GB/T 14571.1-2016 PDF EnglishUS$100.00 · In stock · Download in 9 seconds
GB/T 14571.1-2016: Test method of monoethylene glycol for industrial use - Part 1: Determination of acidity - Titration method 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 14571.1: Historical versions
Similar standardsGB/T 14571.1-2016: Test method of monoethylene glycol for industrial use - Part 1: Determination of acidity - Titration method---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/GBT14571.1-2016 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.080.60 G 16 Replacing GB/T 14571.1-1993 Test method of monoethylene glycol for industrial use - Part 1.Determination of acidity - Titration method Issued on. OCTOBER 13, 2016 Implemented on. MAY 01, 2017 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Test method A -- Manual titration method... 5 4 Test method B -- Potentiometric titration method... 7 5 Calculation... 9 6 Expression of analysis results... 9 7 Repeatability... 10 8 Test report... 10ForewordGB/T 14571 consists of the following parts. GB/T 14571.1, Test method of monoethylene glycol for industrial use - Part 1. Determination of acidity - Titration method GB/T 14571.2, Test method of ethylene glycol for industrial use - Part 2. Determination of purity and impurities - Gas chromatography GB/T 14571.3, Ethylene glycol for industrial use - Determination of content of total aldehydes present - Spectrophotometric method GB/T 14571.4, Ethylene glycol for industrial use - Determination of ultraviolet transmittance - Ultraviolet spectrophotometric method GB/T 14571.5, Test method of monoethylene glycol for industrial use - Part 5. Determination of chloride ion - Ion chromatography This Part is Part 1 of GB/T 14571. This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 14571.1-1993.Compared with GB/T 14571.1-1993, main technical changes in this Part are as follows. - added the scope (see Clause 1 of this Edition, Clause 1 of Edition 1993); - added potentiometric titration method (see Clause 4 of this Edition); - modified the unit of acidity from % (mass fraction) to mg/kg. This Part was proposed by China Petrochemical Corporation. This Part shall be under the jurisdiction of Subcommittee on Petrochemical of National Technical Committee on Chemicals of Standardization Administration of China (SAC/TC 63/SC4). The drafting organization of this Part. China Petroleum & Chemical Corporation Beijing Yanshan Branch. Main drafters of this Part. Qi Guiyi, Cui Guanghong, Jiang Liancheng, Yu Hongguang, Cheng Hong. Version of standard substituted by this Part is. - GB/T 14571.1-1993. Test method of monoethylene glycol for industrial use - Part 1.Determination of acidity - Titration method WARNING. This Part is not intended to describe all security issues related to its use. It is the responsibility of the user to take appropriate safety and health measures to ensure the compliance with relevant national regulations.1 ScopeThis Part of GB/T 14571 specifies manual titration method and potentiometric titration method for determination of acidity of monoethylene glycol for industrial use. Manual titration method of this Part is applicable to the determination of monoethylene glycol for industrial use of which the acidity is 2mg/kg~200mg/kg. Potentiometric titration method is applicable to the determination of monoethylene glycol for industrial use of which the acidity is 1mg/kg~200mg/kg.2 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 601, Chemical reagent - Preparations of reference titration solutions GB/T 603, Chemical reagent - Preparations of reagent solutions for use in test methods GB/T 3723, Sampling of chemical products for industrial use - Safety in sampling GB/T 6680, General rules for sampling liquid chemical products GB/T 6682, Water for analytical laboratory use - Specification and test methods GB/T 8170, Rules of rounding off for numerical values & expression and judgement of limiting values3 Test method A -- Manual titration method3.1 Method summary Dissolve monoethylene glycol sample in water. Use sodium hydroxide standard solution to titrate acid in the sample. Use phenolphthalein indicator liquid discoloration to indicate the titration end. Calculate the sample acidity according to the amount of sodium hydroxide standard solution consumed, in acetic acid (mg/kg). 3.2 Reagents and materials 3.2.1 Unless otherwise stated, all reagents are analytical reagents. All standard solutions, preparations used are prepared according to GB/T 601 or GB/T 603. All water used meet the specification of grade three specified in GB/T 6682. 3.3 Instruments and devices 3.3.1 Analytical balance. resolution is 0.0001g. 3.3.2 Erlenmeyer. 500mL, with open grinder and nitrogen blowpipe, as shown in Figure 1. 3.4 Sampling Perform sampling according to the requirements specified in GB/T 3723 and GB/T 6680. 3.5 Analysis steps Make access of nitrogen to a 500mL Erlenmeyer at a flow rate of 300mL/min~500mL/min for about 5min. Under nitrogen-access conditions, use a measuring cylinder to measure and take 100mL of water into the Erlenmeyer.4 Test method B -- Potentiometric titration method4.1 Method summary Use sodium hydroxide standard solution to titrate acid in monoethylene glycol sample. Use potentiometric titrator to titrate and determine the end. Calculate the sample acidity according to the amount of sodium hydroxide standard solution consumed, in acetic acid (mg/kg). 4.2 Reagents and materials 4.3 Instruments and devices 4.3.1 Potentiometric titrator. 5mL burette; be able to realize constant or dynamic increment mode; be able to titrate in increments of 0.02mL or more. 4.4 Instrument preparation 4.4.1 Boot preparation Start the titrator according to the instruction manual. Start blender. Control blending speed. It is better to not generate vortex. Make sure there are no bubbles in the burette. 4.4.2 Electrode preparation and maintenance Store and use electrodes according to manufacturer description. Before each titration, the electrode shall be immersed in water for at least 2min. 4.4.3 Instrument calibration Respectively place 50mL of two buffer solutions of which pH values are about 4.0 and 7.0 into 125mL beakers. Perform instrument calibration according to the requirements of manufacturer’s instruction manual. Immerse the electrode in buffer solution. 4.5 Sampling Sampling requirements are same as 3.4. 4.6 Analysis steps 4.6.1 Weigh (85±5)g of monoethylene glycol sample in the titration beaker, to the nearest of 0.001g.5 CalculationThe monoethylene glycol acidity wi (in acetic acid), in mg/kg, is calculated according to formula (1).6 Expression of analysis resultsFor any sample, report the results of the analysis by the arithmetic mean of the results of two repeated measurements. Round off according to the provisions of GB/T 8170, to the nearest of 0.1mg/kg.7 RepeatabilityIn the same laboratory, the same operator uses the same device. According to the same test method, test the same test object independently of each other in a short time.8 Test reportThe test report shall contain the following information. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 14571.1-2016 be delivered?Answer: The full copy PDF of English version of GB/T 14571.1-2016 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 14571.1-2016_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 14571.1-2016_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 14571.1-2016 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.Question 5: Should I purchase the latest version GB/T 14571.1-2016?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 14571.1-2016 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.How to buy and download a true PDF of English version of GB/T 14571.1-2016?A step-by-step guide to download PDF of GB/T 14571.1-2016_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 14571.1-2016". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
