HG/T 2630-1994 Chemical reagent lead acetate trihydrate (lead acetate)
Some standard content:
Chemical Industry Standard of the People's Republic of China
Chemical Reagents
Lead Acetate Trihydrate (Lead Acetate)
HG/T 2630 -- 94
This standard refers to R71 "Lead Acetate Trihydrate" in the international standard ISO6353-3:1987 "Chemical Analysis Reagents Part 3: Specification Series 2".
This reagent is colorless crystal or white powder, soluble in water, toxic, efflorescent, and can absorb carbon dioxide in the air to become a basic carbonate that is insoluble in water.
Molecular formula: Pb(CH.COO),·3H,O
Relative molecular mass: 379.33 (according to the international relative atomic mass in 1989). Subject content and scope of application
This standard specifies the technical requirements, test methods, inspection rules, packaging and marking of the chemical reagent lead acetate trihydrate. This standard applies to the inspection of the chemical reagent lead acetate trihydrate. 2 Reference standards
GB/T601
GB/T 602
GB/T603
GB/T 609
GB/T 619
GB/T 6682
GB/T 9723
GB/T 9729
GB/T 9738
Chemical reagents
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 General method for determination of total nitrogen
Sampling and acceptance rules
Specifications and test methods for water used in analytical laboratories Chemical reagents
Chemical reagents
Chemical reagents
General rules for flame atomic absorption spectrometry
General method for determination of chloride
General method for determination of water-insoluble matter
HG/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 single liquid method) 3.1 Content of lead acetate trihydrate [Pb(CH.COO)·3H,O), %: analytically pure
chemically pure·
3.2 Maximum impurity content
Approved by the Ministry of Chemical Industry of the People's Republic of China on April 13, 1994 1188
Implementation on January 1, 1995
Clarity test
Water-insoluble matter, %
Chloride (C1), %|| tt||Total nitrogen (N), %
Sodium (Na), %
Potassium (K), %
Calcium (Ca), %
Iron (Fe), %
Copper (Cu), %
4 Test method
HG/T2630-94
The standard titration solution, impurity standard solution, preparation and product in this test method shall be prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603 unless otherwise specified. The experimental water shall meet the third-grade water specifications in GB/T6682. 4.1 Determination of the content of lead acetate trihydrate [Pb(CH;COO)·3H,O] Weigh 0.6g sample (accurate to 0.0001g). Dissolve in 100mL water, add 0.2mL acetic acid and 5g hexamethylenetetramine, add 2 drops of xylenol orange indicator (2 g/L), and titrate with disodium ethylenediaminetetraacetic acid standard titration solution (c(EDTA)=0.05 mol/L) until the solution turns bright yellow.
The mass percentage content is calculated according to formula (1):
X(%) = V·c× 0. 379 3 × 100m
Wherein; X——-mass percentage content of lead acetate trihydrate, %; V—volume of disodium ethylenediaminetetraacetic acid standard titration solution consumed by the sample, mI, and the actual concentration of disodium ethylenediaminetetraacetic acid standard titration solution, mol /L,m——mass of sample, g;
0.3793---mass of lead acetate trihydrate expressed in grams equivalent to 1.00mL of standard titration solution of disodium ethylenediaminetetraacetic acid Cc(EDTA)=1.000mol/LJ.
4.2 Determination of impurities
Sample weighing must be accurate to 0.01g.
4.2.1 Clarity test
Weigh 10g of sample, dissolve in 100mL of water without carbon dioxide, add 0.5mL of acetic acid, and its turbidity shall not be greater than the clarity standard specified in HG/T3--1168. || tt||Analytically pure
Chemically pure
4.2.2 Water-insoluble matter
No. 3;
·No. 5.
Weigh 20g of sample, dissolve in 200mL of water, add 1mL of acetic acid, filter with a No. 4 glass filter crucible that has been constant weight at (105±2)℃, first wash the filter residue with acetic acid solution (5%) until the washing liquid is free of lead ion reaction, then wash the filter residue with water, and dry it in an electric oven at 105±2℃ to constant weight. The results are calculated according to the provisions of Chapter 7 of GB/T9738. 4.2.3 Chloride
Weigh 2g of sample, dissolve in 20mL of water, and calculate according to GB/T 9729 provisions. The turbidity of the solution shall not be greater than the standard. 1189
HG/T 2630-94
Standard recommendation is to take the impurity standard solution containing the following amount of chloride: analytical pure...
chemical pure
and treat it in the same way as the sample.
4.2.4 Total nitrogen
0. 01 mg Cl;
..0. 04 mg C1.
Weigh 1g sample, dissolve it in 140mL water, and measure it according to GB/T609. The yellow color of the solution shall not be darker than the standard. Analytical pure…
Chemical pure·
Treat it in the same way as the sample.
Measure it according to GB/T9723, where:
4.2.5.1 Instrument conditions
Light source: sodium hollow cathode lamp;www.bzxz.net
Wavelength: 589.0nm;
Flame: acetylene-air.
4.2.5.2 Determination method
...0. 01 mg N;
...0. 02 mg N.
Weigh 2g sample, dissolve it in water, add 1mL acetic acid, and dilute to 100ml. Take 20mL (chemical pure, take 5mL), a total of four portions. Determine according to 6.2.2 of GB/T9723.
Determine according to GB/T9723, where:
4.2.6.1 Instrument conditions
Light source: potassium hollow cathode lamp;
Wavelength: 766.5nm;
Flame: acetylene-air.
4.2.6.2 Determination method
Same as 4.2.5.2.
Determine according to GB/T9723, where:
4.2.7.1 Instrument conditions
Light source: calcium hollow cathode lamp;
Wavelength: 422.7nm;
Flame acetylene-air.
4.2.7.2 Determination method
Weigh 10g of sample, dissolve in water, add 1mL of acetic acid, and dilute to 100mL. Take 20mL (5mL for chemically pure), four portions in total. Determine according to 6.2.2 of GB/T9723.
Weigh 0.5g sample, dissolve in appropriate amount of water, add 0.2mL acetic acid, dilute to 15mL. Add 1mL ascorbic acid solution (20g/L), 5mL acetic acid-sodium acetate buffer solution (pH4.5), 1ml. o-phenanthroline solution (2g/L), dilute to 25mL, shake well, let stand for 15min, the red color of the solution shall not be darker than the standard.
Standard Take the impurity standard solution containing the following amount of iron: analytical pure
Treat it in the same way as the sample.
Chemically pure
0. 005 mg Fe;
...0. 010 mg Fe.
Determine according to GB/T9723, where:
4.2.9.1 Instrument conditions
Light source: copper hollow cathode lamp;
Wavelength: 324.7nm;
Flame: acetylene-air.
4.2.9.2 Determination method
HG/T 2630— 94
Weigh 20g sample, dissolve in water, add 1mL acetic acid, dilute to 100mL. Take 20mL (chemically pure, take 4mL), a total of four portions. According to 6.2.2.
5 Inspection rules
Sampling and acceptance shall be carried out in accordance with GB/T619. 6 Packaging and marking
6.1 Packaging
In accordance with HG/T 3-119, among which:
Inner packaging form: G-3, Gz-3;
Outer packaging form: W-1;
Packing unit: Class 4.
6.2 Marking
In accordance with HG/T3--119, and indicate the words "poisonous goods" and the mark "sealed". Additional remarks:
This standard was 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. This standard was drafted by Shanghai Chemical Reagent Factory No. 4. The main drafter of this standard is Li Baozhen.
This standard was first issued in 1959 and revised in 1976. 1191
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