acid. 6.3.2.2 Potassium bromide solution. 100 g/L. 6.3.2.3 Sodium nitrite standard titration solution. c(NaNO2) = 0.1 mol/L; use starch- potassium iodide test paper to determine the endpoint during calibration. 6.3.2.4 Starch-potassium iodide test paper. 6.3.3 Determination steps Weigh approximately 0.25 g~0.30 g of the specimen (accurate to 0.0001 g) into a 250 ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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