Some standard content:
HG/T 2760--1996
This standard amends and replaces HG3-947-76 "Chemical reagent zinc chloride". The revision refers to R96\zinc chloride in ISO6353-3:1987 "Chemical analysis reagents Part 3: Specifications - Second batch". Compared with the previous version, the test method has been changed accordingly to adopt international standards.
This standard will replace HG3-947-76 from the date of entry into force. This standard is issued by the Chemical Industry of the People's Republic of China. Proposed by the Technical Supervision Department of the Ministry of Industry. This standard is under the jurisdiction of Beijing Chemical Reagent General Administration. This standard was drafted by Beijing Beihua Fine Chemicals Co., Ltd. The main drafters of this standard are Guan Ruibao, Chen Hua, Qiang Jinglin and Liu Dongjue. 837
Molecular formula: ZnCl2
Chemical Industry Standard of the People's Republic of China
Chemical Reagent
Relative Molecular Mass: 136.30
1Scope
Zinc Fluoride
HG/T 2760 --- 1996
Replaces HG3-947-76
This standard specifies the technical requirements, test methods, inspection rules, packaging and marking of the chemical reagent zinc chloride. Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 601--1988
GB/T 602--1988
GB/T 603—1988
GB/T 619--1988
Chemical reagents Preparation of standard solutions for titration analysis (volume analysis) Chemical reagents Preparation of standard solutions for determination of impurities Chemical reagents
Preparation of preparations and products used in test methods Sampling and acceptance rules for chemical reagents
GB/T 6682-1992www.bzxz.net
GB/T 9723—1988
GB/T 9728—1988
GB 15346—1994
Specifications and test methods for water used in analytical laboratories (eqvISO3696:1987) Chemical reagents Flame atomic absorption spectrometry General principles Chemical reagents
Chemical reagents
HG/T 3---1168--1978
3 Properties
General method for determination of sulfate (egvISO6353-1:1982) Packaging and marking
Preparation and determination method of chemical reagent clarity standard This reagent is white granules or powder, soluble in water and easily deliquesced in air. 4 Specifications
Content (ZnCl2), %
Clarity test
Insoluble matter in dilute hydrochloric acid, %
Sulfate (SO4), %
Nitrate (NO4), %
Ammonium salt (NH4), %
Iron (Fe), %
Approved by the Ministry of Chemical Industry of the People's Republic of China on April 15, 1996 838
Implemented on January 1, 1997
Lead (Pb), %
Basic salt (ZnO Calculated), %
Ammonium sulfide non-precipitate (calculated as sulfate), %5Test
HG/T2760—1996
Table 1 (end)
Unless otherwise specified in this chapter, the standard titration solution, standard solution, preparation and product used shall be prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603. The experimental water shall comply with the third-grade water specification in GB/T6682. The samples shall be weighed to an accuracy of 0.01g. 5.1 Content
Weigh 0.3g sample (accurate to 0.0001g). Add 50mL water and a few drops of hydrochloric acid solution (20%) to dissolve, add 3g potassium sodium tartrate tetrahydrate, dissolve, neutralize with ammonia water and add 1mL in excess. Add 50 mg of chrome black T indicator and titrate with disodium ethylenediaminetetraacetic acid standard titration solution [c(EDTA) = 0.1 mol/LJ until the solution turns blue. The mass percentage is calculated according to formula (1):
Wherein: mass percentage of X-zinc fluoride, %; V*c× 136. 3
m ×1000
V—Volume of disodium ethylenediaminetetraacetate standard titration solution, mL, cConcentration of disodium ethylenediaminetetraacetate standard titration solution, mol/L; 136.3---Molar mass of zinc chloride (M(ZnCl2)], g/mol—Mass of sample, g.
5.2 Clarity test
Weigh 15g of sample and dissolve it in 10mL of hydrochloric acid solution (10%) and 90mL of water. Its turbidity shall not be greater than the following clarity standards specified in HG/T3--1168:
Analytically pure
5.3 Dilute Hydrochloric acid insolubles
Chemical pure
No. 2;
No. 4.
Weigh 50g of sample, dissolve in 20mL hydrochloric acid solution (10%) and 180mL water, keep warm in a water bath for 1h, filter with a No. 4 glass filter that has been dried to constant weight at (105±2)℃, wash the filter residue with hydrochloric acid solution (1+19), then wash with water until there is no chloride ion reaction in the washing liquid, dry in an electric oven at (105±2)℃ to constant weight, the filter residue mass shall not be greater than: Analytical pure
5.4 Sulfate
Chemical pure…
..2.5 mgt
..5.0mg.
Weigh 0.5g of sample, dissolve in 20mL of water and a few drops of hydrochloric acid solution (10%), dilute to 50mL, and take 10mL. After adding 0.5mL of hydrochloric acid solution (20%), measure according to the provisions of GB/T 9728. The concentration of the solution shall not be greater than that of the standard comparison solution. The preparation of the standard comparison solution is to take a sulfate standard solution containing the following amounts: analytically pure
chemically pure
dilute to 10mL and treat it in the same way as the same volume of test solution. 5.5 Nitrate
...0. 01 mg SO4.
....0.03 mg SO.
Weigh 0.5g sample, dissolve in 10mL water and a few drops of hydrochloric acid solution (10%), add 1mL sodium chloride solution (100g/L) and 1mL sodium indigo disulfonate solution c(C16H.N,NazO.S,)=0.001mol/LJ, add 10mL sulfuric acid within 10-15s under shaking, and let stand for 839
HG/T 2760--1996
10min. The blue color of the solution shall not be lighter than that of the standard comparison solution. The preparation of the standard comparison solution is to take a nitrate standard solution containing the following amounts: analytically pure
chemically pure
and treat it in the same way as the sample.
5.6 ammonium salt
0. 015 mg NO3 ;
.0. 030 mg NO3.
Weigh 1g sample, dissolve in water and a few drops of hydrochloric acid solution (10%), dilute to 100mL, take 10mL, add 10mL sodium hydroxide solution (100g/L), dilute to 50mL, add 2mL Nessler's reagent, spread evenly. The yellow color of the solution shall not be darker than the standard comparison solution. The preparation of the standard comparison solution is to take an ammonium standard solution containing 0.005mgNH, dilute to 10mL, and treat it in the same way as the same volume of test solution.
Weigh 1g sample, dissolve in 20mL water, add 2mL sulfosalicylic acid solution (100g/L), shake, add 5mL ammonia water, shake evenly. The yellow color of the solution shall not be darker than the standard comparison solution. The preparation of the standard comparison solution is to take the following amount of iron standard solution: analytical pure
chemical pure·
treat it in the same way as the sample.
Determine according to the provisions of GB/T9723, where: 5.8.1 Instrument conditions
Light source: lead hollow cathode lamp;
Wavelength: 283.3nm;
Flame: acetylene-air.
5.8.2 Determination method
.0. 005 mg Fe;
0. 020 mg Fe.
Weigh 25g sample, dissolve in 200mL water, add 5mL hydrochloric acid solution (10%), dilute to 250mL. Take 50mL (20mL of chemically pure), a total of four portions, and determine according to the provisions of 6.2.2 of GB/T9723. 5.9 Basic salt
Weigh 10g sample, dissolve in 80mL water, add 2 drops of methyl orange indicator solution (1 g/L),Titrate with hydrochloric acid standard titration solution [c(HCl)=1 mol/LJ until the solution turns star red. The amount of hydrochloric acid standard titration solution Lc(HCI)=1 mol/LJ should not exceed: analytical pure
chemical pure
5.10 Ammonium sulfide without precipitation
Weigh 5g of sample, dissolve in 225mL of water, boil, add 25mL of saturated ammonium sulfide solution, shake well, let stand for 34h, and filter with dense dry filter paper. Discard the first 20mL of filtrate, take 100mL and evaporate to dryness on a water bath, heat to remove ammonium salt, soak the residue with 20mL of hot water, and filter. Place the filtrate in a constant weight crucible at (800±25)℃, add 0.5mL of sulfuric acid, evaporate to nearly dryness, heat until sulfuric acid vapor escapes, and burn to constant weight at 800±25℃. At the same time, a blank test is conducted. The difference in the mass of the residue between the sample and the blank test shall not be greater than: analytical pure
chemical pure·
6 Inspection rules
Sampling and acceptance shall be carried out in accordance with the provisions of GB/T619. 840
..2.0mg;
..6.0mg.
Packaging and marking
HG/T 2760 - 1996
Packaging, storage and transportation shall be carried out in accordance with the provisions of GB15346, and marking shall be given, including: Packaging unit: Class 4;
Inner packaging form: NB-6, NBY-6, NB-9, NB-12, NB-14, NB-16; Isolation material: GC-2, GC-3;
Outer packaging form: WB-1, WB-2, WB-3. The label shall indicate "moisture-proof seal".
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