GB/T 16632-2019 PDF EnglishUS$100.00 · In stock · Download in 9 seconds
GB/T 16632-2019: Determination of scale inhibition performance of water treatment chemicals - Calcium carbonate precipitation 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 16632: Historical versions
Similar standardsGB/T 16632-2019: Determination of scale inhibition performance of water treatment chemicals - Calcium carbonate precipitation 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/GBT16632-2019 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.040.40 G 76 Replacing GB/T 16632-2008 Determination of scale inhibition performance of water treatment chemicals - Calcium carbonate precipitation method Issued on. AUGUST 30, 2019 Implemented on. JULY 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Method summary... 4 4 Reagents or materials... 5 5 Instruments and apparatuses... 7 6 Test water... 7 7 Preparation of sample solution... 7 8 Test procedure... 8 9 Result calculation... 8 10 Allowable difference... 8ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 16632-2008, Determination of scale inhibition performance of water treatment agents - Calcium carbonate precipitation method; compared with GB/T 16632-2008, the main technical changes, except editorial changes, are as follows. -- Change the sodium bicarbonate standard solution to prepare when needed (see 4.4; 4.7 of version 2008); -- Add the requirement of using water for actual working conditions as test water (see Chapter 6); -- Change the addition of water treatment chemicals from “5.0 mL” to “a certain amount” (see 7.1.2, 7.1.3; 6.1 of version 2008); -- In the test procedure, change filter “after cooling to room temperature” to filter “while hot” (see Chapter 8; Chapter 7 of version 2008). This Standard was proposed by China Petroleum and Chemical Industry Federation. This Standard shall be under the jurisdiction of National Standardization Technical Committee of Chemical (SAC/TC 63). The drafting organizations of this Standard. Henan Qing Shui Yuan Technology Co., Ltd., Guangzhou Special Pressure Equipment Inspection and Research Institute, Hangzhou Special Equipment Testing and Research Institute, Nanjing Yushui Science & Technology Co., Ltd., Shenzhen ZhunNuo Test Technology Co., Ltd., Shandong Taihe Water Treatment Technologies Co., Ltd., Suzhou Branch of Special Equipment Safety Supervision Inspection Institute of Jiangsu Province, CenerTech Tianjin Chemical Research and Design Institute Co., Ltd., Jiashan Green Environmentally Friendly Materials Plant, Hangzhou Mingzhu Water Treatment Technology Co., Ltd., Tianjin Zhengda Science & Technology Co., Ltd. The drafters of this Standard. Jing Yuanyuan, Xie Haiyuan, Xiong Weidong, Chen Wei, Li Haitian, Wang Ningning, Yan Hao, Li Lin, Zhu Chunlian, Du Hao, Hu Sanmu, Shao Hongqian. The previous versions of the standards which are replaced by this Standard are. -- GB/T 16632-1996, GB/T 16632-2008. Determination of scale inhibition performance of water treatment chemicals - Calcium carbonate precipitation method1 ScopeThis Standard specifies the determination of scale inhibition performance of water treatment chemicals to inhibit calcium carbonate precipitation -- calcium carbonate precipitation method. This Standard applies to the evaluation of the scale inhibition performance of water treatment chemicals to inhibit calcium carbonate precipitation under the same conditions in the circulating cooling water system; it also applies to the screening of the water treatment chemicals to inhibit calcium carbonate scale formulation.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document. 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 6682, Water for analytical laboratory use - Specification and test methods3 Method summaryUse water for actual working conditions, or prepared water that contains a certain amount of bicarbonate radical and calcium ions AND water treatment chemicals to prepare into the test solution. Under heating conditions, promote the accelerated decomposition of calcium bicarbonate into calcium carbonate.4 Reagents or materials4.1 The reagents and water that are used in this standard, unless otherwise specified, shall be analytical reagents and grade-3 water that complies with the provisions of GB/T 6682. 4.2 Potassium hydroxide solution. 200 g/L. 4.3 Borax buffer solution. pH ≈ 9; weigh 3.80 g of sodium tetraborate decahydrate (Na2B4O7·10H2O) to dissolve in water; dilute to 1 L. 4.4 Sodium bicarbonate standard solution. 1 mL contains about 18.3 mg of HCO3-; prepare and calibrate according to the following steps. 4.5 Calcium chloride standard solution. 1 mL contains about 6.0 mg of Ca2+; prepare and calibrate according to the following steps. 4.6 Hydrochloric acid standard titration solution. c(HCl) is about 0.1 mol/L. 4.7 Ethylene Diamine Tetraacetic Acid standard titration solution. c (EDTA) is about 0.01 mol/L. 4.8 Bromocresol green-methyl red indicator solution5 Instruments and apparatuses5.1 Constant-temperature water bath. with stirring device; the temperature can be controlled at (80 ± 1) °C. 5.2 Conical flask. 500 mL; equipped with a rubber stopper for installing a glass tube whose diameter is 5 mm ~ 10 mm and length is about 300 mm.6 Test waterTest water sample. prepared water or water for actual working conditions.7 Preparation of sample solution7.1 Preparation of test solution 7.1.1 Water treatment chemical sample solution. 1.00 mL contains 0.500 mg of water treatment chemicals (on a dry basis). 7.1.3 Prepared water. add 250 mL of water in a 500 mL volumetric flask; use a burette to add a certain volume of calcium chloride standard solution, to make the amount of calcium ions 120 mg. 7.2 Preparation of blank test solution In another 500 mL volumetric flask, except that no water treatment chemical sample solution is added, operate according to the steps of 7.1.2 or 7.1.3.8 Test procedureRespectively place the test solution and the blank test solution in two clean conical flasks; immerse in a constant-temperature water bath of (80 ± 1) °C (the liquid level of the test solution shall not be higher than that of the water bath); keep at constant temperature for 10 hours. Use a medium-speed quantitative paper for dry filter while it is hot.9 Result calculationThe scale inhibition performance of the water treatment chemicals is calculated by η; the value is expressed in %; it is calculated according to Formula (3).10 Allowable differenceTake the arithmetic mean of the parallel determinations as the determination result. The absolute difference of parallel determination results shall not be greater than 2%. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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