This standard specifies the technical requirements, test methods, inspection rules, packaging and marking of the chemical reagent bromothymol blue. This standard applies to the inspection of the chemical reagent bromothymol blue. GB/T 15352-1994 Chemical reagent bromothymol blue GB/T15352-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Chemical reagent
Bromothymol blue
GB/T15352—94
This reagent is a crystalline powder similar to lotus color or red, insoluble in water, easily soluble in ethanol, dilute alkali or ammonia solution. Molecular formula: CaHzO, BrzS
Structural formula:
CH, CH, CH,
Relative molecular mass: 624.39 (according to the international relative atomic mass in 1991) 1 Subject content and scope of application
This standard specifies the technical requirements, test methods, inspection rules, packaging and marking of the chemical reagent bromothymol blue. This standard applies to the inspection of the chemical reagent bromothymol blue. 2 Reference standards
GB/T 604
GB/T 619
GB/T 6682
GB/T 9721
GB/T 9741www.bzxz.net
HG 3-119
3 Technical requirements
Chemical reagents
General method for determination of pH color range of acid and base indicatorsSampling and acceptance rules
Chemical reagents
Specifications and test methods for water in analytical laboratories Chemical reagentsGeneral rules for molecular absorption spectrophotometry (ultraviolet and visible light part) Chemical reagents
Chemical reagents
General method for determination of ignition residue
Packaging and marking
3.1 pH color range: 6.0 (yellow) ~ 7.6 (blue). 3.2 Mass absorption coefficient (L/cm·g): 52.0. 3.3 Maximum impurity content:
Approved by the State Administration of Technical Supervision on December 22, 1994 1146
Implemented on October 1, 1995
Ethanol dissolution test
Ignition residue (calculated as sulfate), %
Test method
GB/T 15352--94
The pH buffer solution in this test method, unless otherwise specified, is prepared in accordance with the provisions of GB/T604, and the experimental water should meet the third-grade water specifications in GB/T6682.
4.1 pH color change range determination
Determined in accordance with the provisions of GB/T604.
4.2 Determination of mass absorption coefficient
Determine according to the provisions of GB/T9721, where: 4.2.1 Determination conditions
Light source: iodine tungsten lamp;
Wavelength: 618nm,
Thickness of absorption cell: 1cm,
Reference solution: water.
4.2.2 Determination method
Weigh 8mg sample, accurate to 0.00001g. Place in a 100mL volumetric flask, dissolve with ethanol (absolute ethanol), dilute to scale, and shake well. Measure 2.50mL of the above solution, place in a 25mL volumetric flask, dilute to scale with pH7.8 buffer solution, and shake well. Determine the absorbance.
4.2.3 Determination results
The mass absorption coefficient is calculated as follows:
Wherein: α mass absorption coefficient, L/cm·g, A——absorbance;
b——thickness of absorption cell, cm;
c——concentration of sample solution, mg/L;
1 000-conversion factor.
4.3 Impurity determination
The sample must be weighed accurately to 0.01g.
4.3.1 Ethanol dissolution test
×1000
Weigh 0.1g sample, dissolve in 50mL ethanol (absolute ethanol), and dilute to 100mL with water. The solution should be transparent. 4.3.2 Ignition residue
Weigh 0.5g sample and measure according to the provisions of Article 4.1 of GB/T9741. The results shall be calculated in accordance with the provisions of Chapter 5 of GB/T9741. 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: Gz-3;
Outer packaging form: W-1, W-5,
Packaging units: Class 2 and 3.
In accordance with the provisions of HG3-119.
Additional instructions:
GB/T 15352--94
This standard was 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 Shanghai Chemical Reagent Research Institute. The main drafters of this standard are Duan Qiaoyun, Shi Peifen and Hong Ruonan. From the date of implementation of this standard, the former Ministry of Chemical Industry Standard HG3-1222-79 Chemical Reagent Eugenol Blue will be invalid.
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