A kind of detection method of tartrazine
A detection method and tartrazine technology, which are applied in measurement devices, preparation of test samples, and color/spectral property measurement, etc., can solve the problems of complicated operation process, decomposition of analyte substances, and high time cost, and achieve simple operation process and increase The effect of active group content and low detection limit
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Embodiment 1
[0050] (1) Accurately weigh 1.0 g of humic acid (HA) and 30 mL of deionized water, add them to a 100 mL three-necked bottle in turn, and stir slowly at room temperature for 30 min. Add 15% sodium hydroxide solution dropwise to adjust the pH of the solution to be between 9 and 12. 2 After stirring for 10 min under protection, 5.32 mL of formaldehyde solution was slowly added dropwise, the temperature was raised to 85° C., and the temperature was pre-reacted for 1 h. Then add 7.86mL triethylenetetramine, then raise the temperature to 95°C, stop the reaction after 2.5h, cool to room temperature, adjust the pH to between 4 and 5 with sulfuric acid, reheat to 98°C for 4.5h, filter after the reaction, And dry in a vacuum oven at 50°C for 48 hours to obtain triethylenetetramine-modified aminated humic acid (HA-T).
[0051] (2) Weigh 1.5g of aminated humic acid and 1.0g of nano-SiO 2 , placed in a three-necked bottle with a capacity of 100mL, sequentially added 10mL of deionized wat...
Embodiment 2
[0056] Compared with Example 1, the only difference is that in step (2), the reaction temperature was changed to 65°C, 70°C, 80°C, and 85°C respectively, and the remaining conditions and steps were the same as in Example 1, so as to explore the effect of reaction temperature on HA- Effects of T-S nitrogen content changes.
[0057] The experimental result of embodiment 2 is as Image 6 It can be seen from the figure that the nitrogen content of HA-T-S shows a trend of first increasing and then decreasing with the increase of temperature. When the temperature reached 75°C, the nitrogen content of HA-T-S reached the highest, which may be due to the strong activity of triethylenetetramine at 75°C, resulting in high activity of its aminated modified molecules, which is easy to promote the preparation of composite materials; but with As the temperature continued to rise, the nitrogen content decreased rapidly. In the reaction, the temperature will affect the activity of each molec...
Embodiment 3
[0059] Compared with Example 1, the difference is only in step (2), the reaction time is changed to 1.0h, 1.5h, 2.5h and 3.0h respectively, and all the other conditions and steps are the same as in Example 1, so as to explore the effect of reaction time on HA- Effects of T-S nitrogen content changes.
[0060] The experimental result of embodiment 3 is as Figure 7 As shown, it can be seen from the figure that the nitrogen content of HA-T-S increases rapidly with the increase of reaction time and reaches the maximum at 2.0h. At the initial stage of the reaction, the concentration of aminated humic acid and nano-silica in the reaction system is relatively high, but with the formation of composite products, its body content and contact rate decrease, resulting in a decrease in the synthesis rate.
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Abstract
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