GB/T 15901-1995 Chemical reagent Cupric chloride dihydrate (copper chloride)
Some standard content:
National Standard of the People's Republic of China
Chemical reagent
Copper( I ) chloride dihydrate This reagent is light blue crystals and is soluble in water. Molecular formula: CuCl2·2H,0
Relative molecular mass: 170.48 (according to the international relative atomic mass in 1991) Subject content and scope of application
GB/T15901--1995
This standard specifies the technical requirements, test methods, inspection rules, packaging and marking of the chemical reagent copper chloride dihydrate. This standard is applicable to the inspection of the chemical reagent copper chloride dihydrate. 2 Reference standards
GB/T 601
GB/T 602
GB/T 603
Chemical reagents-Preparation of standard solutions for titration analysis (volumetric analysis) Chemical reagents
Preparation of standard solutions for determination of impurities
Preparation of preparations and products used in chemical reagent test methods GB/T 610.2
GB/T 619
GB/T 6682
GB/T 9723
GB/T 9738
HG 3—119
3 Technical requirements
Chemical reagentsGeneral method for determination of arsenic (silver diethyldithiocarbamate method)Chemical reagents sampling and acceptance rules
Specifications and test methods for water used in analytical laboratoriesChemical reagents
General rules for flame atomic absorption spectrometry
Chemical reagents
Chemical reagents
General method for determination of water-insoluble matter
Packaging and marking
3.1 Copper chloride dihydrate (CuCl2·2H,O)Content: analytically pure
Chemically pure·
3 .2 Maximum impurity content:
Water insoluble matter
Sulfate (SO,)
Nitrate (NO,)
Approved by the State Bureau of Technical Supervision from December 20, 1995Analytical pure
≥99.0%;
≥98.0%.
Chemical pure
Implemented on August 1, 1996
Arsenic (As)
Iron (Fe)
Nickel (Ni)
Hydrogen sulfide non-precipitate (calculated as sulfate) 4 Test method
GB/T 15901-—1995
Analytically pure
Chemically pure
The standard titration solution, impurity standard solution, preparation and product in this test method shall be prepared according to the provisions of GB/T601, GB/T602 and GB/T603 unless otherwise specified. The experimental water shall meet the specifications of Grade 3 water in GB/T6682. 4.1 Determination of the content of cupric chloride monohydrate (CuCl,·2H,0) Weigh 0.5g of the sample to an accuracy of 0.0001g, place it in an iodine volumetric bottle, dissolve it in 50mL of water, add 5mL of sulfuric acid solution (20%) and 3g of potassium iodide, and shake well. Titrate with sodium thiosulfate standard titration solution Lc(NazS2O,)-0.1mol/L], and when it is close to the end point, add 3mL of starch indicator solution (10g/L) and continue to titrate until the blue color of the solution disappears. Perform a blank test at the same time. The content of cupric chloride dihydrate is calculated as follows: Where: ~
(V, - Vz) c× 0. 170 5 × 100mwww.bzxz.net
—mass percentage of cupric chloride dihydrate, %; V.- volume of sodium thiosulfate standard titration solution, mL; V,—volume of sodium thiosulfate standard titration solution consumed in blank test, mL; concentration of sodium thiosulfate standard titration solution, mol/L; 0.1705—mass of cupric chloride dihydrate equivalent to 1.00mL sodium thiosulfate standard titration solution [c(Na2S2O:）1.000mol/L], expressed in grams;
m-mass of sample, g.
4.2 Determination of impurities
The sample must be weighed accurately to 0.01g.
4.2.1 Water-insoluble matter
Weigh 20g of sample, dissolve in 150mL of hot water, add 1mL of hydrochloric acid, keep warm in a water bath for 1h, filter with a No. 4 glass filter crucible that has been constant weight at 105±2℃, wash the filter residue with hot water until the washing liquid is colorless, and dry in an electric oven at 105±2℃ to constant weight. The results are calculated according to the provisions of Chapter 7 of GB/T9738.
4.2.2 Sulfate
4.2.2.1 Preparation of copper chlorofluoride dihydrate solution without sulfate Weigh 5g of sample, dissolve in 30mL of water, add 10mL of 95% ethanol, 2.5ml of hydrochloric acid solution (20%), add 5mL of chlorination solution (250g/L) dropwise under continuous shaking, dilute to 50mL, let stand for 12~~18h, and filter. 4.2.2.2 Determination method
Weigh 1g of sample, dissolve in 10mL of water, add 5mL of 95% ethanol, 0.5mL of hydrochloric acid solution (20%), add 3mL of barium chloride solution (250g/L) under continuous shaking, dilute to 25mL, shake well, and let stand for 10min. The turbidity of the solution shall not be greater than the standard. The standard is to take 10mL of copper chloride dihydrate solution without sulfate and impurity standard solution containing the following amount of sulfate: analytical pure
chemical pure
: 0.03 mgSO
: 0.10 mgs0.
Add 3mL.95% ethanol, add 2mL of barium chloride solution (250g/L.) under continuous shaking, dilute to 25mL, and treat in the same way as the same volume of sample solution at 818
.
4.2.3 Nitrate
GB/T159011995
Weigh 1g of sample, dissolve in 10ml of water, add 10mL of sodium hydroxide solution (100g/L), heat on a water bath for 15min, cool, dilute to 100ml, and filter. Take 10ml, add 1ml of sodium chloride solution (100g/L), 1mL of sodium indigo disulfonate solution [c(Cn.HN,Naz().S,）=0.001mol/L], add 10mL of sulfuric acid within 10-15s under shaking, and let stand for 10min. The blue color of the solution shall not be lighter than the standard.
The standard is to take the impurity standard solution containing the following amounts of nitrate: analytical pure·
chemical pure·
dilute to 10 ml, and treat it in the same way as the sample solution of the same volume. 4.2.4 Arsenic
0. 01 mgNO3
0. 03 mgNO.
Weigh 1g of sample, dissolve in 40mL of water, add 1mL of nitric acid, 1ml of ammonium ferric sulfate solution (10g/L), boil for 2min, cool, add ammonia solution (10%) dropwise until the generated precipitate dissolves, and add 2mL in excess, cover the surface with blood, keep warm in a water bath for 30min, filter, wash the precipitate with ammonia solution (1+25) until the blue color on the filter paper disappears completely. Dissolve the precipitate with 2mL of hot hydrochloric acid solution (20%) and wash with water, collect the filtrate and washing liquid, dilute to 40ml, inject into the arsenic determination bottle, and determine according to the provisions of GB/T610.2. The purple-red color of the absorption liquid shall not be deeper than the standard.
The standard is to take the impurity standard solution containing the following quantities: analytical pure...
chemical pure
Add 2mL of hydrochloric acid solution (20%), dilute to 40mL, and treat it in the same way as the sample solution of the same volume. 4.2.5 Iron
Determine according to the provisions of GB/T9723, where: 4.2.5.1 Instrument conditions
Light source: iron hollow cathode lamp;
Wavelength: 248.3nm;
Flame: acetylene-air.
4.2.5.2 Determination method
0.002mgAs
0.005 mgAs
Weigh 10g of sample, dissolve in water, dilute to 100mL, take 20mL, a total of four portions, and determine according to the provisions of Article 6.2.2 of GB/T9723. 4.2.6 Nickel
The determination shall be made in accordance with the provisions of GB/T9723, where: 4.2.6.1 Instrument conditions
Light source: nickel hollow cathode lamp;
Wavelength: 232.0nm;
Flame: acetylene-air.
4.2.6.2 Determination method
Same as 4.2.5.2.
4.2.7 Hydrogen sulfide does not precipitate
Weigh 5g of sample, dissolve in 150mL of water, add 5mL of sulfuric acid, dilute to 200mL, heat to 70-80℃, pass hydrogen sulfide to completely precipitate copper. Filter, take 80mL, evaporate to nearly dryness on a water bath, heat until sulfuric acid vapor escapes, take 25mL of hot water to fill the residue, filter, place the filtrate in a crucible that has been burned at 800℃ to constant weight, evaporate to dryness on a water bath, and burn to constant weight at 800℃. The mass of the residue shall not be greater than: Analytical pure·
Chemical pure··
Inspection rules
GB/T15901—1995
Sampling and acceptance shall be carried out in accordance with the provisions of GB/T619. Packaging and marking
According to the provisions of HG3-119, among which:
Inner packaging form: G-3, Gz-3;
Outer packaging form: W-1;
Packaging unit: Class 4.
Additional instructions:
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 was drafted by Chengdu Chemical Reagent Factory. The main drafter of this standard is Chen Junru.
From the date of implementation of this standard, the original Ministry of Chemical Industry standard HG3--930-76 "Chemical Reagent Copper Chloride" will be invalid.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.