GB/T 28723-2012 English PDF

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GB/T 28723-2012: Determination of purity for chemicals (pharmaceuticals) -- Differential scanning calorimetry (DSC)
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 28723-2012	209	Add to Cart	3 days	Determination of purity for chemicals (pharmaceuticals) -- Differential scanning calorimetry (DSC)	Valid

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Basic data

Standard ID: GB/T 28723-2012 (GB/T28723-2012)
Description (Translated English): Determination of purity for chemicals (pharmaceuticals) -- Differential scanning calorimetry (DSC)
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G04
Classification of International Standard: 71.040.01
Word Count Estimation: 9,992
Quoted Standard: ASTM E967; ASTM E968
Regulation (derived from): National Standards Bulletin No. 24 of 2012
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 purity of solid organic chemicals measured by differential scanning calorimetry. This standard applies to a clear melting point of the thermal stability of determining the purity of the solid organic chemicals, which gives a to

GB/T 28723-2012: Determination of purity for chemicals (pharmaceuticals) -- Differential scanning calorimetry (DSC)

---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.
Determination of purity for chemicals (pharmaceuticals) .Differential scanning calorimetry (DSC) ICS 71.040.01 G04 National Standards of People's Republic of China Purity of solid organic chemicals Differential scanning calorimetry Determinationofpurityforchemicals (pharmaceuticals) - Differentialscanningcalorimetry (DSC) Issued on. 2012-09-03 2013-02-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. The standard reference method using redrafted ASTME928-2008 "Standard Test Method for differential scanning calorimetry determination of purity." (Standardtestmethodfordeterminationofpuritybydifferentialscanningcalorimetry) preparation. The standard proposed by China Petroleum and Chemical Industry Association. This standard by the National Standardization Technical Committee Chemistry (SAC/TC63) centralized. This standard was drafted. CIQ Shandong, Shandong Provincial Academy of Inspection and Quarantine Science and Technology, Guangdong Entry-Exit Inspection and Quarantine Bureau. The main drafters of this standard. Wang Yan, Lin Yu Fei, Ji Lei, Sun Jian, Duheng Qing, Cai hair, Ma Xin, Cheng Gang, high Mei Sheng-eagles, Harpole, Chen Gufeng, Fei. Purity of solid organic chemicals Differential scanning calorimetry

1 Scope

This standard specifies the solid organic chemical purity determination of differential scanning calorimetry. This standard applies to the determination of the purity of a clear melting point thermally stable solid organic chemicals, which gives the total content of impurities in the sample Volume, but not the content of a single draw impurities.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. ASTME967 differential scanning calorimeter and temperature calibration standard methods of differential thermal analyzer (Standardpracticefortemper- aturecalibrationofdifferentialscanningcalorimetersanddifferentialthermalanalyzers) Heat flux calibration method ASTME968 standard differential scanning calorimeter (Standardpracticeforheatflowcalibration ofdifferentialscanningcalorimeters)

3 Method summary

DSC purity determination, based on the melting point of the material decreases with increasing impurity content of this nature, by van Hoof (Van'tHoff) Party Cheng quantitative description. Enclosed sample dish known mass of the sample, by differential scanning calorimetry of the samples in the sample dish during the phase transition Enthalpy change of temperature records, enthalpy - temperature curve obtained by integrating the phase change in enthalpy, mathematical models of phase transition over Enthalpy temperature process becomes a programmatic processing of the sample to calculate the content of impurities, to obtain a sample purity.

4 test device

4.1 differential scanning calorimeter, including the following sections. a) differential scanning calorimetry pool, at the test temperature range with a steady heating rates of the sample and the reference material is heated, and the temperature sensor Device (precision 0.1 ℃) monitoring the sample temperature, the energy differential energy sensor monitors sample and the difference between the reference (accuracy 10μW), Capable of providing (15 ~ 25) mL/min (flow rate accuracy of 1mL/min) of an inert gas such as nitrogen; b) temperature control means, in order to be able to sample (0.3 ~ 0.7) ℃/min (temperature control accuracy of 0.01 ℃/min) temperature-programmed; c) integrator, integrating precision of 1%. 4.2 Sample dish. sealed sample cell, the sample according to the sample case chose not to react with the sample cell. Usually aluminum pan, for a particular Or high-temperature test, you can use a ceramic or platinum sample pan. 4.3 Pressure Prototype. seal pressure can be like. 4.4 Analysis of balance. weighing accuracy of 0.01mg.

5 Materials and Reagents

5.1 n-hexane, chromatography. ......

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