What does reagent ar mean? chemistry
Reagent specifications are also known as reagent grades or categories. Specifications are generally divided according to actual uses or purity and impurity content. At present, the specifications of chemical reagents produced by foreign reagent factories tend to be divided by use. So what does reagent ar mean?
Analytical purity (AR) is the purity specification of chemical reagents and belongs to the second grade. The analytical purity label is golden red, which is used for general analytical tests (preparation of ordinary test solutions in quantitative analysis); analytical purity (AR, red label) (second grade): high content of main components, high purity, low interference impurities, suitable for industrial analysis and chemical experiments.
The specifications of chemical reagents in our country are basically divided according to the purity (the amount of impurity content), and there are 7 kinds of high purity, spectral purity, benchmark, spectroscopic purity, excellent purity, analytical and chemical purity. There are three main types of excellent purity, graded purity and chemical purity promulgated by the state and the competent authorities.
(1) Excellent grade purity (GR: Guaranteed reagent), also known as first-grade or guaranteed reagent, 99.8%, this reagent has the highest purity and the lowest impurity content, suitable for important and precise analytical work and scientific research work, using green bottle labels.
(2) Analytical purity (AR), also known as secondary reagent, is very high in purity, 99.7%, slightly inferior to excellent purity, suitable for important analysis and general research work, using a red bottle label.
(3) Chemical purity (CP), also known as tertiary reagent, ≥ 99.5%, the purity is quite different from the analytical purity, and it is suitable for general analytical work in industries, mines and schools. Use blue (dark blue) labels.
(4) Laboratory reagents (LR), also known as four-level reagents.
