GB/T 7381-2010 English PDFUS$169.00 ยท In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 7381-2010: Surface active agents -- Determination of stability in hard water Status: Valid GB/T 7381: Historical versions
Basic dataStandard ID: GB/T 7381-2010 (GB/T7381-2010)Description (Translated English): Surface active agents -- Determination of stability in hard water Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G72 Classification of International Standard: 71.100.40 Word Count Estimation: 7,746 Date of Issue: 2011-01-14 Date of Implementation: 2011-12-01 Older Standard (superseded by this standard): GB/T 7381-1993 Quoted Standard: GB/T 6367 Adopted Standard: ISO 1063-1974, MOD Regulation (derived from): National Standard Approval Announcement 2011 No.2 Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China Summary: This standard specifies a method for surfactants in hard water stability determination. This standard applies when a certain temperature, the stability of surfactant in hard water soluble in water. GB/T 7381-2010: Surface active agents -- Determination of stability in hard water---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Surface active agents.Determination of stability in hard water ICS 71.100.40 G72 National Standards of People's Republic of China Replacing GB/T 7381-1993 Surfactant Determination of stability in hard water (ISO 1063. 1974, MOD) 2011-01-04 released 2011-12-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released ForewordThis standard replaces GB/T 7381-1993 "Determination of stability of surfactants in hard water". The main differences between this standard and the original standard. - format written according to GB/T 1.1-2009 "Standardization of work guidelines Part 1. Standard structure and preparation"; --- Added foreword; - Added terms and definitions; --- Added test report section. This standard uses the re-drafting method to modify ISO 1063. 1974 "Determination of Surfactant Stability in Hard Water". The main differences between this standard and ISO 1063. 1974. - in the preparation of the test solution to increase the centrifugal separation of the treatment; - the capacity of the test tube is not specified; - specifies the sample weighing accuracy; --- Added a small amount of precipitation or agglomerates and a large number of precipitation or agglomerates scoring criteria. This standard is proposed by the China Petroleum and Chemical Industry Association. This standard is owned by Shanghai Dyestuff Research Institute Co., Ltd. The drafting unit. Shanghai Dyestuff Research Institute Co., Ltd., Zhejiang Synthetic Chemical Co., Ltd. The main drafters of this standard. Zhuang Yongbin, Tang Fuwei, Huang Weijing. This standard replaced the previous version of the standard release. --- GB/T 7381-1987, GB/T 7381-1993. Surfactant Determination of stability in hard water1 ScopeThis standard specifies a method for determining the stability of surfactants in hard water. This standard is applicable to the determination of surfactant stability in water that is readily soluble in water at a certain temperature.2 normative reference documentsThe following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this file. For undated references, the latest edition (including all modifications) applies to this document. GB/T 6367 Surfactant Known Calcium Hardness Water Preparation (GB/T 6367-1997, idtISO 2174..1990)3 terms and definitions3.1 Hard water Refers to the presence of soluble alkaline earth compounds, especially calcium salts. Expressed in millimoles of calcium per liter. 3.2 Surfactant stability in hard water surfaceactiveagents'stabilityinhardwater Is determined by the solubility of the compound formed by the surfactant and calcium ion exchange, or by the ionic force, the salt effect, and the like To decide.4 principleSurfactants are ion-exchanged between hard water and calcium ions (magnesium ions) to form a compound, depending on its solubility or The stability of the surfactant in hard water can be determined by the principle of ionic force, salt effect and so on. Mixing the different concentration of the surfactant solution with an aqueous solution of different known calcium hardness, allowing the mixture to stand under the prescribed conditions, Observation of its appearance can be divided into. clear, milky, turbid, a small amount of precipitation or aggregates, a large number of precipitation or aggregates. Since there is no fundamental difference between calcium hardness and magnesium hardness, this method is represented by calcium hardness.5 reagents and materials5.1 General Prepared according to GB/T 6367. 5.2 hard aqueous solution 5.2.1 hard aqueous solution S1. c (1/2Ca2) = 6mmol/L. ...... |
