This standard specifies the method for determining the color of industrial alkylbenzenes. This standard is applicable to the determination of the color of industrial alkylbenzenes. GB/T 5177.1-1993 Determination of the color of industrial alkylbenzenes GB/T5177.1-1993 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Determibatfon af colour for Industrial alkylbenzene
Determibatfon af colour for Industrial alkylbenzeneGB/T 5177: 1—93
Replaces GB 5177.1-85
This standard adopts ISO 2211-1977 & Liquid chemicals-Determination of colour-in Hazen units (platinum-cobalt colour)). 1 Subject content and scope of application
This standard specifies the method for determining the colour of industrial alkylbenzene. This standard is applicable to the determination of the colour of industrial alkylbenzene. 2 Principle
Use a spectrophotometer to measure the absorbance of a series of colour standard solutions at a wavelength of 373nm and draw a colour standard curve. Taking advantage of the similar spectral characteristic absorption of industrial alkylbenzene samples and platinum-cobalt solutions, the absorbance of the sample is measured at the same wavelength, and then the corresponding platinum-cobalt colour value is found in the colour standard curve and expressed in Hazen colour units. Hazen color unit: the color of 1 mg of platinum (nitroplatinic acid form) and 2 mg of cobalt chloride hexahydrate per liter of solution. 3 Reagentsbzxz.net
3. 1 Potassium fluoroplatinate (K,PtCl,): analytical grade. 3.2 Cobalt fluoride (CoCl,·6H,0) (GB 1270): analytical grade. 3.3 Hydrochloric acid (GB622): 021.19. high grade. 4 Instrument
Spectrophotometer: an instrument with a wavelength of 373 nm, such as Model 721 or a spectrophotometer with equivalent performance. 5 Test body sequence
5. 1 Preparation of platinum-cobalt standard solution
Weigh 1.245 g potassium chloroplatinate and 1.000 g cobalt oxide, add 100 mL distilled water to dissolve, then add 100 mL concentrated hydrochloric acid to dissolve completely, then transfer to a 1000 mL volumetric flask, dilute to scale with distilled water. Transfer the above solution to 20 100 mL volumetric flasks according to the volume listed in Table 1, dilute to scale with distilled water, spread evenly, and prepare the ·· series color standard solution.
Approved by the State Administration of Technical Registration on February 15, 1993, implemented on 1993-1.0-01
Color value
5.2 Drawing the color standard curve
GB/T 5177. 1-93
Table 1 Preparation of color standard solution
Absorbance standard solution
Color value
Absorbance standard solution
Use a spectrophotometer at a wavelength of 373 ntm with a 5 cm and a 1 cm glass cell (a 5 cm cell is used when the color value is less than 100 Hazen) and distilled water as a reference to measure the absorbance of the 20 prepared color standard solutions and draw an absorbance-color value standard curve, as shown in Table 2, Figure 1, and Table 3, Figure 2,||tt ||Table 2 Absorbance values ​​with color values ​​less than 100 Hazen (using 5 cm cell) Color value, Hezen
Absorbance
Color value, Hazen
Absorbance
Color value, Hazen
Figure 1 Color curve (=373nm, color value less than 100 Hazen) 30
Color value, Hazen
Absorbance
5.3 Determination sample
GB/T 5177.1—93
Table 3 Absorbance values ​​with color values ​​greater than 100 Hazen (using 1 cm cell) 200
100150200250300350400450500
Color, Hazen
Figure 2 Color standard curve (>373nm, color value greater than 100 Hazen) 450
Put the sample into the absorption cell (if the sample is turbid or has suspended matter, it needs to be dried and filtered in advance), use a 5 cm cell for light-colored samples and a 1 cm cell for dark-colored samples, use distilled water as a reference, and measure the absorbance at a wavelength of 373:nm. According to the absorbance of the obtained sample, the corresponding color value is found from the absorbance-color value standard curve, which is the color value of the industrial alkylbenzene sample.
6 Precision
For the color value of this method at 570 Hazen, the maximum standard deviation is 2.60. Additional remarks:
This standard is proposed by the Ministry of Light Industry of the People's Republic of China. This standard is under the jurisdiction of the National Surfactant Detergent Standardization Center. This standard was drafted by the Daily Chemical Industry Science Research Institute of the Ministry of Light Industry. The main drafters of this standard are Wang Shuwei, You Lintai, and Wu Zhaohua.
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