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GB/T 9740-2008: Chemical reagent -- General method for the determination of dry residue after evaporation
Status: Valid GB/T 9740: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 9740-2008 | English | 169 |
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Chemical reagent -- General method for the determination of dry residue after evaporation
| Valid |
GB/T 9740-2008
|
| GB/T 9740-1988 | English | 199 |
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Chemical reagent--General method for the determination of dry residue after evaporation
| Obsolete |
GB/T 9740-1988
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PDF similar to GB/T 9740-2008
Basic data | Standard ID | GB/T 9740-2008 (GB/T9740-2008) | | Description (Translated English) | Chemical reagent -- General method for the determination of dry residue after evaporation | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G60 | | Classification of International Standard | 71.040.30 | | Word Count Estimation | 7,719 | | Date of Issue | 2008-05-15 | | Date of Implementation | 2008-11-01 | | Older Standard (superseded by this standard) | GB/T 9740-1988 | | Adopted Standard | ISO 6353-1-1982, NEQ | | Regulation (derived from) | National Standard Approval Announcement 2008 No.8 (Total No.121) | | 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 provides a common method for determining evaporation residue by gravimetric method. This standard applies to be volatile in the boiling water bath temperature and measuring the residue of the net addition to the main chemical reagent evaporation. When measured by the standard evaporation residue, residue quality specifications according to sample size and the resulting value is not less than 1 mg. | GB/T 9740-2008: Chemical reagent -- General method for the determination of dry residue after evaporation
---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.
Chemical reagent. General method for the determination of dry residue after evaporation
ICS 71.040.30
G60
National Standards of People's Republic of China
Replacing GB/T 9740-1988
Chemical Reagents
General method for determination of evaporation residue
(ISO 6353-1. 1982, Reagentsforchemicalanalysis-
Part 1. Generaltestmethods, NEQ)
Posted 2008-05-15
2008-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard and ISO 6353-1. 1982 "Chemical analysis of reagent --- Part 1. General test method" non-equivalent.
This standard replaces GB/T 9740-1988 "General Chemical Reagents evaporation residue determination method", compared with the GB/T 9740-1988 Main
To change the following.
--- Modify the determining step (1988 edition, Chapter 4, Chapter 4 of this edition).
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee Chemistry Chemicals Branch (SAC/TC63/SC3) centralized.
This standard was drafted. Guangzhou Chemical Reagent Factory.
The main drafters of this standard. Fuqiong Lian, Yu Xiaoqi, Liu Chao Yuan.
This standard was first published in 1988.
Chemical Reagents
General method for determination of evaporation residue
1 Scope
This standard specifies the general method for the determination of the evaporation residue by gravimetric method.
This standard applies to boiling water can be evaporated at bath temperature and the residue was determined in addition to the main chemical agents net evaporation. Determination of steam by this standard
When hair residue, according to the sample size and specifications of the calculated value of the resulting residue mass not less than 1mg.
2 principle of the method
Using differential sample body and volatile nature of the residue, the sample was evaporated to dryness in a water bath, and dried in an oven to constant weight the sample body
Completely separated from the residue, the available balance that the quality of the residue.
3 Instrument
3.1 General laboratory equipment.
3.2 evaporating dish. Depending on the nature of the sample, the choice of material of platinum, quartz, borosilicate glass, or ceramic.
3.3 water bath.
3.4 electric oven. the temperature can be maintained at 105 ℃ ± 2 ℃.
3.5 Analytical balance. Indexing is 0.1mg.
4 Determination
A predetermined amount of sample, has been placed at 105 ℃ ± 2 ℃ constant, regulations evaporating dish in the sample below the boiling temperature of the steam bath
Dry, and dried to a constant weight at 105 ℃ ± 2 ℃ in an electric oven.
5 Calculation
Mass percentage evaporated residue, expressed in%, according to equation (1) or (2) Calculated.
2- 1 = m1 m1 m1 × 100
(1)
2 m1 = m1 2-
ρ · Vp
× 100 (2)
Where.
Value m1 2 --- empty dish and residue mass in grams (g);
Value m1 --- empty dish mass in grams (g);
--- Value m1 mass of the sample in grams (g);
P --- liquid sample values \u200b\u200bof the density in grams per milliliter (g/mL);
--- Value Vp liquid sample volume in milliliters (mL).
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