Method for quickly measuring content of sulfur dioxide in bergamot fruits by using Kjeldahl apparatus

A Kjeldahl nitrogen analyzer and sulfur dioxide technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of slow distillation and low efficiency, and achieve interference factors Less, good precision and accuracy, the effect of improving the detection limit

Inactive Publication Date: 2011-03-09
巩菊芳
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Problems solved by technology

[0003] The present invention aims at the shortcomings of slow distillation and low efficiency in the determination of bergamot sulfur dioxide in the prior art, and has invented a simple, fast and accurate

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  • Method for quickly measuring content of sulfur dioxide in bergamot fruits by using Kjeldahl apparatus
  • Method for quickly measuring content of sulfur dioxide in bergamot fruits by using Kjeldahl apparatus

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Embodiment 1

[0053] 1) Experimental principle

[0054] Hydrogen peroxide absorption method: its determination principle is to acidify the sample in a closed container and heat distillation to release the sulfur dioxide and the released SO 2 with neutral H 2 o 2Absorb, then titrate with NaOH standard solution, measure the end point with an acidity meter, calculate the SO in the sample according to the volume of NaOH consumed 2 content.

[0055] 2) Preparation of several main reagents

[0056] h 3 PO 4 Solution (1+3): Measure 250ml of phosphoric acid with a graduated cylinder, add 750ml of distilled water and shake well, put it into a reagent bottle for later use;

[0057] 0.010mol / L NaOH standard solution: Weigh 0.4g NaOH and add a small amount of water to dissolve until it reaches 1000ml, put it into a reagent bottle for later use;

[0058] 5%H 2 o 2 Solution: Measure 10.0ml of analytically pure H with a graduated cylinder 2 o 2 (30%), add water to 200ml, under the pH meter, tit...

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Abstract

The invention relates to a method for quickly measuring the content of sulfur dioxide in bergamot fruits by using a Kjeldahl apparatus. Aiming at the defects of low distillation speed, low efficiency and the like in measurement of the sulfur dioxide in the bergamot fruits in the prior art, the inventor invents a simple, quick and accurate method for quickly measuring the content of the sulfur dioxide in the bergamot fruits by using the Kjeldahl apparatus. Especially, compared with the prior art, the measuring efficiency of the method of the invention is improved by more than 5 times. The method of the invention mainly comprises the following steps: carrying out distillation by using the Kjeldahl apparatus, wherein the distilling process can be finished only in 10min; then, absorbing the released SO2 by neutral H2O2 by a hydrogen peroxide absorption method; titrating the released SO2 with a NaOH standard solution; measuring a terminal point by an acidity meter; and computing the content of the SO2 in the sample according to the volume of consumed NaOH.

Description

technical field [0001] The invention relates to a method for measuring the sulfur dioxide content of bergamot, in particular to a method for rapidly measuring the sulfur dioxide content of bergamot by using a Kjeldahl nitrogen analyzer. Background technique [0002] At present, the most commonly used methods for the determination of sulfur dioxide stipulated in the national standard GB / T 5009.34-1996 are pararosaniline hydrochloride colorimetry and distillation titration. Among the two methods, the former method is cumbersome and time-consuming, and the heavy metal pollution is serious. In actual operation, the distillation method is more convenient and feasible. The principle is to distill the sulfur dioxide in the sample with water vapor, and then carry out titration determination. Since the sulfite contained in some samples exists in food in a combined form, such as wine, preserved fruit and other samples, it must be distilled before determination, otherwise the result wi...

Claims

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Application Information

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IPC IPC(8): G01N21/80
Inventor 巩菊芳
Owner 巩菊芳
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