Potassium bromated test paper and standard color matching card thereof

A technology for detecting test paper and potassium bromate, which is applied in the direction of analyzing materials through chemical reactions and observing the impact on chemical indicators. High, can not meet the problems of rapid detection, to achieve the effect of not easy to coexist ion interference, wide application value and market development prospect, simple production

Inactive Publication Date: 2015-07-08
GUANGDONG PHARMA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ion chromatography equipment is expensive and difficult to popularize, and the detection limit of reduction titration is high; spectrophotometry is widely used because of its low price and high detection sensitivity.
[0007] The instrumental analysis method has high measurement accuracy and detection limit, but the pretreatment is complicated and the equipment is expensive, and professional operation is required, which cannot meet the needs of actual on-site rapid detection
General chemical methods such as: gravimetric method, volumetric method, etc., are difficult to apply on-site rapid detection due to cumbersome operation and many vessels

Method used

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  • Potassium bromated test paper and standard color matching card thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Reagent preparation

[0027] Potassium bromate standard solution (1.0 mg / mL): Weigh 0.1305 g of analytically pure potassium bromate dried in a benchtop drying oven, dissolve in water, and dilute to 100 mL. Before use, take 10mL of the mother liquor in a 100mL volumetric flask, add water to dilute to 100mg / L.

[0028] Neutral red solution (1.00×10 -4 mol / L): Accurately weigh 0.2883g of neutral red, add 25ml of 95% ethanol, and dissolve in a beaker. Sonicate with an ultrasonic oscillator to dissolve completely, transfer to a 100ml volumetric flask, add water to the mark, and make 1.00×10 -2 mol / L mother liquor. Precisely draw 2.50ml from the mother liquor to a 25ml colorimetric tube, add water to the mark, and make 1.00×10 -3 mol / L solution; then accurately draw 2.50ml from the above solution to a 25ml colorimetric tube, add water to the mark, and make 1.00×10 -4 mol / L dye solution.

[0029] Hydrochloric acid: 2mol / L. Take 41.7ml of concentrated hydrochl...

Embodiment 2

[0031] Example 2 Preparation of Potassium Bromate Detection Test Paper

[0032] Select qualitative filter paper as the carrier, cut into 1.2×3 (cm) test paper strips, and evenly soak in 100mL newly prepared 5×10 -5 mol / L neutral red solution. After soaking for 6 minutes, take out the test paper strip, and let it dry naturally in a cool and dry place to make a potassium bromate test paper. The prepared potassium bromate detection test paper is stored in a closed brown bottle at low temperature (2-8°C), and the test paper strip should be protected from contamination.

Embodiment 3

[0033] The preparation of embodiment 3 standard color card

[0034] Preparation of potassium bromate standard series: Add 5.00, 10.00, and 15.00 mL of 100 mg / L potassium bromate solution to three 100 mL volumetric flasks respectively, then add 25 mL of 2 mol / L hydrochloric acid to each tube, add water to the mark line, and mix well. Potassium bromate concentrations were 5.0, 10.0, 15.0 mg / L, respectively.

[0035] Transfer the above potassium bromate standard solution to a small beaker respectively, and soak the test paper strips in the above standard solutions of different concentrations to completely wet them. After 4 minutes, take it out and shake off the excess water. The color stability time is about 30 minutes. Make a standard color scale according to the fading situation, and arrange the obtained image according to the concentration of potassium bromate from low to high. A standard color card for detecting different concentrations of potassium bromate was made. The ...

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Abstract

The invention discloses a potassium bromated test paper and a standard color matching card thereof. The test paper provided by the invention is prepared from the following steps of: soaking either filter paper or thin layer chromatographic paper into 3*10<-5>-7*10<-5>mol / L of neutral red solution, taking out the test paper after either the filter paper or the thin layer is soaked for 3-7 minutes, and drying, thereby obtaining the potassium bromated test paper. The test paper has the characteristics of being rapid in detection, cheap in cost, convenient to take, less in possibility of being disturbed by co-existing ions and the like, so that the test paper has extensive application value and market development foreground.

Description

technical field [0001] The invention belongs to the field of food analysis and detection, and in particular relates to a potassium bromate detection test paper and a standard color comparison card thereof. Background technique [0002] Potassium bromate has a molecular formula of KBrO3 and a molecular weight of 167.01. Potassium bromate is a colorless triangular crystal or white crystalline powder, which decomposes at about 370°C with oxygen evolution. It is mainly used as analytical reagent, oxidizing agent, food additive (now banned in China), and wool bleaching agent. [0003] Potassium bromate has a very long history as a wheat flour treatment agent. Potassium bromate was used in the American baking industry in 1914. Since then, potassium bromate has been widely used as a baking improver and was once considered one of the best dough conditioners. Potassium bromate can inhibit the activity of proteolytic enzymes in flour, thereby improving the strength, extensibility, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 杨冰仪王梅邹志辉李彦君许扬婕杨晓英
Owner GUANGDONG PHARMA UNIV
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