HG/T 2629-1994 Chemical reagent barium hydroxide octahydrate (barium hydroxide)
Some standard content:
Chemical Industry Standard of the People's Republic of China
Chemical Reagents
Barium Hydroxide Octahydrate (Barium Hydroxide)
HG/T 2629
This standard refers to the international standard IS0) 6353/3-1987 "Chemical Analysis Reagents ~... Part 3: Specification R47\Barium Hydroxide Octahydrate".
Series 2"
This reagent is colorless or white crystals. Soluble in water; slightly soluble in ethanol. It absorbs carbon dioxide in the air to become barium carbonate. Toxic. Molecular formula: Ba(OH)2·8H20
Relative molecular mass: 315.47 (according to the international relative atomic mass in 1989). 1 Subject content and scope of application
This standard specifies the technical requirements, test methods, inspection rules, packaging and marking of the chemical reagent barium hydroxide octahydrate (barium hydroxide). This standard applies to the inspection of the chemical reagent barium hydroxide octahydrate (barium hydroxide). 2 Reference standards
GB/T 601
GB/T 602
GB/T603
GB/T 619
GB/T 6682
GB/T 9723
GB/T 9729
Chemical reagents
Preparation of standard solutions for titration analysis (volumetric analysis)Chemical reagents
Preparation of standard solutions for determination of impurities
Chemical reagents
Preparation of preparations and products used in test methodsChemical reagentsSampling and acceptance rules
Specifications and test methods for water in analytical laboratoriesChemical reagentsGeneral rules for flame atomic absorption spectrometryChemical reagents
GB/T 10726
General method for determination of chloride
Chemical reagentsGeneral method for determination of metallic impurities by solvent extraction atomic absorption spectrometryHG/T 3- 119
Packaging and marking of chemical reagents
HG/T 3—1168
3 Technical requirements
Preparation and determination method of clarity standard (glass emulsion method) 3.1 Content of barium hydroxide octahydrate [Ba(OH)·8H,O) : analytical pure
chemical pure…
3.2 Content of barium carbonate (BaCO),) ,% :
Analytical pure
chemical pure
3.3 Maximum content of impurities
Approved by the Ministry of Chemical Industry of the People's Republic of China on April 13, 1994 ≥98.0;
≥97.0.
≤2.0.
1 995-01-01 Implementation
Clarity test
Hydrochloric acid insoluble matter, %
Chloride (CI), %
Sulfide (S), %
Calcium (Ca), %
Iron (Fe), %
Strontium (Sr), %
Lead (Pb), %
Sulfuric acid non-precipitate, %
4 Test method
HG/T2629
Analytically pure
The standard titration solution, impurity standard solution, preparation and product in this test method shall be prepared in accordance with GB/T 601, GB/T602 and GB/T603 unless otherwise specified. The water used in the experiment shall meet the specifications of Grade 3 water in GB/T6682. 4.1 Determination of Ba(OH)2·8H2O Content Weigh 4 g sample (accurate to 0.0001 g). Dissolve in 200 mL of carbon dioxide-free water, add 2 drops of phenolic acid indicator solution (10 g/L), and titrate with hydrochloric acid standard titration solution [c(HCI)=1 mol/L) until the pink color of the solution disappears (retain the solution for determination of barium carbonate content). The content is calculated according to formula (1):
X,=V:G×0. 157 7
Wherein: X is the mass percentage of barium hydroxide octahydrate, %; V,--the volume of standard hydrochloric acid titration solution, mL; C - the actual concentration of standard hydrochloric acid titration solution, mol/L; m,
the mass of the sample, g;
(1)
0.1577--the mass of barium hydroxide octahydrate expressed in grams, equivalent to 1.00mL of standard hydrochloric acid titration solution (Lc(HCI)=1.000mol/L).
2 Determination of barium carbonate (BaCO:) content
Add 2.00mL of standard hydrochloric acid titration solution [c(HCl)=1mol/L] to the solution after the barium hydroxide content is determined (4.1), boil, cool, and titrate with standard sodium hydroxide titration solution (c(NaOH)=1 mol/L) until the solution turns pink. The content is calculated according to formula (2):
Wherein: X2
Xx = 2.0X-V2:c2) 0.09 67 ×10.m
Mass percentage of barium carbonate, %;
V—volume of standard sodium hydroxide titration solution, mL; c
Actual concentration of standard hydrochloric acid titration solution, mol/L; Actual concentration of standard sodium hydroxide titration solution, mol/L; (2)
0.098 67-
Mass of sample, g;
HG/T 2629-94
Mass of barium carbonate in grams equivalent to 1.00mL standard hydrochloric acid titration solution (Lc(HCI)=1.000mol/L). 4.3 Impurity determination
The sample must be weighed accurately to 0.01g.
4.3.1 Clarity test
Weigh 10g of sample and dissolve it in 94mL of water and 6mL of hydrochloric acid. Its turbidity shall not be greater than the clarity standard specified in HG/T3-1168:
Analytical pure...
Chemical pure...
4.3.2 Hydrochloric acid insoluble matter
No. 3:
No. 5.
Weigh 20g of sample and dissolve it in a mixed solution of 15mL of hydrochloric acid and 400mL of water, dilute to 500mL, filter with a No. 4 glass filter crucible that has been constant at 105±2℃, wash the filter residue with hot water until there is no chloride ion reaction in the washing liquid, and dry it in an electric oven at 105±2℃ to constant weight. The mass of the filter residue shall not be greater than:
Analytical pure
Chemical pure
4.3.3 Chloride
10mg.
Weigh 0.5g sample (chemically pure, take 0.2g), dissolve in 10mL water, neutralize with nitric acid solution (25%), and filter if necessary. After diluting to 20mL, measure according to GB/T9729. The turbidity of the solution shall not be greater than the standard. The standard is to take the impurity standard solution containing the following amounts of fluoride: analytical pure·
chemical pure·
dilute to 20mL, and treat it in the same way as the sample solution of the same volume. 4.3.4 Sulfide
0. 015 mg Cl;
0. 040 mg Cl.
Weigh 2g sample, dissolve in 10mL water and 5mL acetic acid, add 0.5mL lead acetate (alkaline solution), shake well, and the dark color of the solution shall not be darker than the standard.
The standard is to take the impurity standard solution containing the following amount of sulfide: analytical pure
chemical pure
and the sample is treated in the same way.
Determine according to the provisions of GB/T9723, where;
4.3.5.1 Instrument conditions
Light source: calcium hollow cathode lamp;
Wavelength: 422.7nm;
Flame: acetylene-air.
4.3.5.2 Determination method
0. 004mg S;
0. 020mg S.
Weigh 5g sample, dissolve in water, add 2.5mL hydrochloric acid, and dilute to 100mL. Take 10mL (chemical pure, take 4mL), a total of four portions. Determine according to the provisions of Article 6.2.2 of GB/T9723.
Measured according to GB/T10726, where:
4.3.6.1 Instrument conditions
Light source: iron hollow cathode lamp;
Wavelength: 248.3nm;
Flame: acetylene-air. www.bzxz.net
4.3.6.2 Determination method
HG/T 2629-94
Weigh 10g sample, dissolve in 160mL water, adjust the pH value of the solution to 3-6 with acetic acid, and dilute to 200mL. Take 40mL (chemically pure, take 8mL), a total of four portions. Determine according to Article 6.2.2 of GB10726. 4.3.7 Strontium
The determination shall be made in accordance with the provisions of GB/T9723, where:
4.3.7.1 Instrument conditions
Light source: strontium hollow cathode lamp;
Wavelength: 460.7nm;
Flame: acetylene-air.
4.3.7.2 Determination method
Weigh 2.5g sample, dissolved in water, add 2.5mL hydrochloric acid, dilute to 100mL, take 10mL, a total of four portions. Determine according to 6.2.2 of GB/T9723.
Determine according to GB/T10726, where:
4.3.8.1 Instrument conditions
Light source: lead hollow cathode lamp;
Wavelength: 283.3nm;
Flame: acetylene-air.
4.3.8.2 Determination method
Weigh 10g sample, dissolve in 160mL water, adjust the solution pH to 3-6 with acetic acid, and dilute to 200mL. Take 40mL, a total of four portions. Determine according to 6.2.2 of GB/T10726. 4.3.9 Sulfuric acid non-precipitate
Weigh 10g sample, dissolve in 150mL water, add hydrochloric acid to neutralize and excess 0.5mL, boil, add 22mL sulfuric acid solution (20%) to completely precipitate barium, cool, dilute to 200mL, let it stand to clarify, filter, take 100mL and evaporate on a water bath until almost dry, heat until sulfuric acid vapor escapes. Cool; soak the residue three times with 5mL hot water each time, filter. Place the filtrate in a crucible that has been constant weight at 800±50℃, evaporate to dryness, and burn at 800±50℃ to constant weight. The mass of the residue shall not be greater than: analytical pure·
chemical pure·
5 Inspection rules
Sampling and acceptance shall be carried out in accordance with the provisions of GB/T619. 6 Packaging and marking
6.1 Packaging
According to HG/T3-119, among which:
Inner packaging form G-3.Gz-—3;
Outer packaging form.W-1;
Packing unit: Class 4.
6.2 Marking
According to HG/T 3-119, and marked as "poisonous goods". 830
Additional instructions:
HG/T 2629-94
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Beijing Chemical Reagent General Factory. This standard is drafted by Tianjin Chemical Reagent Factory No. 3. The main drafters of this standard are Yang Cairu and Yu Weiguo. From the date of implementation of this standard, the original national standard of the People's Republic of China GB630--78 "Chemical Reagent Barium Hydroxide" will be invalid.
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