According to the quality index, there are three main grades: pure grade, graded grade and chemical grade.

(1) Excellent grade pure (GR: Guaranteed reagent), also known as first-class product or guaranteed reagent, 99.8%, this reagent has the highest purity and the lowest impurity content, suitable for important precision analysis work and scientific research work, using green bottle label .

(2) Analytical purity (AR), also known as secondary reagent, has a very high purity of 99.7%, slightly inferior to superior purity, suitable for important analysis and general research work, using a red bottle label.

(3) Chemically pure (CP), also known as tertiary reagent, ≥99.5%, the purity and analytical purity are quite different, suitable for industrial and mining, school general analysis work. Use the blue (dark blue) label.

(4) Laboratory reagent (LR: Laboratoryreagent), also known as the fourth grade reagent. In addition to the above four levels, there are currently on the market: benchmark reagent (PT: PrimaryReagent): specifically used as a benchmark, can be directly prepared standard solution. Spectral pure reagent (SP: Spectrumpure): indicates spectral purity. However, because the organic substance does not show up in the spectrum, sometimes the main component is less than 99.9%, and it must be noted when using it, especially when it is used as a reference substance, it must be calibrated. Reagents whose purity is much higher than that of superior-grade pure are called high-purity reagents (≥99.99%).

Reagent access rules

The solid powder reagent can be taken with a clean horn spoon. When you want to take a certain amount of solid, you can put the solid on paper or watch glass and weigh it on the platform scale. For accurate weighing, use a weighing bottle to weigh on the balance. The liquid reagent is usually measured with a measuring cylinder. The volume of the measuring cylinder is 5mL, 10mL, 50mL, 500mL and so on. When using it, the measured liquid should be injected into the measuring cylinder to keep the line of sight and the lowest part of the liquid concave surface in the measuring cylinder horizontal, and then read The scale on the graduated cylinder gives the volume of liquid.

If a small amount of liquid reagent is needed for the high-frequency infrared carbon-sulfur analyzer, it can be taken with a dropper. When taking it, be careful not to touch or insert the dropper on the wall or inside of the receiving container.

In order to achieve accurate experimental results, the following rules should be followed when taking reagents to ensure that the reagents are not contaminated and not deteriorated: (1) The reagents must not come into contact with hands. (2) Use a clean medicine spoon, measuring cylinder or dropper to take the reagents. It is absolutely forbidden to use the same tool to continuously take multiple reagents at the same time. After taking one reagent, the tool should be washed (the medicine spoon should be dried) before taking another reagent.

(3) After taking the reagent, the cap must be tightly closed. The cap and the dropper must not be misplaced. Zhang Guanli Dai is never allowed to put the bottle back in place after use.

(4) The removed reagents can no longer be put back in the original reagent bottles.

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