Two: In the measurement of high-purity water should avoid contamination, the correct choice of constant conductivity electrode and the best use of sealed, flow measurement. Otherwise, its conductivity will increase rapidly. This is because after the carbon dioxide in the air dissolves into the high-purity water, it becomes a carbonate ion with conductive properties and affects the measurement value.
Three: In order to ensure the measurement accuracy, the electrode should be washed twice with deionized water (or distilled water) with a volume of 0.5μS/cm before use, and then it can be measured after flushing with the sample to be tested.
Four: The electrode plug seat prevents moisture, so as to avoid unnecessary measurement errors.
Five: The value displayed after the conductivity meter measurement has been converted to the conductance value of 25°C. If there is no need to compensate, pull out the temperature electrode instrument to display 25 °C, the measured value is the conductance value of the solution at that time.
Based on the following three points, the Iron Box can better protect the tea packaging and protect the tea.
1. Tightness of the iron box.
Tea will deteriorate when exposed to the air, so the first key to storing tea is to seal it. The iron box has a low oxygen permeability, which has a good barrier to the air and can better protect tea.
2. Reducibility of iron box.
Chemical action of the iron box: good reducibility, the tin in the iron box will react with the oxygen remaining in the container during filling, which is the reduction of tin. The reduction of tin can reduce the chance of oxidation of tea nutrients and prolong the storage life of tea
3. Light opacity of iron box
Light is easy to cause deterioration reaction of tea and change of food quality, especially green tea is easy to deteriorate in case of light. The lightproof of the iron box makes the preservation rate of tea higher. In addition to keeping the original flavor of tea, even the color will not change.
For the current market, iron box packaging is widely used, such as tea iron boxes. Due to the diversity of printing on the surface of the iron box and good gloss, it is more beautiful and high-grade. The reason why people like to use iron boxes for packaging is that the compatibility strength of iron boxes is good and they are suitable for preservation. In recent years, there are all kinds of packaging materials on the market. From wooden boxes, plastic boxes to iron boxes, among which iron boxes are the first choice for tea packaging.
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Dongguan Tielangtou Hardware Products Co., Ltd , https://www.tlthardware.com