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GB 5175-2008: Food additive -- Sodium hydroxide
Status: Obsolete GB 5175: Evolution and historical versions
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Food additive -- Sodium hydroxide
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| GB 5175-2000 | English | 359 |
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PDF similar to GB 5175-2008
Basic data | Standard ID | GB 5175-2008 (GB5175-2008) | | Description (Translated English) | Food additive -- Sodium hydroxide | | Sector / Industry | National Standard | | Classification of Chinese Standard | X42 | | Classification of International Standard | 67.220.20 | | Word Count Estimation | 9,928 | | Date of Issue | 2008-06-25 | | Date of Implementation | 2009-01-01 | | Older Standard (superseded by this standard) | GB 5175-2000 | | Quoted Standard | GB 190-1990; GB/T 191-2008; GB/T 534-2002; GB/T 6678; GB/T 6682-2008; GB/T 5009.74-2003; GB/T 5009.76-2003; HG/T 3696.1; HG/T 3696.2; HG.T 3696.3 | | Adopted Standard | FCC (V)-2004, NEQ | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 12 of 2008 (No. 125 overall) | | 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 Chinese standard specifies the requirements for food additives, sodium hydroxide, test methods, inspection rules, marking, labeling, packaging, transportation and storage. This standard applies to food additives sodium hydroxide. The products in the food industry as acidity regulator and food industry processing aids. | GB 5175-2008: Food additive -- Sodium hydroxide---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.
Food additive.Sodium hydroxide
ICS 67.220.20
X42
National Standards of People's Republic of China
Replacing GB 5175-2000
Food additive sodium hydroxide
Posted 2008-06-25
2009-01-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
Chapter 4 of this standard, Chapters 7 and 9 are mandatory, others are recommended.
This standard with the US Food Chemicals Codex [FCC (V).2004] "sodium" in non-equivalent.
This standard replaces GB 5175-2000 "food additive sodium."
The main differences between this standard and GB 5175-2000 are as follows.
--- "Requirements" to increase the "look and feel" content (edition 4.1);
--- Total Alkalinity food additive solid sodium hydroxide by "95.0% ~ 100.5%" with "98.0% and 100.5%" in (2000 edition
Chapter 3; edition 4.2);
--- Total Alkalinity food additive liquid sodium by "97.0% -103.0%" to "98.0% -103.0%" year (2000 edition
Chapter 3; edition 4.3);
--- Food Additives solid sodium hydroxide and sodium hydroxide liquid sodium levels ranging from "not more than 3.0%" to "2.0%" (2000
Chapter 3 edition; edition 4.2, 4.3);
--- Food Additives solid sodium hydroxide and sodium hydroxide liquid heavy metal content in the "0.002%" to "0.0005%" (2000
Chapter 3 edition; edition 4.2);
--- Deletion of food additives and food additives of solid sodium hydroxide liquid lead content requirements (3rd edition, 2000
Chapter; edition 4.2, 4.3);
--- Mercury content of the food additive liquid sodium by "0.0001%" with "0.00001%" (2000 edition Chapter 3; this
Version 4.3);
--- Determination of total alkali content in the "methyl orange indicator solution" use "Bromocresol green - methyl red indicator solution" (2000 Version 4.2; 5.5 edition).
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee chemical inorganic chemicals Club (SAC/TC63/SC1) and the National Food Additives Standardization
Technical Committee (SAC/TC11) common focal point.
Drafting of this standard. Qingdao Haijing Chemical Group Co., Ltd., Sichuan Zigong Honghe Chemical Corporation, located in Tianjin Chemical Research
Design Institute.
The main drafters. Zhang Yingmin, Cao Yong, Wang Yan.
The standard standard replaces the previous editions.
--- GB 5175-1985, GB 5175-2000.
Food additive sodium hydroxide
1 Scope
This standard specifies requirements for a food additive sodium hydroxide, test methods, inspection rules, marking, labeling, packaging, transportation and storage.
This standard applies to food additive sodium hydroxide. The products in the food industry as acidity regulator and the food processing industry
Additives.
2 Normative reference standard
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.
GB 190-1990 dangerous goods packaging logo
GB/T 191-2008 Packaging - Pictorial signs (ISO 780.1997, MOD)
GB/T 534-2002 industrial sulfuric acid
GB/T 6678 General Principles for Sampling Chemical Products
GB/T 6682-2008 analytical laboratory use specifications and test methods (ISO 3696. 1987, MOD)
GB/T 5009.74-2003 limit test of heavy metals in food additives
Determination of GB/T 5009.76-2003 arsenic in food additives
Preparation of standard titration solution of HG/T 3696.1 inorganic chemical products, chemical analysis
Preparation of HG/T 3696.2 inorganic chemical products, chemical analysis of impurity standard solution
Preparations of HG/T 3696.3 inorganic chemical products, chemical analysis
3 formula and relative molecular mass
Molecular formula. NaOH
Molecular Weight. 40.00 (according to 2007 international relative atomic mass)
4 Requirements
4.1 Appearance.
4.1.1 Food Additives solid sodium hydroxide as a white or nearly white.
4.1.2 Food Additives liquid sodium hydroxide is clear or slightly turbid, colorless liquid or pinkish color.
4.2 Food Additives solid sodium hydroxide shall comply with the requirements in Table 1.
Table 1 Requirements
Item Index
Total Alkalinity (NaOH in dollars),/98.0 to 100.5%
Sodium carbonate (Na2CO3), /% ≤ 2.0
Arsenic (As), /% ≤ 0.0003
Heavy metals (Pb), /% ≤ 0.0005
Insolubles and organic impurities by test
Mercury (Hg), /% ≤ 0.00001
4.3 Food additives shall comply with Table 2 liquid sodium requirements.
Table 2 Requirements
Item Index
Total Alkalinity (NaOH in dollars) (indicated by the value of the conversion of sodium hydroxide),/98.0 to 103.5%
Sodium carbonate (Na2CO3) (indicated by the value of the conversion of sodium hydroxide), /% ≤ 2.0
Arsenic (As), /% ≤ 0.0003
Heavy metals (Pb), /% ≤ 0.0005
Insolubles and organic impurities by test
Mercury (Hg), /% ≤ 0.00001
5 Test methods
5.1 Safety Tips
This product is a strong base and strong acid used in the tests as corrosive, the operation should be careful. As splashed on the skin immediately with plenty of
Water.
5.2 General Provisions
This standard reagents and water, did not indicate when the other requirements, refer to analytically pure reagents and GB/T 6682-2008 specified three
Grade water.
Standard solution, standard solution impurities, formulations and product tests required in the absence of other requirements specified according to HG/T 3696.1,
HG/T 3696.2, the provisions prepared HG/T 3696.3 of.
5.3 appearance of discrimination
In natural light, visually distinguish samples taken.
5.4 Identification Test
5.4.1 The product solution can dissociate OH-, strongly alkaline reaction.
5.4.2 Identification of sodium ions.
5.4.2.1 instruments and equipment
Top firing platinum wire glass rod.
5.4.2.2 Procedure
With a clean platinum wire wetted with hydrochloric acid in the combustion flame to colorless; dipped into the sample combustion in a colorless flame, the flame that was bright
yellow.
5.5 Determination of total alkali content and sodium content
5.5.1 Method summary
Total Alkalinity. sample solution Bromocresol green - methyl red as indicator solution, titration with hydrochloric acid standard solution titration to the end point, in accordance with standard hydrochloric acid drop
Consumption of fixed total alkali content of the solution is determined.
Content of sodium carbonate. barium chloride in the sample solution, the precipitate of sodium carbonate into barium carbonate; sodium hydroxide solution using phenolphthalein as
Indicator solution, titration with hydrochloric acid standard solution titration to the end point, measured sodium content. Minus the sodium content by total alkali content can be obtained
Sodium carbonate content.
5.5.2 Reagents and materials
5.5.2.1 barium chloride solution. 100g/L;
Before using phenolphthalein as an indicator solution, adjusted with sodium hydroxide solution pink.
5.5.2.2 hydrochloric acid standard titration solution. Ba (HCl) about 1mol/L;
5.5.2.3 phenolphthalein indicator solution. 10g/L;
5.5.2.4 Bromocresol green - methyl red indicator solution. 1g/L.
5.5.3 Analysis of step
5.5.3.1 Preparation of test solution
With known mass weighing bottle, quickly weighed solid sodium hydroxide (38 ± 1) g or liquid sodium hydroxide (50 ± 1) g, accurate to 0.01g,
Add 400mL polyethylene beaker, dissolved in water. After cooling to room temperature, transferred to a plastic stopper 1000mL volumetric flask, diluted with water
To the mark, shake, and the solution was placed in a clean, dry polyethylene plastic bottle. This is a test solution A.
5.5.3.2 Determination
Pipette Pipette 50mL test solution A, injection 250mL Erlenmeyer flask, add 2-3 drops of bromocresol green - methyl red indicator solution,
In a magnetic stirrer, titration with hydrochloric acid standard solution titration to a closed solution from green to dark red, boiling 2min, cooled successor
Continued titrated to a solution and then dark red.
Another pipette pipette 50mL test solution A, injected into 250mL Erlenmeyer flask, was added 20mL barium chloride solution, then added to 2
3 drops of phenolphthalein indicator solution, under magnetic stirrer, titration with hydrochloric acid standard solution titration until the solution was confined to a pink endpoint.
5.5.4 Calculation Results
5.5.4.1 a total base amount of sodium hydroxide (NaOH) mass fraction of 1 meter, expressed in%, according to equation (1).
1 = Vp 1 Ba M1
× 100 (1)
5.5.4.2 sodium content of sodium carbonate (Na2CO3) mass fraction 2 and its value is expressed in%, according to equation (2).
2 =
(Vp Vp 1- 2) Ba M2/1000
× 100 (2)
Where.
As the number of methyl red indicator solution, sodium hydroxide standard titration test solution titration solution consumed volume - Vp 1 --- Bromocresol green
Value in milliliters (mL of);
Vp 2 --- phenolphthalein as an indicator solution, titration test solution value volume consumed sodium hydroxide standard titration solution, expressed in cents
L (mL of);
Accurate Ba --- sodium hydroxide standard titration solution concentration value in units of moles per liter (mol/L);
Numerical M1 --- sodium hydroxide (NaOH) molar mass in grams per mole (g/mol) (M = 40.00);
The molar mass values of the M2 3 --- sodium carbonate 12Na2CO (), in units of grams per mole (g/mol) (M = 52.99).
5.5.4.3 with respect to the total alkali content (as NaOH meter) mass fraction of liquid sodium hydroxide indicated representing the value of the mass fraction of 3
And its value is expressed in%, according to equation (3) Calculated.
Chou = 1 3 × 100
(3)
5.5.4.4 with respect to sodium hydroxide liquid mass fraction indicated representing the value of sodium carbonate (Na2CO3) mass fraction of 4 meters,
Values expressed in%, according to equation (4) Calculated.
4 = 2 × 100 Chou
(4)
Where.
Chou --- liquid sodium concentration indicated value.
Take the arithmetic mean of the parallel determination results of the measurement results, the measurement results of two parallel mass fraction of sodium hydroxide is absolutely no difference
Greater than. 0.2%; absolute difference between the results of two parallel determination of sodium content of not more than. 0.1%.
5.6 Determination of Arsenic
Weigh (10.00 ± 0.01) g sample of solid sodium hydroxide or equivalent (10.00 ± 0.01) g (measured in quality of liquid sodium hydroxide
Fractional conversion) samples of solid sodium hydroxide liquid sample, add water about to dissolve or dilute 20mL. Was slowly added dropwise a solution of hydrochloric acid (1 + 1) and
To neutral (pH paper with instructions). After cooling to room temperature, transferred to 100mL volumetric flask, dilute to the mark, shake (if necessary dry filter, discard
First filtrate). This is a test solution B, alternate.
Pipette Pipette 10mL test solution B, placed in a given arsenic bottle, the following press GB/T 5009.76-2003 Gutzeit method
Determination.
Pipette Pipette 3mL arsenic standard solution (1mL solution containing 1μg arsenic) as a standard, the following according to GB/T 5009.76-2003
Gutzeit method was measured.
5.7 Determination of Heavy Metal Content
Pipette Pipette 20mL test solution B in 50mL colorimetric tube, add 1 drop of phenolphthalein indicator solution, aqueous ammonia solution (1 + 1) transfer
To pink, the following according to GB/T 5009.74-2003 Chapter 6 were measured.
Pipette Pipette 10mL lead standard solution (1mL solution containing 1μg lead) as a standard, the following according to GB/T 5009.74-2003
Chapter 6 is measured.
5.8 Determination of insoluble matter and organic impurities
Weigh (5.00 ± 0.01) g solid sodium hydroxide dissolved in 100mL of water. This solution is completely clear, colorless or slightly with
Colour.
5.9 Determination of mercury content
5.9.1 Method summary
With GB/T 534-2002 in 5.6.2.1.
5.9.2 Reagents
5.9.2.1 sulfuric acid solution. 1 + 1; other reagents with GB/T 534-2002 in 5.6.2.2.
5.9.3 instruments and equipment
With GB/T 534-2002 in 5.6.2.3.
5.9.4 Analysis of step
5.9.4.1 Preparation of test solution
Weighing (2.00 ± 0.01) g solid sodium hydroxide or equivalent (2.00 ± 0.01) g solid sodium hydroxide liquid sample placed
100mL beaker, dissolved in 20mL water, 10mL sulfuric acid was added dropwise a solution of (5.9.2.1), was added 0.5mL potassium permanganate solution, this
Surface of the glass beaker was covered and boiled for a few seconds, and then cooled.
5.9.4.2 Preparation of the blank test solution
But without addition of the sample, the test solution at the same time with the same treatment.
5.9.4.3 Draw the curve
According to GB/T 534-2002 in 5.6.2.4.2, selecting the mercury content of the standard curve 0μg ~ 1μg.
5.9.4.4 Determination of the sample solution and the blank solution
According to GB/T 534-2002 5.6.2.4.3 and 5.6.2.4.4 of the operation.
5.9.5 Calculation Results
According to GB/T 534-2002 in 5.6.2.5 and 5.6.2.6.
5.9.6 Processing of mercury-containing waste
The mercury-containing waste collected in containers of about 50L, 40L about the time when the waste followed by adding 400g/L sodium hydroxide solution 400mL,
100g sodium sulfide (Na2S · 9H2O), shake. Slowly added 10min after mass fraction of 30% hydrogen peroxide solution 400mL, mixed well
Together, place 24h after the upper part of the wastewater discharged into the supernatant, the precipitate was transferred to another vessel, the mercury were recovered by hand.
6 Inspection rules
6.1 uses standard type test and factory inspection.
6.1.1 The standards for all indicators project type inspection items. Under normal circumstances, at least once per month, type test. The following
When one case, the type of inspection should be carried out.
a) Replace the key production process;
b) The main raw material change;
c) to resume production after a shutdown;
d) factory inspection results are quite different and the last type test.
6.1.2 This standard specifies the project total alkali content, sodium, arsenic, heavy metals, organic impurities and insolubles factory inspection items should batch
test.
6.2 Manufacturer of the same material, the same basic production conditions, continuous production or the same team for the production of food additive sodium hydroxide
, Each batch of products folded into the solid base of no more than 300t.
6.3 Food Additives solid sodium hydroxide to determine the number of sampling units according to the provisions of GB/T 6678's. Sampling, the sampler is inserted to slow
Two-thirds of the sample container depth. The samples were collected was mixed, the total amount of not less than 500g, packed in a clean, dry plastic bag or two
Stoppered plastic bottle, sealed.
When a food additive sodium hydroxide liquid tank or sump shipment from the upper, middle and lower three one-tenth of the liquid layer (upper level from the lower
One-tenth of the liquid from the bottom of the liquid layer) remove an equal amount of sample, mix, the total sample volume of not less than 500mL, placed in sealed plastic bottle.
Stick labels on plastic bottles indicate. manufacturer's name, product name, lot number or tankers, sampling and sampling date's name. Bottle for
Test, another bottle for three months to save for future reference.
6.4 Food additive sodium hydroxide by the manufacturer's quality supervision and inspection departments inspected in accordance with the requirements of this standard, the manufacturer shall ensure that
Each batch of products meet the requirements of this standard.
6.5 If the test results do not meet the requirements of this standard indicators, should be twice the amount of packaging from re-sampling reinspection, the reinspection results even if only
An indicator does not meet the requirements of this standard, then the entire batch of products to be ineligible.
7 signs, labels
7.1 Food additives should be on a solid sodium hydroxide containers clearly labeled, including. manufacturer's name and address, product name, "food
Additives "words, net weight, lot number or production date, license number of hazardous chemicals, health permit number and serial number of this standard, as well as
GB 190-1990 specified in "corrosive" logo, GB/T 191-2008 specified in the "up" and "fear wet" signs, safety labels.
7.2 each batch of food additive sodium hydroxide should be accompanied by a certificate of quality, including. manufacturer's name and address, product name, net containing
Amount, lot number or production date, product quality and compliance with this standard proved that the standard number, license number of hazardous chemicals, health permit number to
Safety and technical specifications and safety labels.
8 packaging, transportation, storage
8.1 Food additives used iron solid sodium hydroxide or other airtight containers, containers shall comply with the relevant provisions. Lid should be sealed
firm. Net weight per barrel 200kg.
Food additive liquid sodium hydroxide or sump tank car shipments, and regular cleaning.
Allows the use of standard food packaging plastic barrels, tanker shipment of food additive sodium hydroxide flakes or liquid sodium hydroxide.
8.2 Food additives shall sodium hydroxide with acid and toxic and hazardous materials transportation mix and prevent impact during transport.
8.3 Food additive sodium hydroxide should be stored in a cool dry place, avoid breakage, contamination, moisture and contact with acids.
8.4 Food additive sodium shelf life of 1 year overdue inspection, can continue to use.
9 Security
When sodium hydroxide is highly corrosive, possible exposure to dust, should wear headgear electric powered air-purifying respirators and dust. when necessary,
Air respirators to wear. Wear rubber acid suit. Wear rubber gloves acid. Workplace smoking, eating and drinking, to wash before meals
hand. After work, take a shower.
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