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GB 28653-2012: [GB/T 28653-2012] Ammonium fluoride for industrial use
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[GB/T 28653-2012] Ammonium fluoride for industrial use
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Basic data | Standard ID | GB 28653-2012 (GB28653-2012) | | Description (Translated English) | [GB/T 28653-2012] Ammonium fluoride for industrial use | | Sector / Industry | National Standard | | Classification of Chinese Standard | G12 | | Classification of International Standard | 71.060.50 | | Word Count Estimation | 9,970 | | Quoted Standard | GB 190-2009; GB/T 191-2008; GB/T 6678; GB/T 6682-2008; GB/T 8170; HG/T 3696.1; HG/T 3696.2; HG/T 3696.3 | | 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 Chinese standard specifies the requirements of industrial ammonium fluoride, test methods, inspection rules, marking, labeling, packaging, transportation, storage, and security. This standard applies primarily as glass etching agent, metal surface ch | GB 28653-2012: [GB/T 28653-2012] Ammonium fluoride for industrial use---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.
Ammonium fluoride for industrial use
ICS 71.060.50
G12
National Standards of People's Republic of China
Industrial ammonium fluoride
Published 2012-09-03
2013-06-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China issued
Foreword
This standard Chapter 7, Chapter 8 and Chapter 9 8.1,8.3,8.4 content is mandatory, the rest are recommended.
This standard was drafted in accordance with rules GB/T 1.1-2009 given.
The standard proposed by China Petroleum and Chemical Industry Federation.
This standard by the National Standardization Technical Committee chemical inorganic chemicals branch (SAC/TC63/SC1).
This standard was drafted. Foshan City of Quality Supervision and Testing Center, Fujian Shao Wu City Wing Chemical Co., Ltd., Zhejiang three US Chemical
Co., Ltd., Zhejiang fluorescent Chemical Co., Ltd., Shandong-fluoro-New Materials Co., Ltd., CNOOC Tianjin Chemical Research & Design Institute, Zhejiang Province
Institute of Chemical Industry Co., Ltd Fluoride Chemicals Co., Ltd., Zhejiang Ying Peng Chemical Co., Ltd.
The main drafters. Zhang Zhaozhi, Guo Fengxin, Wan group level, Xu Yihong, He Zhengping, Zhou Pengpeng THE CHEMICAL Xue Xu Jin, Xie flood friends.
Industrial ammonium fluoride
Warning. to use this standard shall have practical experience in regular laboratory work. This standard does not indicate that all possible security issues.
The user's responsibility to take appropriate safety and health practices and to ensure compliance with the conditions of the relevant state regulations.
1 Scope
This standard specifies the requirements of industrial ammonium fluoride, test methods, inspection rules, signs, labels, packaging, transportation, storage, and security.
This standard applies primarily as industrial ammonium fluoride glass etchant, the metal surface of the chemical polishing or the like.
2 Normative references
The following documents for the application of this document is essential. For dated references, only applies to the version dated paper
Pieces. For undated references, the latest edition (including any amendments) applies to this document.
GB 190-2009 dangerous goods packaging logo
GB/T 191-2008 Packaging Pictorial signs
GB/T 6678 General Principles for Sampling Chemical Products
GB/T 6682-2008 specifications and test methods for water analysis laboratory
GB/T 8170 rounding off means about rules and determining limiting values
HG/T 3696.1 inorganic chemical analysis of the product by standard chemical solution, Preparations Part 1. standard titration
Preparation of the solution
HG/T 3696.2 Inorganic chemicals for chemical analysis of standard solution, the second portion of Preparations. Standard impurities
Preparation of the solution
HG/T 3696.3 Inorganic chemicals Chemical analysis of standard solution, Preparations Part 3. Formulation and preparation
Preparation products
Molecular formula and molecular weight 3
Molecular formula. NH4F
Molecular weight. 37.04 (according to 2007 international relative atomic mass)
4 Requirements
4.1 Appearance. white crystal.
4.2 Industrial ammonium fluoride according to the present standard test methods specified in Table 1 should detect the technical requirements.
Table 1 Technical Requirements
project
index
First grade Qualified
Ammonium fluoride w /% ≥ 95.0 93.0
The free acid (in terms of HF) w /% ≤ 1.0 1.0
Fluorosilicate [In (NH4) 2SiF6 count] w /% ≤ 0.5 1.0
5 Test methods
5.1 Safety Tips
Ammonium fluoride this test method the samples taken toxic, deliquescent and strongly acidic aqueous solution in the air, part of the test used
Also corrosive agent, an operator should be careful to avoid contact with the skin; the skin, such as contact immediately wash with water, shall immediately severe
Medical treatment.
5.2 General Provisions
This standard reagent and water, in the absence of other requirements specified, are by analytical reagent and GB/T 6682-2008 specified
Tertiary water used in the test standard titration solution, impurity standard solution, formulations and products, in the absence of other requirements specified, are by
HG/T 3696.1, HG/T 3696.2, preparing a predetermined HG/T 3696.3 is.
5.3 Visual inspection
In natural light, white plastic plate is placed is determined by visual appearance.
5.4 Determination of the content of ammonium fluoride
5.4.1 Method summary
Samples dissolved in water, adding ammonium ions react with formaldehyde, hexamethylenetetramine generate and release an acid to phenolphthalein as an indicator, with sodium hydroxide
Standard Solution titration, subtracting the result of free acids and fluoro-silicate content, obtain the content of ammonium fluoride.
5.4.2 Reagents
5.4.2.1 neutral formalin solution. 11. Mixed formaldehyde and other volumes of water, add 2 drops of phenolphthalein indicator, titrate with standard sodium hydroxide solution
Titrated to a pale pink.
5.4.2.2 sodium hydroxide standard titration solution. c (NaOH) ≈0.5mol/L.
5.4.2.3 phenolphthalein indicator solution. 10g/L.
5.4.3 Analysis of step
Weigh about 0.5g sample, accurate to 0.0002g, placed in a plastic cup, add 20mL water soluble, neutral formalin solution was added 40mL shake
Uniform, placed 30min. Add 2 drops of phenolphthalein indicator solution, the solution was pink titrated with standard sodium hydroxide solution was titrated to, and does not fade holding 30s
Color is the end.
5.4.4 calculation results
Ammonium fluoride ammonium fluoride content (of NH4F) w1 mass fraction basis, calculated according to formula (1).
w1 =
(V/1000) cM
m × 100% -1.851w2-0.4158w3
(1)
Where.
Sodium hydroxide standard titration solution volume V --- titration test solution consumed value in milliliters (mL);
Accurate value of the concentration of the solution of sodium hydroxide standard titration --- C, in units of moles per liter (mol/L);
Value m --- mass of the sample in grams (G);
--- numerical molar mass M ammonium fluoride (NH4F), in units of grams per mole (g/mol) (M = 37.04);
--- value w2 of the free acid content of 5.5 determined;
W3 --- fluoro silicate content by determination of the value 5.6;
--- 1.851 in terms of coefficient of hydrogen fluoride ammonium fluoride;
0.4158 --- ammonium fluorosilicate factor in terms of ammonium fluoride.
Parallel to the arithmetic average of the measurement results of the measurement result, the absolute difference determination results parallel to not more than 0.3%.
Determination of free acid content of 5.5
5.5.1 Method summary
Samples were dissolved in water, Bromocresol purple as an indicator, titrated titrated with standard sodium hydroxide solution.
5.5.2 instruments and equipment
Microburette. reference value 0.02mL.
5.5.3 Reagents and materials
5.5.3.1 sodium hydroxide standard titration solution. c (NaOH) ≈0.1mol/L.
5.5.3.2 bromocresol purple indicator solution. 1g/L. Weigh 0.10g bromocresol purple, was dissolved in ethanol 100mL95%.
5.5.3.3 carbon dioxide-free water.
5.5.4 Analysis of step
Weigh about 1g sample, accurate to 0.001 g of, placed in a plastic cup, add 50mL water without carbon dioxide dissolved, 2 drops of bromocresol
Purple indicator solution, titration with a sodium hydroxide standard solution was titrated to the end point of the solution was purple.
5.5.5 calculation results
The free acid content of hydrogen fluoride (HF) w2 mass fraction basis, calculated according to formula (2).
w2 =
(V/1000) cM
m × 100%
(2)
Where.
Sodium hydroxide standard titration solution volume V --- titration test solution consumed value in milliliters (mL);
Accurate value of the concentration of the solution of sodium hydroxide standard titration --- C, in units of moles per liter (mol/L);
Value m --- mass of the sample in grams (G);
--- numerical molar mass M hydrogen fluoride (HF), in units of grams per mole (g/mol) (M = 20.01).
Parallel to the arithmetic average of the measurement results of the measurement result, the absolute difference determination results parallel not greater than 0.15%.
5.6 Determination of the content of fluorosilicate
5.6.1 Method summary
Sample was dissolved in water, adding boric acid to eliminate interference with fluoride ions complexed fluorine. Quantitative reaction with ammonium molybdate added silicic acid, silicon-molybdenum generated
Heteropolyacids (Si - Mo), in the presence of oxalic acid was added stannous chloride reduction of the Si - Mo is molybdenum blue silicon count measured by a spectrophotometer.
5.6.2 Reagents
5.6.2.1 boric acid. 40g/L.
5.6.2.2 sulfuric acid solution. 134.
5.6.2.3 ammonium molybdate solution. 100g/L.
5.6.2.4 oxalic acid solution. 50g/L.
5.6.2.5 stannous chloride hydrochloric acid solution. 20g/L.
5.6.2.6 silica standard solution. 1mL solution containing silicon dioxide (SiO2) 0.02mg. Pipette by pipetting 2mL
HG/T 3696.2 standard solution prepared silica, a 100mL volumetric flask, diluted with water to the mark. The solution was active
Existing service.
5.6.2.7 saturated 2,4-dinitrophenol indicator solution.
5.6.3 instruments and equipment
UV-visible spectrophotometer. with a 1cm cuvette.
5.6.4 Analysis of step
5.6.4.1 Preparation of test solution
Weigh about 1g sample, accurate to 0.01g, placed in a plastic beaker, adding a boric acid solution 40mL for sample dissolution. Transferred to 100mL
Volumetric flask, diluted with water to the mark.
Draw standard curve 5.6.4.2
Pipette with a pipette 0.00mL, 0.50mL, 1.00mL, 2.00mL, 3.00mL, 4.00mL, 5.00mL standard silica
Solution, were placed in a 50mL volumetric flask, add 2 drops of saturated 2,4-dinitrophenol indicator solution, sulfuric acid solution was added dropwise to the solution just eliminate yellow
Loss, diluted to 10mL, 4.5mL was added a solution of sulfuric acid. Ammonium molybdate solution was added 2mL placed 20min. 5mL was added oxalic acid solution,
Placed 5min. Add 0.2mL of stannous chloride hydrochloric acid solution, shake. Diluted with water to the mark. UV visible spectrophotometer, the
At 795nm wavelength using a 1cm cuvette, zero water absorbance thereof was measured.
Reagent blank absorbance was subtracted from the absorbance of each standard solution, the silica mass (mg) as abscissa, the corresponding
Absorbance as the ordinate, drawing working curve.
5.6.4.3 Determination
Pipette a quantity of pipette with a test solution (first-class goods take 5mL, take-defective 2 mL), was placed in a 50mL volumetric flask, according to the following
5.6.4.2 From the "plus 2 drops of a saturated solution of 2,4-dinitrophenol indicating" start to "measured absorbance" far. Blank test is to take
An amount of boric acid solution (4 mL sample Take First, 0.8 mL of take-defective), a 50mL volumetric flask, and the same test solution at the same time
Sample processing. Isolated test solution and the blank test solution from the mass of silica in the working curve.
5.6.5 calculation results
Fluorosilicate, ammonium fluorosilicate content [(NH4) 2SiF6] w3 terms of mass fraction, (3) is calculated according to the formula.
w3 =
(M1-m0) × 10-3 × 2.965
m (V/100) × 100%
(3)
Where.
--- value M1 obtained from the working curve of the test solution to check the quality of the silica, in milligrams (mg);
--- value M0 from the working curve of the blank test solution Richard silica mass, in milligrams (mg);
Value m --- mass of the sample in grams (G);
Numerical solution of the test volume during pipetting V --- test, in milliliters (mL);
2.965 --- factor in terms of silica of ammonium fluorosilicate.
Parallel to the arithmetic average of the measurement results of the measurement result, the absolute difference determination results parallel to 0.02%.
6 Inspection Rules
All items specified in 6.1 standard factory inspection items should be tested batches.
6.2 the same material, substantially same production conditions, continuous production of the same team or ammonium fluoride industrial production batch. Each batch of products is not
More than 10t.
Unit 6.3 determines the number of samples by GB/T 6678 a predetermined sampling technique. Sampling the hard plastic tube sampler pouch obliquely from above
Inserted into the layers of 3/4 of sampling depth. The sample was placed in a sealed collection container, mixing, reduced to less than 500g, dispensed into two
Clean dry plastic vial, sealed. Attach a label on the bottle, indicating manufacturer name, product name, grade, batch number, date of sampling and sampling by surname
name. As a laboratory sample bottle, the other bottle stored for future reference, save time determined by the manufacturer according to the actual situation.
6.4 If the test results do not meet the requirements of this standard indicators, should be re-double the amount of self-packaging sampling retest, retest results even
Only when an indicator does not meet the requirements of this standard, the entire batch of product is substandard.
6.5 according to GB/T 8170 rounding predetermined value comparison determination whether or not the test results standard.
7 signs, labels
7.1 Industrial ammonium fluoride should be a clear sign of the packaging firm, including. manufacturer's name and address, product name, grade, net weight, lot number
(Or date of manufacture), and the standard number "toxic substances" GB 190-2009 predetermined tags, GB/T 191-2008 predetermined "fear
Sun "," afraid of the rain "logo.
7.2 Each batch of industrial ammonium fluoride factory should be accompanied by a certificate of quality. They include. manufacturer's name and address, product name, grade, containing a net
Quantity, batch number (or date of manufacture) and the standard number.
8 packaging, transportation, storage
8.1 packaging industry uses a two ammonium fluoride. Polyethylene plastic film packaging bags; outer plastic bags. Inside the bag with Pooh
Long cord or other cord of comparable quality artificial Zhakou four, or by other means equivalent thereto seal; suture packaging firm, not leaky
And jumper phenomenon.
8.2 Industrial ammonium fluoride net weight 10kg, 20kg or 25kg.
8.3 Ammonium fluoride during the transportation industry should be covered to prevent the sun, rain, moisture; not with acid, alkali mixed operation.
8.4 Industrial ammonium fluoride should be stored in a cool, ventilated dangerous for these warehouses, to prevent the sun, rain, moisture; not with acid, alkali mixed storage.
9 Security
9.1 ammonium fluoride in the air easily deliquescence, easily soluble in water, acidic aqueous solution. Case acid decomposition emit corrosive hydrogen fluoride, in case there is a base release
Irritating ammonia, Thermal decomposition of ammonia and hydrogen fluoride gas. Production process should be closed operation, enhance ventilation. Workplace should be equipped with safety shower
Bath and eyewash equipment.
9.2 ammonium fluoride on the skin and mucous membrane irritant. Contact with the skin can produce burns, inhalation of respiratory tract irritation. The operator should be equipped
Wear safety glasses, wear protective overalls and protective gloves. Emergency rescue or evacuation, should wear protective masks or self-contained filter type
Air breathing apparatus.
9.3 ammonium fluoride should be loaded and unloaded lightly handling, packaging and to prevent breakage of the container. To avoid dust, should not be in contact with an acid, a base.
9.4 ammonium fluoride not in direct contact with the skin. If you come into contact with skin, wash immediately with plenty of water, severe cases should seek medical care immediately.
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