This standard specifies the technical requirements, test methods, inspection rules, packaging and marking of chemical reagent formic acid. This standard applies to the inspection of chemical reagent formic acid. GB/T 15896-1995 Chemical reagent formic acid GB/T15896-1995 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Chemical reagent
Formic acid
GB/T15896—1995
This reagent is a colorless transparent liquid with a pungent odor and can be mixed with water, alcohol, ether, and glycerol. The density (20℃) is about 1.22g/mL.
Indicative formula: HCOOH
Relative molecular mass: 46.03 (according to the 1991 international relative atomic mass) Subject content and scope of application
This standard specifies the technical requirements, test methods, inspection rules, packaging and marking of chemical reagent formic acid. This standard applies to the inspection of chemical reagent formic acid. 2 Reference standards
GB/T 601
GB/T602
GB/T 603
GB/T 619
GB/T 6682
GB/T 9728
GB/T 9729
GB/T9735
GB/T 9739
GB/T 9740
HG 3—119
3 Technical requirements
Chemical reagents
Chemical reagents
Chemical reagents
Chemical reagents
Preparation of standard solutions for titration analysis (volumetric analysis) Preparation of standard solutions for determination of impurities
Preparation of preparations and products used in test methods Sampling and acceptance rules
Specifications and test methods for water used in analytical laboratories Chemical reagents
Chemical reagents
Chemical reagents
Chemical reagents
Chemical reagents
Chemical reagents
Formic acid (HCOOH) Content:
General method for determination of sulfate
General method for determination of chloride
General method for determination of heavy metals
General method for determination of iron
General method for determination of evaporation residue
Packaging and mark
Analytically pure
Chemically pure
3.2 Maximum impurity content:
Approved by the State Administration of Technical Supervision on December 20, 1995 1162
≥88.0%;
≥85.0%.
Implemented on August 1, 1996
Mixing test with water
Evaporation residue
Chloride (CI)|| tt||Sulfite (S();)
Sulfate (SO))
Iron (Fe)
Heavy metals (measured in Pb)
4 Test method
GB/T15896—1995
Analytically pure
Chemically pure
Standard titration solutions, impurity standard solutions, preparations and products in this test method, unless otherwise specified, are prepared in accordance with the provisions of GB/T 601, GB/T602 and GB/T603. The experimental water should meet the third-grade water specifications in GB/T6682. 4.1 Determination of formic acid (HCOOH) content
Pour 15mL of carbon dioxide-free water into a stoppered light-bodied bottle, weigh it, add 1mL of sample, and weigh it again. Both weighings must be accurate to 0.0001g. Add 40mL of carbon dioxide-free water and 2 drops of phenolic acid indicator solution (10g/L), and titrate with sodium hydroxide standard titration solution [c(NaOH)=1 mol/L> until the solution turns pink. The formic acid content is calculated as follows:
V:c × 0. 046 03 × 100
Wherein: X-
-mass percentage of formic acid, %;
-volume of sodium hydroxide standard titration solution consumed by the sample, mL; -concentration of sodium hydroxide standard titration solution, mol/L; 0.04603-mass of formic acid equivalent to 1.00mL of sodium hydroxide standard titration solution Cc(NaOH)=1.000 mal/LJ, expressed in grams;
mass of the sample, g.
4.2 Determination of impurities
The sample must be measured accurately to 0.1mL.
4.2.1 Test for mixing with water
Measure 5 ml of sample, place in a 50 ml colorimetric tube, add 15 ml of water, and shake well. Leave for 1 hour, no turbidity. 4.2.2 Evaporation residue
Measure 41 ml (50 g) of sample, place in an evaporating dish that has been constant weight at 105 ± 2 °C, evaporate to dryness on a water bath, and dry in an electric oven at 105 ± 2 °C to constant weight. The result is calculated according to the provisions of Chapter 5 of GB/T9740 (retain the residue for iron measurement). 4.2.3 Chloride
Measure 1.6 ml (2 g) of sample, dilute to 20 ml, and determine according to the provisions of GB/T9729. The turbidity of the solution shall not be greater than the standard. The standard is to take the following amount of chloride impurity standard solution analytical pure
chemical pure ·
-0. 01 mgCl
.0. 02 mgCl
and treat it in the same way as the sample.
4.2.4 Sulfite www.bzxz.net
GB/T15896--1995
Measure 8.2mL (10g) of the sample, add 10mL of water and 0.05mL of iodine standard titration solution Cc (1/2Iz) 0.1mol/L3, and shake well. The solution should be obviously yellow.
4.2.5 Sulfate
Take 1.6mL (2g) of the sample, add 0.5mL of anhydrous sodium carbonate solution (50g/L), evaporate to dryness in a water bath, dissolve the residue in 15mL of water (filter if necessary), add 0.5mL of hydrochloric acid solution (20%) to acidify, and then measure according to the provisions of GB/T9728. The turbidity of the solution shall not be greater than the standard.
The standard is to take the impurity standard solution containing the following amount of sulfate: analytical pure
chemical pure
and treat it in the same way as the sample.
...0. 02 mgSO4
.0. 04 mgSO4
Add 2mL of hydrochloric acid solution (10%) to the residue after the evaporation residue determination (4.2.2), and evaporate to dryness on a water bath. Add 3 drops of hydrochloric acid solution (10%) and a small amount of water, dissolve the residue with warm water, and dilute to 100mL. Take 10mL, adjust the pH value of the solution to 2 with hydrochloric acid solution (15%), and then measure according to the provisions of GB/T9739. The red 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 iron: analytical pure.
chemical pure
dilute to 10mL, and treat it in the same way as the sample solution of the same volume. 4.2.7 Heavy metals
...0.015 mgFe
-0.025 mgFe
Measure 8.2mL (10g) of the sample, add 2 drops of sodium hydroxide solution (300g/L), and evaporate to dryness in a water bath. The residue is dissolved in 0.5mL of acetic acid solution (5%) and a small amount of water, and diluted to 20mL. Take 15mL and measure according to the provisions of GB/T9735. The dark color of the solution shall not be darker than the standard. The standard is to take the remaining 5mL of sample solution and the impurity standard solution containing the following amount of lead: analytical pure
chemical pure
dilute to 15'mL, and treat it in the same way as the sample solution of the same volume. 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
In accordance with the provisions of HG3-119, among which:
Inner packaging form: X-1, X-4,
Outer packaging form: W-1;
Packing unit: Class 3, 4.
6.2 Marking
In accordance with the provisions of HG3-119, and indicate "encapsulated products" and "corrosive items". 116!
.0.015 mgPb
.0.025 mgPb
Additional Notes:
GB/T15896—1995
This standard is proposed by 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 Beijing Chemical Factory. The main drafters of this standard are Hao Yulin and Jin Xiang. From the date of implementation of this standard, the former Ministry of Chemical Industry standard HG3-1296-80 "Formic Acid" will be invalid. 1165
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