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GB/T 9823-2008: Inspection of grain and oils -- Determination of total nitrogen content
Status: Obsolete GB/T 9823: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 9823-2008 | English | 239 |
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Inspection of grain and oils -- Determination of total nitrogen content
| Obsolete |
GB/T 9823-2008
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| GB/T 9823-1988 | English | 199 |
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Method for determination of total nitrogen content in oilseed residues
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GB/T 9823-1988
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PDF similar to GB/T 9823-2008
Standard similar to GB/T 9823-2008 GB 7718 GB/T 5532 GB 7718 GB/T 5494 Basic data | Standard ID | GB/T 9823-2008 (GB/T9823-2008) | | Description (Translated English) | Inspection of grain and oils -- Determination of total nitrogen content | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | X04 | | Classification of International Standard | 67.200 | | Word Count Estimation | 6,663 | | Date of Issue | 2008-11-04 | | Date of Implementation | 2009-01-20 | | Older Standard (superseded by this standard) | GB/T 9823-1988 | | Quoted Standard | GB/T 601; GB/T 10358; GB/T 10360 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.18 (Total No.131) | | 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 total nitrogen content of plant oilseed determination of terms and definitions, analysis step, , sample preparation, reagents, , instrument principles calculated results and repeatability. This standard applies to the determination of total nitrogen content of the meal with a crushing method or leaching plant oil obtained after treatment. This standard does not apply to plant oilseed products from the resulting composite. | GB/T 9823-2008: Inspection of grain and oils -- Determination of total nitrogen content---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.
Inspection of grain and oils. Determination of total nitrogen content
ICS 67.200
X04
National Standards of People's Republic of China
Replacing GB/T 9823-1988
Inspection of grain and oilseed plants
Determination of total nitrogen content
Posted 2008-11-04
2009-01-20 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard is GB/T 9823-1988 "oilseed total nitrogen assay" amendments.
This standard and GB/T 9823-1988 main technical differences are as follows.
--- The standard name be changed to "Inspection of grain and oilseed plant total nitrogen content determination";
--- Added "Terms and Definitions";
--- Added "semi/fully automatic Kjeldahl distillation apparatus";
--- Increase the repeatability requirements.
From the date of implementation of this standard instead of GB/T 9823-1988.
The standard proposed by the National Food Authority.
This standard by the National Standardization Technical Committee OILS.
This standard is drafted by. Huazhong Agricultural University.
Drafters of this standard. Huang, Zhangke Tian, \u200b\u200bLiu Yin, Wu Wei Guan, XF.HE, Mei Guangming, Li Fu Jie, meditation, Wang Yi.
This standard replaces the standards previously issued as follows.
--- GB/T 9823-1988.
Inspection of grain and oilseed plants
Determination of total nitrogen content
1 Scope
This standard specifies the oilseed plant total nitrogen determination of terms and definitions, principle, reagents, instruments, sample preparation, analysis step junction
If the calculation and repeatability.
This standard applies to the determination of total nitrogen content of the meal with a compression method or leaching plant oil obtained after treatment.
This standard does not apply to plant oilseed products from the resulting composite.
2 Normative references
The 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.
Preparation of GB/T 601 chemical reagent standard titration solution
GB/T 10358 oilseed moisture and volatile matter content was measured (GB/T 10358-2008, ISO 771. 1977, IDT)
GB/T 10360 for sampling oilseed residues (GB/T 10360-2008, ISO 5500. 1986, IDT)
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1
Plant oil residue after pressing or leaching process.
Principle 4
In the presence of a catalyst, sulfuric acid digestion of organic matter in the sample, so that nitrogen was converted into ammonium sulfate. Adding alkali and distillation of ammonia slip
That, after absorption with boric acid, hydrochloric acid standard solution titration, calculate the total nitrogen content.
5 Reagents
Unless otherwise indicated, the reagents used were of analytical grade, test water is distilled water.
5.1 of concentrated sulfuric acid. 18mol/L.
5.2 copper sulfate (CuSO4 · 5H2O).
5.3 potassium sulfate.
5.4 400g/L sodium hydroxide solution. Weigh 40g of sodium hydroxide (NaOH), dissolved in water and dilute to 100mL.
5.5 20g/L boric acid solution. Weigh 2g of boric acid (H3BO3), dissolved in water and dilute to 100mL.
Mixed indicator 5.6. 1 parts by 1g/L methyl red in ethanol (95%) and 5 parts of a solution of 1g/L of bromocresol green in ethanol (95%) was uniformly mixed.
5.7 boric acid absorption solution (with automatic program). 10g L boric acid solution 1000mL /, was added 1g/L bromocresol green ethanol (95%) solution
10mL, 1g/L methyl red in ethanol (95%) was added 7mL, 400g/L aqueous solution of sodium hydroxide 0.5mL, mix well.
5.8 hydrochloric acid standard titration solution. Ba (HCl) = 0.01mol/L, according to GB/T 601 was prepared.
5.9 hydrochloric acid standard volumetric solution (half/full-auto program used). Ba (HCl) = 0.1mol/L, according to GB/T 601 was prepared.
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