Editor's note: Reagent specifications are basically divided by purity (how much impurity content). There are 7 types of high-purity reagents, spectrally pure reagents, reference reagents, spectroscopically pure reagents, superior-grade pure reagents, analytical reagents and chemically pure reagents. The state and the competent authority have promulgated three main types of quality indicators: superior 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 still:
Reference reagent (PT: PrimaryReagent): It is specially used as a reference substance, and a standard solution can be directly prepared.
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 used, especially when used as a reference substance, calibration must be performed.
Reagents whose purity is much higher than that of superior-grade pure are called high-purity reagents (≥99.99%).
At present, the specifications of chemical reagents produced by foreign reagent factories tend to be divided according to usage, the common ones are as follows:
Biochemical reagents (BC: Biochemical)
Biological reagent (BR: Biologicalreagent)
Biological stain (BS: BiologicalStain)
For complex titration (FCM: ForComplexometry)
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