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GB/T 22427.11-2008: Starches and derived products -- Determination of total phosphorus content
Status: Obsolete
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 22427.11-2008 | English | 239 |
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Starches and derived products -- Determination of total phosphorus content
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GB/T 22427.11-2008
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Basic data | Standard ID | GB/T 22427.11-2008 (GB/T22427.11-2008) | | Description (Translated English) | Starches and derived products -- Determination of total phosphorus content | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | X11 | | Classification of International Standard | 67.180.20 | | Word Count Estimation | 6,632 | | Date of Issue | 2008-10-19 | | Date of Implementation | 2009-03-01 | | Older Standard (superseded by this standard) | GB/T 12092-1989 | | Adopted Standard | ISO 3946-1982, IDT | | Regulation (derived from) | National Standard Approval Announcement 2008 No.17 (Total No.130) | | 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 method for spectrophotometric determination of the total content of starch and its derivatives in phosphorus. This standard applies to the total phosphorus content of starch and its derivatives does not exceed 5% of the sample. | GB/T 22427.11-2008: Starches and derived products -- Determination of total phosphorus 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.
Starches and derived products. Determination of total phosphorus content
ICS 67.180.20
X11
National Standards of People's Republic of China
GB/T 22427.11-2008/ISO 3946. 1982
Replacing GB/T 12092-1989
Determination of total phosphorus content of starch and its derivatives
(ISO 3946. 1982, Starchesandderivedproducts-Determinationoftotal
phosphoruscontent-Spectrophotometricmethod, IDT)
Posted 2008-10-19
2009-03-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard is identical with ISO 3946. 1982 "total phosphorus content of starch and its derivatives spectrophotometry" (in English), the contents of
And structure of ISO 3946. 1982 is consistent, only made editorial changes.
This standard replaces GB/T 12092-1989 "total content of starch and its derivatives phosphorus determination."
This standard and GB/T 12092-1989 compared to major changes are as follows.
--- Standard name changed to "total determination of phosphorus content of starch and its derivatives";
--- Improve the standard format, according to the International System of Units standardized units;
--- Added "8 test report."
This standard is proposed and managed by China General Chamber of Commerce.
This standard was drafted. Chinese Chamber of Commerce Business Standard centers, food, Jiangnan University, China Starch Industry Association modified starch
Professional Committee, Tianjin peak Starch Development Company Limited.
The main drafters of this standard. Guzheng Biao, Hong Yan, Cheng Li, Chen Hongxing, Liu Zhimin, Laiyi Han, Jin Xiaolei.
GB/T 22427.11-2008/ISO 3946. 1982
Determination of total phosphorus content of starch and its derivatives
1 Scope
This standard specifies the method for spectrophotometric determination of the total content of starch and its derivatives of phosphorus.
This standard applies to starch and its derivatives sample total phosphorus content of not more than 5% (mass fraction).
2 Terms and definitions
The following terms and definitions apply to this standard.
2.1
The measured phosphorus content in accordance with the method specified in this standard.
Principle 3
Sulfuric acid - a mixture of nitric acid digestion and destroy organic matter and phosphate into orthophosphate, by reducing the role of the formation known as
Molybdenum blue phosphomolybdate, determined by spectrophotometry at 825nm blue absorbance wavelength.
4 Reagents
Use analytical grade reagents and distilled water or equivalent purity.
4.1 sulfuric acid - a mixed solution of nitric acid. one volume of sulfuric acid [Ba = 96% (mass fraction), ρ20 = 1.84g/mL] and a volume of nitric acid
(4.2) and mixed.
4.2 nitrate. Ba = 65% (mass fraction), ρ20 = 1.38g/mL.
4.3 ascorbic acid solution. Ba = 50g/L, the solution was stored in a refrigerator up to no more than 48h.
4.4 molybdate solution. 10.6g paramolybdate tetrahydrate compound [(NH4) 6 · Mo7O24 · 4H2O] was dissolved in 500mL of water and transferred to
1000mL flask was added 500mL of 10mol/L sulfuric acid solution in the mixing and cooled to room temperature.
4.5 Sodium hydroxide solution. Ba = 10mol/L.
4.6 Phosphorus standard solution
4.6.1 Standard stock solution. Weigh anhydrous potassium dihydrogen phosphate 0.4393g (accurate to 0.5mg), dissolved in water, and then quantitatively transferred to 1000mL
Flask with water to volume, mix, 1mL standard stock solution containing 100μg of phosphorus.
Note. Before using potassium dihydrogen phosphate shall, electric oven drying 1h (oven temperature controlled at 105 ℃ ± 2 ℃), cooled to a desiccator
Room temperature.
4.6.2 standard solution. Pipette 10mL with stock standard solution (4.6.1) into 250mL volumetric flask, water to the moment
Degree and shaken. 1mL standard solution containing 4μg phosphorus.
5 Instruments
5.1 flask. 50mL, 100mL, 200mL, 250mL and 500mL.
5.2 conical flask. 50mL.
5.3 digest bottle. 100mL.
5.4 Pipette. 1mL, 2mL, 5mL, 10mL, 15mL and 25mL.
5.5 cold water bath. the temperature can be controlled between 15 ℃ ~ 25 ℃.
5.6 boiling water bath.
GB/T 22427.11-2008/ISO 3946. 1982
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