Chinese Standard: 'JJG 877-2011'
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| JJG 877-2011 | English | 419 |
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Verification Regulation of Vapor Pressure Osmometers
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JJG 877-2011
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| JJG 877-2011 | Chinese | 17 |
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| Standard ID | JJG 877-2011 (JJG877-2011) | | Description (Translated English) | Verification Regulation of Vapor Pressure Osmometers | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A53 | | Classification of International Standard | 17.100 | | Word Count Estimation | 18,164 | | Date of Issue | 2011-11-14 | | Date of Implementation | 2012-05-14 | | Older Standard (superseded by this standard) | JJG 877-1994 | | Drafting Organization | China Institute of Metrology | | Administrative Organization | National Technical Committee of Physics stoichiometric measurement | | Regulation (derived from) | AQSIQ Announcement No. 165 of 2011 | | Issuing agency(ies) | State Administration of Quality Supervision, Inspection and Quarantine | | Summary | This standard applies to the determination of the number-average molar mass at 1 �� 10000g �� mol-1 below the vapor pressure of the polymer permeability tester (also known as gas osmotic device, referred to as VPO) of the initial verification, testing and use of follow-up checks. | JJG 877-2011
Verification Regulation of Vapor Pressure Osmometers
State verification procedures People's Republic of China
Vapor pressure osmometer
Issued on. 2011-11-14
2012-05-14 implementation
The State Administration of Quality Supervision, Inspection and Quarantine released
Vapor Pressure Osmometer verification procedures
Vap
Replacing JJG 877-1994
The regulations by the State Administration of Quality Supervision, Inspection and Quarantine on November 14, 2011 for approval and self
From May 14, 2012 into effect.
Focal point. the National Technical Committee stoichiometric physical
The main drafting units. China Institute of Metrology
Participated in the drafting. Leipzig letter (China) Technology Development Co., Ltd.
This procedure commissioned the National Technical Committee of the stoichiometric physics responsible for the interpretation
The main drafters of this procedure.
Qi Xin (China Institute of Metrology)
Repair Hongyu (China Institute of Metrology)
Drafters participate.
Liu member (Leipzig letter (China) Technology Development Co., Ltd.)
table of Contents
1 Scope (1)
2 Overview (1)
3 metering performance requirements (1)
4 General Requirements (2)
4.1 Visual inspection (2)
4.2 boot check (2)
5 control of measuring instruments (2)
5.1 verification Conditions (2)
5.2 test equipment and certified reference materials (2)
5.3 test items and test methods (2)
5.4 test results processing (4)
5.5 test cycle (4)
Appendix A instrument parameters (K) calibration method (5)
Appendix B solution preparation concentration range table (7)
Appendix C of polystyrene and dextran CRMs solution preparation method (8)
Appendix D vapor pressure osmometry common solvents suitable measuring temperature and concentration range reference table (9)
Appendix E Vapor Pressure Osmometer test record format (11)
Vapor Pressure Osmometer verification procedures
1 Scope
The order applies to the determination of the number average molar mass in 1 × 104g · mol-1 or less polymer vapor pressure osmometry
(Also known as vapor pressure osmometer, Acronym VPO) initial verification, use and subsequent verification check.
2 Overview
Vapor pressure osmometer is determined on the basis of a non-volatile solvent vapor high pressure drop caused by the principles of solute in solution
Number-average molar mass of the copolymer Mn. There are two good matches thermistor probe in the instrument, placed in a sealed constant
Warm, filled with some kind of saturated vapor pond pure solvent. When the same pure solvent drops are hanging on the two thermistor probes
When, due to the vapor pressure of the solvent is the same, no solvent vapor condensation heat generation, thus reflecting the two thermistor temperature probes
Difference is zero. If one drops a thermistor probe was replaced with a solution containing the same solvent, since the solvent of the solution was evaporated
Low pressure, solvent molecules will gather from the saturated vapor phase into the solution drops, release condensation heat, the temperature of the solution drops
Increased. At equilibrium, the temperature difference between the two thermistor probes generated. This difference can be converted into an instrument electronic measuring system
Response amount, and solute response number-average molar mass (Mn), there is a relationship between the concentration (ci).
That is an inherent value in response to different concentrations (Δdi/ci) for the vertical axis, concentration (ci) as the abscissa, plotted and
Get a straight line. Linear intercept (Δdi/ci) c → 0 by extrapolation, calculated by the formula (1) obtained.
Δdi
ic → 0
= KMn
(1)
Mn = KΔdi
ic → 0
(2)
Where. K --- instrument parameters;
--- Number of Mn average molar mass of the sample;
ci --- concentration;
Δdi --- response temperature difference value;
Δdi
ic → 0
--- Value inherent response.
3 metering performance requirements
Performance measurement instrumentation requirements are listed in Table 1.
Table 1 metrological requirements
No. test items measured performance indicators
1 instrument sensitivity inspection> 100 value
2 measuring chamber temperature indication error does not exceed ± 0.2 ℃
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