TWI245897B - Method for testing the residual quantity of SO2 - Google Patents

Abstract

The invention is to use SO3(2-), S2O3(2-), and SO4(2-) to react with Zn powder catalyzed by HCl to perform an oxidation reaction to generate H2S. The generated H2S reacts with the Pb on a test paper to generate PbS whose color is dark brown. The darkness of the PbS on the test paper is different because of the various concentration of the PbS. By comparing the darkness on the test paper with the sample, the residual quantity of SO2 can be decided.

Description

1245897 fites) bleach and price, shrimp sulphate-producing banana sulphur, etc. Dioxide bleaching and the addition of sulphur oxidant and water for human asthma, but sulphur oxidant is therefore allowed to be used, its price is the same, There are many fruit products, grapes contain sulfur and sulfur, so they have more inhibition or residues, which may cause recurrence. Dioxide is only applicable to countries with many residues. The technology is related to the rapid detection of sulfur dioxide residues in processed foods. The simple test paper test method can quickly determine the residual amount of gold. It can quickly determine whether it meets the regulations of the competent authority for many years. It has a wide range of wine and starch, such as dehydrated and dried apricots. The longer the effect becomes, the longer the fumigation. Other substances can cause wheezing. Residues of large amounts of sulfur absorption are found in some foods. Southern California has been clearly defined. 5. Description of the invention (1) [The invention belongs to the present invention, which aims to provide a standard for needle sulfur dioxide. [Previous technology is based on the fact that the sub-products are not only oxidized and preservative vegetables and fruits, molasses commonly available in the market, jujube, dried, etc., but also have a whitening effect in the process of sterilization, sulfur mixed into food processing. Otherwise, pneumonia and the products that destroy the immersion water cannot effectively reduce the sulfate (S u 1 is very effective and other effects, and the sugar ulcerate fruit is added with bisulphite, dried and removed, and it also has a bleaching effect. In order to reach, sulfite is better, but sulfur dioxide is in the salt or sulfuric acid, which causes cough and lung function. Dilute it, and if it is low, add enzymes to French food and use it in products such as dehydration. Shuijinzheng, Yang, persimmon, and bamboo shoots can produce the dioxide fruit. Previously, the products became more uncomfortable after being combined with wheezing, etc., which can cause the food to be immersed and soaked in water before use. two

1245897 V. Description of the invention (2) Residual amount of sulfur oxide, even prohibiting the use of sulfur dioxide in fresh food, including fruits. However, the establishment of standards for food sulfur dioxide residues and the inspection and testing business are mainly responsible by the competent authority (currently the relevant competent authority in the country is the Department of Health). The scope of its business covers the number of inspected manufacturers and foods. A faster and simpler detection method is needed to meet the needs of its business volume. This method can also provide general non-governmental operators to carry out rapid monitoring on their own, in order to achieve the purpose of independent management and effective control of the sulfur dioxide residue in food to ensure the food Safety and health indicators. [Summary of the invention] The present invention "a method for detecting the residual amount of sulfur dioxide" is to first complete the preparation of sulfur dioxide test paper with a quantitative amount of acetic acid, and then combine the quantitative zinc powder with the aforementioned sulfur dioxide test paper to complete the preparation of a colorimetric panel; In the actual detection, the quantitative test sample is first combined with the unused sulfur dioxide test paper, using S03l, S 2 0 32-, so42_ and zinc powder under the catalysis of hydrochloric acid to generate hydrogen sulfide, and the hydrogen sulfide is It reacts with the wrong reaction on the test paper to form dark brown lead sulfide. Due to the different concentrations, the test paper shows different degrees of dark brown 'color. The colorimetric method is used to determine the residual sulfur dioxide content in the sample. [Embodiment] The present invention "a method for detecting the residual amount of sulfur dioxide" is to complete the preparation of sulfur dioxide test paper with a quantitative amount of lead acetate, and then combine the quantitative zinc powder with the aforementioned sulfur dioxide test paper to complete the preparation of a colorimetric panel; In the actual test, first quantify the sample to be tested with the unused sulfur dioxide test paper.

1245897 V. Description of the invention (3) Combining, using S 032—, S2032—, S42— and zinc powder under the catalysis of hydrochloric acid, the oxidation reaction produces hydrogen sulfide, and the hydrogen sulfide reacts with the wrong reaction on the test paper. The dark brown lead sulfide is formed. Due to the difference in concentration, the degree of dark brown on the test paper is different. The residual amount of sulfur dioxide contained in the sample is determined by colorimetric method; the reaction formula is as follows: H2S〇3 + 3Zn + 6HC1 ~ > II2S + 3ZnCl2 + 3H20 H2S + Pb (C2H 3 02) 2 — PbS (black precipitate) In order to make your review committee aware of the overall operation of the present invention, the data of sulfur dioxide residual detection for gold needles is provided, with the illustration It is as follows: First, the preparation technology of sulfur dioxide test paper is explained. As shown in the first figure, it includes the following procedures: A • Weigh 5 grams of acetic acid into a 500 m L quantitative bottle and add steamed Water is mixed evenly to the marked line; 'B · After heating at 50 ° C for 10 minutes at a fixed temperature, it is quickly cooled with running water; C • The cooled solution is filtered with Whatman 5 filter paper, and the filtrate is stored in plastic In; D · taken using the filter was immersed in the filtrate; E · soak 1 to about 6 hours to be dry by preparing strips of sulfur dioxide adsorption filter until the filtrate was completed.

1245897 V. Description of the invention (4) The preparation of standard colorimetric plates for sulfur dioxide test paper will be explained. As shown in the second figure, it includes the following procedures: A. Take 2 mL of the standard solution and place it in 250 mL In the Erlenmeyer flask (quantitative flask), the standard solution is weighed with Na2S2 05 reagent to prepare six different concentrations of 20ρριη, 40 ppm, 60 ppm, 80 ppm, 100 ppm, and 200 ppm; B. Add about one A small spoon of quantitative zinc powder (Z inkp〇wder); C. Add 2 ml of 6 NHC 1 solution D. Quickly cover the sulfur dioxide test paper and hold it down with glass; E. Wait about ten minutes for the sulfur dioxide test paper After accurately reacting with the solution, remove the sulfur dioxide test paper to complete the preparation of the standard colorimetric plate. Therefore, the present invention can prepare a plurality of sulfur dioxide test papers and colorimetric plates in advance according to the aforementioned steps for actual detection; as for the analysis of the sample (also taking the sulfur dioxide detection for gold needles as an example) includes the following procedures: A · 'Take a 5 g sample of dried gold needles, finely crush and add a quantitative amount of 500 m L of distilled water to make it a sample solution (homogeneous in a homogenizer for about 1 minute to reach full homogeneity); B · Take 2 m L of The sample solution was placed in a 250 ml L-triangular flask (volume bottle). C. Add about a teaspoon of a certain amount of zinc powder. D. Add 2 ml of 6 NHC 1 solution. E. Quickly cover the Use the sulfur dioxide test paper and hold it down with the cover glass; F. Wait about ten minutes for the sulfur dioxide test paper to react accurately with the solution and remove it.

1245897 V. Description of the invention (5) Sulfur dioxide test paper; G · Control standard _ The color depth of the color plate, determine the residual amount of sulfur dioxide Η · Multiply the dilution factor to obtain the residual sulfur dioxide amount of the dried gold needle. Based on this, a The simple and fast test paper construction method can quickly determine the amount of sulfur dioxide in the gold needle, and quickly determine whether it meets the 400 000 ppm standard set by the Department of Health. As described above, the present invention provides another preferred and feasible method for detecting sulfur dioxide residues, which is to file an application for an invention patent according to the law; however, the above implementation description and drawings are one of the preferred embodiments of the present invention It is not intended to limit the present invention, but any similarity or similarity with the structure, device, features, etc. of the present invention shall fall within the scope of the invention and the scope of patent application.

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Claims (1)

1245897 6. Scope of patent application 1. A method for detecting the residual amount of sulfur dioxide. First, the preparation of sulfur dioxide test paper is completed with a predetermined amount of lead acetate, and then the quantitative zinc powder is combined with the foregoing sulfur dioxide test paper to complete the preparation of a colorimetric board; In the actual test, a quantitative test sample is first combined with an unused sulfur dioxide test paper, and S 032_, S2 03t, so42— and zinc powder are catalyzed by hydrochloric acid to perform an oxidation reaction to generate hydrogen sulfide. The reaction of lead leads to the formation of dark brown lead sulfide. Due to the different concentrations, the degree of dark brown on the test paper is different. The colorimetric method is used to determine the residual sulfur dioxide content in the sample. 2. As described in item 1 of the scope of the patent application, "a method for detecting the residual amount of sulfur dioxide", wherein the preparation of the sulfur dioxide test paper includes the following procedures: 1 A · Weigh a certain amount of lead acetate into a quantitative bottle, add distilled water and mix Uniform; B · After heating at a constant temperature, quickly cool with running water; C · Filter the cooled solution with filter paper and store the filtrate in a plastic basin; D ·: Take the used filter paper and soak in the filtrate;, E · After the filter paper adsorbs the filtrate and air-dries, the preparation of sulfur dioxide test paper is completed. 3. As described in item 1 of the scope of the patent application, "a method for detecting the residual amount of sulfur dioxide", wherein the preparation of the colorimetric plate includes the following procedures A · Take a quantitative standard solution and place it in a quantitative bottle; B · Add quantitative Zinc powder; C · Add quantitative solution of 6 NH C1 Page 12 1245897 VI. Application scope D • Quickly cover the sulfur dioxide paper 1 and press it with the watch glass. E • After the sulfur dioxide paper reacts with the solution accurately, remove the sulfur dioxide paper and it can be used as the standard ratio. Preparation of swatches 04 A method for detecting sulfur dioxide residues in the plant described in item 1 of the patent Γ / Γ Chapter 巳, where the detection and analysis of the sample includes the following procedures • A • Take a quantitative test sample 5 finely divided Then add quantitative τKK distilled water to make sample solution B. Take a quantitative sample solution and put it into a quantitative bottle C. Add a quantitative zinc powder D. Then add a quantitative 6N HC 1 solution j E. Quickly cover the unused sulfur dioxide speech paper. And press F with the watch glass. After the sulfur dioxide speech paper and the solution react accurately The lower sulfur dioxide test paper G • j is darker and lighter than the standard reference color plate, and the residual amount of sulfur dioxide is determined. • Multiply it by the dilution factor to obtain the residual sulfur dioxide of the dried gold needles. I-Method j for sulfur oxide residue, where the standard solution is prepared with Na:? S2 05 (s < 3d iui Ή me ta bi SU If it e). Page 13