碳点增敏的流动注射化学发光法测定食品中二氧化硫的含量

doi:10.3866/PKU.DXHX202204064

Abstract

Abstract:

The detection of sulfur dioxide is crucial for food safety. In this study, a flow injection chemiluminescence method for the determination of sulfur dioxide in food was established by using an acidic potassium permanganate sulfite system with carbon dots (CDs) as the sensitizer. Under the optimum experimental conditions, the linear range, and the detection limit of the method were 1.0 × 10⁻⁵–3.0 × 10⁻⁴ mol∙L⁻¹ and 7.79 × 10⁻⁶ mol∙L⁻¹, respectively. The experiment is suitable for teaching instrument analysis to undergraduates. This experiment enables students to master the principle and application of chemiluminescence and flow injection analysis, learn the basic methods of scientific research, and improve their thinking ability.

Key words: Flow injection, Chemiluminescence, Carbon dots, Sulfur dioxide, Food analysis

Shuo Cao, Honglin Zeng, Jiaxin Zhou, Siyuan Shao, Fengrui Liu, Haoran Chen, Fang Chen. Determination of SO₂ in Food by Flow Injection Chemiluminescence with Carbon Dots as Sensitizer[J].University Chemistry, 2023, 38(2): 170-176.

Figures/Tables 6

References 25

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样品	标准加入量/(mg∙kg⁻¹)	平均测得量/(mg∙kg⁻¹)	回收率/%	RSD/% (n = 4)
葡萄干	–	34.78	–	5.4
	31.5	66.02	99.2	3.4
	37.8	73.08	101.3	2.5
红枣	–	38.9	–	0.9
	37.8	76.2	98.7	4.1
	44.1	82.4	98.6	3.2
燕麦	–	41.4	–	4.1
	37.8	72.3	86.2	5.3
	44.1	81.8	91.7	3.2

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Determination of SO₂ in Food by Flow Injection Chemiluminescence with Carbon Dots as Sensitizer

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Determination of SO₂ in Food by Flow Injection Chemiluminescence with Carbon Dots as Sensitizer