GB/T 21780-2008 English PDFUS$254.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 21780-2008: Particle size analysis -- Sedimentation analysis in the gravitational field -- Pipette method Status: Valid
Basic dataStandard ID: GB/T 21780-2008 (GB/T21780-2008)Description (Translated English): Particle size analysis -- Sedimentation analysis in the gravitational field -- Pipette method Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A80 Classification of International Standard: 13.300 Word Count Estimation: 13,151 Date of Issue: 2008-05-12 Date of Implementation: 2008-09-01 Quoted Standard: DIN 323; DIN 12242; DIN 12336; DIN 12553; DIN 12690 Adopted Standard: DIN 66115-1993, IDT Regulation (derived from): Announcement of Newly Approved National Standards No. 7, 2008 (No. 120 overall) 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 the use of the gravitational field of the sedimentation analysis particle size analysis pipette method. This standard is applicable to measurement of a pipette in a liquid dispersion of solid materials in the cumulative particle size distribution curve, the use of sedimentation pipette device equivalent diameter range 1��m ~ 250��m. GB/T 21780-2008: Particle size analysis -- Sedimentation analysis in the gravitational field -- Pipette method---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. Partical size analysis. Sedimentation analysis in the gravitational field. Pipette method ICS 13.300 A80 National Standards of People's Republic of China Particle size analysis of the gravitational field settlement analysis Pipette method Posted 2008-05-12 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released ForewordThis standard is identical with DIN66115. 1983 "sedimentation particle size analysis of the gravitational field analysis pipette Law" (in German). For ease of use, this standard, the following editorial changes. --- Information about the standard editing instructions of the preamble; "." --- With a decimal point instead of a comma as the decimal point, ""; --- Renumbered; --- Renumbered comment; --- Dynamic viscosity units to mPa · s, and the number of related equations were modified; --- Based on other standards, settling velocity equation symbol equivalent diameter from dS to X; --- Joined the "scope" and "Method Description" and other sections, while some of the text has been edited proofreading; --- Increasing the normative references explanatory preamble; --- The DIN66115. 1983 original German standard "other criteria" classification to "References"; --- The DIN66115. 1983 original German standard "evaluation case" categorized as "Appendix A"; --- The DIN66115. 1983 original German standard "formula symbol" classification to "Appendix B". Appendix B of this standard is a normative appendix, Appendix A is an information appendix. This standard is managed by the National Standardization Technical Committee chemicals dangerous (SAC/TC251) and focal points. This standard was drafted. Guangdong Entry-Exit Inspection and Quarantine of Liaoning. The main drafters of this standard. Zhong Zhiguang, Xiaoda Hui, of Interferon Li Chengming, Di Cuiping, Man Mo, Zhang Haifeng, Zheng Jianguo, Li Qingxiang. This standard is the first release. Particle size analysis of the gravitational field settlement analysis Pipette method1 ScopeThis standard specifies the use of the gravitational field of settlement analysis - pipette method particle size analysis method. This standard applies to regulations pipette Measurement dispersed in the liquid accumulated solids particle size distribution curve (in line with DIN66141 Be), the settling velocity of the pipette device used equivalent diameter in the range of 1μm ~ 250μm.2 Normative referencesThe following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. DIN323 Part 1 standard and the main value of the standard number of coefficients, the exact value, rounding value DIN12242 Part 1 for laboratory glassware can be replaced with a conical ground joint specification error connected DIN12336 laboratory glassware flat evaporating dish DIN12553 laboratory glassware with a tapered leading bidirectional parallel drilling Capacity DIN12690 laboratory glassware marked by pipette Class A and Class B DIN66111 particle size analysis of the gravitational field analysis theory Settlement Describe the principles of particle size analysis DIN661413 Principles and Methods Description3.1 Principle Pipette apparatus shown in FIG. 1 (also referred to as "straw Andresen type" [1]) of the settling tank by a liquid-absorbent and sampling tubes. be usable The instrument used to measure the concentration of suspended solids in the settling tank above the bottom of the measuring plane. The measured concentration and diffusivity D Suitably proportioned. Particle size distribution curve can be obtained directly in the form of settling velocity function; it is calculated, or by some kind of settlement Was, in the still liquid dispersion of solid matter [1] - [6] sedimentation rate equivalent diameter X. Experimenter in accordance with pre-established timetable, lessons sample dispersion volume Vp from the measurement plane, and by evaporating liquid sedimentation methods Mass concentration C m1, m1 = 0 0/V0 (the so-called standard sample), the ratio between the two is the diffusivity D. D = C m1 C m, n = 0 M1 V0 M1 0 Vp (1) Typically, each of the suction volume of the suspension shift are equal, so V0/Vp = 1, the rate of diffusion. D = m1 m1 0 (1a) If the shift is known suction volume Vp = V0, and the same is known in suspension solids concentration C m1, 0, m1 is 0 may be calculated. Diffusivity either directly expressed as a function of the settling velocity. 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