HG/T 3013-1999 Specification for Boric Acid Granules for Photographic Processing Chemicals
Some standard content:
Record number: 3746--1999
HG/T30131999
This standard is equivalent to the revision of the international standard ISO3628:1994 & the photography industry standard HG/T30131989 photographic grade
boric acid.
- Specification for Boric Acid for Processing Chemicals" has been revised in terms of technical requirements, test methods, and writing style compared to IIG/T3013-1989. From the date of implementation, this standard will replace HG/T3013-1989. This standard was proposed by the Technical Supervision Department of the former Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Photosensitive Materials Standardization Technical Committee. The drafting unit of this standard: Photosensitive Materials Technology Development Center of the Ministry of Chemical Industry. The main drafter of this standard: Ding Peiling.
This standard is entrusted to the National Photosensitive Materials Standardization Technical Committee for interpretation. Introduction
ISO Background
ISO (International Organization for the Promotion of Standards) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing international standards is carried out by ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee, and international organizations, governmental or non-governmental, may also participate in the work by contacting ISO. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standards. Draft international standards established by technical committees are circulated to the member bodies for voting, and publication requires a vote by at least 75% of the member bodies voting. International Standard ISO 3628 was prepared by Technical Committee ISO/TC 42, Photography. This edition cancels and replaces the first edition of ISO 3628:1976, which was technically revised. ISO Citation
0.1 This International Standard is one of a series of standards that establish purity standards for chemicals used in processing photographic materials. The general test methods and procedures used in this International Standard are taken from parts 1, 4 and 5 of ISO 10349. This International Standard is intended for use by persons with some knowledge of chemical analysis techniques, but this may not be the case. Some of the test steps use corrosive, toxic or other hazardous chemicals. When handling such chemicals safely in the laboratory, safety glasses or sun goggles, rubber gloves and other protective equipment, such as appropriate masks or work clothes, are required. Whenever chemical test operations are carried out, routine protective measures should be taken to provide warnings for various hazardous materials. Hazard warnings marked with letters in angle brackets <) are used to indicate the details of certain steps. These are specified in ISO 10349-1. More detailed information on the hazards, handling and use of such chemicals is provided by their manufacturers.
0.2 This International Standard sets out the chemical and physical requirements applicable to photographic grade chemicals. These tests are closely related to the quality of photographic results. Purity requirements can be set lower on the basis of ensuring photographic results. This standard is the minimum requirement that must be met to ensure the purity of the chemical used in photographic processing solutions. Unless the grade of chemical available on the market is purer than the photographic processing requirement and the chemical can be used without economic loss, the purity requirement allows the use of high quality materials. Every effort should be made to minimize the number of requirements and to limit the level of inert impurities to a level that does not unduly affect the test. All tests are to be carried out on "as-delivered" samples in order to give a true reflection of the material as supplied for use. Although the ultimate criterion for the acceptance of a chemical is that the product passes the appropriate application tests, the use of the brief and economical test methods described in this International Standard is generally suitable. Where the inspection program includes all available satisfactory methods, an effective test requirement not only serves as a measure of chemical purity but also provides a valuable supplement to the qualitative tests. Whenever other chemicals or mixtures of chemicals pass the other test requirements, the identification test is also passed.
The requirements listed in Chapter 4 are mandatory. The physical appearance of the material and any footnotes are for general reference only and are not part of the standard requirements. 0.3 Efforts should be made to use tests that can be performed in laboratories with standard equipment and to avoid, as far as possible, tests that require highly specialized equipment or techniques. Instrumental analysis methods are specified only as alternative methods or methods that can only be used when no other satisfactory methods are available.
In recent years, great progress has been made in the instrumentation of various chemical analysis methods. As long as these new technologies have equal or higher precision, they can replace the test methods used in this International Standard. Users of the standard should study the relationship between the alternative method and the original method. When the test results are different, the method specified in the technical conditions should prevail. In addition, where the technical requirements specify "by test", the alternative method should not be used.
1 Scope
Chemical Industry Standard of the People's Republic of China
Photography Processing Chemicals
Specifications for boric acid, granular
Photography Processing chenicalsSpecifications for boric acid, granularThis standard specifies the requirements and test methods for boric acid in photography processing chemicals. 2 Referenced Standards
HG/T3013—1999
idtIS03628:1994(F)
Replaces HG/T 3013-1989
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T601-1988 Preparation of standard solutions for titration analysis of chemical reagents (volume analysis) GB/T619·1988 Rules for sampling and acceptance of chemical reagents HG/T2632-1994 General test methods for photographic grade chemicals (idtISO10349:1992) 3 Basic properties
3. 1 Physical properties
Boric acid (II, B()a) is a white crystalline powder with a relative molecular mass of 61.83. 3.2 Hazards
3. 2. 1 It is confirmed that the acid is not hazardous under normal protection. Please refer to the manufacturer for more detailed information. 3.2.2 Some of the chemicals used in the test methods specified in the subsequent parts of this standard are corrosive, toxic or other hazardous. Safe handling of these chemicals in the laboratory requires wearing protective glasses, rubber gloves and other protective equipment, such as masks or suitable protective clothing. This standard provides hazard warnings for particularly hazardous substances in the test methods and notes, but conventional protective measures should be taken at all times when performing any chemical operations.
The test methods specified in the subsequent parts of this standard give warnings for hazardous substances. The hazard is indicated by the word "danger". There is a single angle bracket "《>" after the word "danger". There is an English letter in the "<)", which indicates the type of hazard. The double angle bracket "《 》" is used to indicate special hazardous situations. The test method only gives a hazard symbol consisting of brackets and an English letter, and the hazard symbol is only given once in the paragraph.
The hazard symbols specified in this standard only provide information to users and do not represent formal hazard labeling requirements, because the requirements in this regard vary from country to country.
3.2.3 Hazard symbols
(B) Harmful if inhaled. Avoid inhaling dust, steam or gas. Use with appropriate ventilation. (C》Harmful if contacted. Avoid contact with eyes, skin or clothing. Wash thoroughly after handling the drug. Approved by the State Administration of Petroleum and Chemical Industry on June 16, 1999 and implemented on June 1, 2000
4 Requirements
The requirements for the product are shown in Table 1.
Content of abrasive acid (H.BO), %
Content of residual ignition, %
Content of heavy metal (Pb), %
Content of iron (Fe), %
Appearance of solution
5 Reagents and glassware
HG/T 3013—1999
Table 1 Limit value
99.0 (mass fraction)
≤: 0.8 (mass fraction)
0.002 (quality inspection score)
0.002 (mass fraction)
Transparent,No insoluble matter, slightly condensed matter is allowed. Related Articles
Standards providing test methods
This standard
Chapter 6 of T2632-1991
Chapter 7 of T2632-1994
Chapter 7 of T2632-1994
This standard
All reagents, materials and glassware, except for those with special notes, shall comply with the provisions of Chapter 3 of IIG/T2632-1994. 6 Sampling
Sampling and acceptance shall be carried out in accordance with the provisions of GB/T 619. 7 Test methods
7.1 Determination of acid content
7.1.1 Requirements
H, BO: content 99.0% (mass fraction). 7.1.2 Reagents and materials
7.1.2.1 Phenolic acid indicator solution.
Dissolve 0.1g phenolic acid in 5ml methanol or ethanol and dilute to 100ml with water. 7.1.2.2 Sodium hydroxide (Na(0)HI) standard titration solution: 1.000 mal/L (40.00g/L)12), without carbonate. 7.1.2.3 Mannitol (C,HO.)
7.1.3 Apparatus and equipment
Burette: 50.00ml.
7.1.4 Operation steps
Weigh 2.4-2.6g of sample (accurate to 0.001g) in a weighing bottle, dissolve it with about 50mL of hot water, add 15g of mannitol to dissolve it, and then add 6 drops of phenolic acid indicator solution. Titrate with sodium hydroxide standard titration solution until it turns light pink, which is the end point. 7.1.5 Calculate
The mass percentage of phenolic acid =
actual concentration of sodium hydroxide standard titration solution, mol/L; volume of sodium hydroxide standard titration solution consumed to reach the titration end point, m; sample mass g:
6.183...conversion factor of boric acid equivalent to 1mol of sodium hydroxide (i.e. 61.83) × conversion factor of mL to L (i.e. 0.001) × 100 (conversion factor of percentage content). Note:
1) It is recommended to use commercially available analytical reagent solutions. For example, if you prepare the standard titration solution yourself, see GB/T601-1988. 2) The solution can be prepared with sodium hydroxide (hazardous: C》). 7.2 Ignition residue
7.2.1 Requirementsbzxz.net
Ignition residue content ≤ 0.3% (mass fraction). 7.2.2 Reagents and materials
7.2.2.1 Methanol.
7.2.2.2 Hydrochloric acid (hazardous: (B》): (1+3)\). HG/T 3013-1999
7.2.2. 3 Sulfuric acid (hazardous: 《C>): p1. 84 g/mL7.2.3 Apparatus and equipment
Platinum crucible: 50mL.
7.2.4 Operation steps
Weigh about 2g of sample (accurate to 0.0001g) in a platinum crucible, add 25mL of methanol and 5 drops of hydrochloric acid, heat to 10 on a steam bath, add 15mL of methanol and 3 drops of hydrochloric acid, evaporate to dryness, then add 2-3 drops of sulfuric acid, heat on a sand bath until the smoke stops evaporating, and burn at (600+50) for 4h according to the provisions of 6.2 of JIG/T2632--1994. 7.3 Determination of heavy metal content
7. 3-1 Requirements
Heavy metal content ≤ 0.002% (mass fraction) 7.3.2 Operation steps
Note: The iron test standard (7. 4) and the heavy metal test standard are consistent. Determine the percentage of heavy metal mass fraction according to HG/T2632--1994, Section 7. Weigh 1.90-2.10g of sample, prepare the sample according to 7.3.1.2 of HG/T2632-1994, and use 4ml heavy metal standard solution according to 7.3.2.2 of HG/T2632-1994 to prepare the impurity standard sample. Due to the limited solubility of acid, use 40ml warm water instead of 25ml water to dissolve 2 samples (see 7.3.1 of HG/T2632-1994), and then dilute to 50ml (see 7.3.3 of IIG/T2632-1994).
7.4 Determination of iron content
7.4.1 Requirements
Iron content ≤ 0.002% (mass fraction). 7.4.2 Operating steps
Determine the iron mass percentage according to Chapter 7 of HG/T2632-1994. Weigh 1.90~2.10g of sample and prepare the sample according to 7.3.1.2 of HG/T2632-1994. Use 4mL of iron standard solution to prepare the impurity standard sample according to 7.3.2.2 of IIG/T2632-1994. Due to the limited solubility of boric acid, use 40mL of warm water instead of 25ml of water to dissolve 2g of sample, and then dilute to 50mL. 7.5 Appearance of solution
7.5.1 Requirements
The solution should be transparent and free of insoluble matter. Slight floccules are allowed. 7.5.2 Operating steps
Dissolve 50g of sample in 1L of water. The solution can be warmed if necessary. The solution is placed at room temperature (20~～27℃) for 30min, and the color of the solution and whether the solution is clear are observed.
3) The solution can be diluted with hydrochloric acid = 1.18g/tnI. (Dangerous: (C)2. Prepare impurity standard samples. Due to the limited solubility of acid, use 40mL of warm water instead of 25mL of water to dissolve 2 samples (see 7.3.1 of HG/T2632-1994), and then dilute to 50mL (see 7.3.3 of IIG/T2632-1994).
7.4 Determination of iron content
7.4.1 Requirements
Iron content ≤ 0.002% (mass fraction). 7.4.2 Operating steps
Determine the iron mass percentage according to Chapter 7 of HG/T2632-1994. Weigh 1.90~2.10g of sample and prepare the sample according to 7.3.1.2 of HG/T2632-1994. Use 4mL of iron standard solution to prepare the impurity standard sample according to 7.3.2.2 of IIG/T2632-1994. Due to the limited solubility of boric acid, use 40mL of warm water instead of 25ml of water to dissolve 2g of sample, and then dilute to 50mL. 7.5 Appearance of solution
7.5.1 Requirements
The solution should be transparent and free of insoluble matter. Slight floccules are allowed. 7.5.2 Operation steps
Dissolve 50g of sample in 1L of water. Warm the solution if necessary. Place the solution at room temperature (20~～27℃) for 30min and observe the color of the solution and whether the solution is clear.
3) The solution can be diluted with hydrochloric acid = 1.18g/tnI. (Dangerous: (C)2. Prepare impurity standard samples. Due to the limited solubility of acid, use 40mL warm water instead of 25mL water to dissolve 2 samples (see 7.3.1 of HG/T2632-1994), and then dilute to 50mL (see 7.3.3 of IIG/T2632-1994).
7.4 Determination of iron content
7.4.1 Requirements
Iron content ≤ 0.002% (mass fraction). 7.4.2 Operating steps
Determine the iron mass percentage according to Chapter 7 of HG/T2632-1994. Weigh 1.90~2.10g of sample and prepare the sample according to 7.3.1.2 of HG/T2632-1994. Use 4mL of iron standard solution to prepare the impurity standard sample according to 7.3.2.2 of IIG/T2632-1994. Due to the limited solubility of boric acid, use 40mL of warm water instead of 25ml of water to dissolve 2g of sample, and then dilute to 50mL. 7.5 Appearance of solution
7.5.1 Requirements
The solution should be transparent and free of insoluble matter. Slight floccules are allowed. 7.5.2 Operation steps
Dissolve 50g of sample in 1L of water. Warm the solution if necessary. Place the solution at room temperature (20~～27℃) for 30min and observe the color of the solution and whether the solution is clear.
3) The solution can be diluted with hydrochloric acid = 1.18g/tnI. (Dangerous: (C)) preparation,
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