AR (Analytical reagent); Biochemical reagent BC(Biochemical reagent); BP (British Pharmacopoeia); BR (Biological reagent); BS (Biological Stain); CP (Chemical pure); CP (Chemical pure); EP (Extra Pure); FCM (For Complexometry); FCP (For chromatography purpose); FMP (For microscopic purpose); FS (For synthesis); Gas chromatography (GC); GR (Guaranteed reagent Pure); HPLC (High Preussuer Liquid chromatography); Ind (Indicator); LR (Laboratory reagent); OSA (Organic analyfical standard); PA (Pro analysis); Pract (Practical use); PT (Primary eragent reference reagent); Pur (Pure purum); Puriss (Purissmum); SP (Spectrum pure); Tech (Techincal grade industrial); TLC (Thin Layer chromatography); UV (Ultra violet pure, optical pure, violet pure)
The following details:
| Purity grade | Superpure | Analytically pure | Chemically pure | Experimental reagent |
| English code | G．R． | A．R． | C．P． | L．R． |
| Guarantee Reagent | Analytical Reagent | Chemical Pure | Laboratory Reagent | |
| Label color | green | red | blue | yellow |
| Scope of application | As a reference material, it is mainly used in precise scientific research and analytical experiments. | For general scientific research and analytical experiments. | For more demanding inorganic and organic chemistry experiments, or less demanding analytical tests. | It is used for general experiments and scientific experiments with low requirements |
Reagent specifications in China are basically divided according to purity (how much impurity content), a total of 7 kinds of high purity, spectral pure, benchmark, spectral pure, excellent grade pure, analytical and chemical pure. The state and the competent authorities have promulgated three main quality indicators, namely, excellent grade pure, graded pure and chemical pure.
(1) GR: Guaranteed reagent, also known as a grade or guaranteed reagent, 99.8%, this reagent has the highest purity, the lowest impurity content, suitable for important precision analytical work and scientific research work, the use of green bottle tag.
(2) Analytical pure (AR), also known as secondary reagent, high purity, 99.7%, slightly lower than the optimal grade pure, suitable for important analysis and general research work, the use of red bottle tag.
(3) Chemical pure (CP), also known as tertiary reagent, ≥ 99.5%, purity and analytical pure difference is large, suitable for industrial and mining, school general analytical work. Use the blue (dark blue) label.
(4) Experimental reagent (LR: Laboratory reagent), also known as four-grade reagent.
In addition to the above four levels, there are still:
Reference Reagent (PT: Primary Reagent) : specially used as a reference, can be directly prepared standard solution.
Spectrum pure reagent (SP: Spectrum pure) : indicates spectral purity. However, because the organic matter can not be shown on the spectrum, sometimes the principal component can not reach more than 99.9%, and it must be paid attention to when used, especially when it is used as a benchmark, it must be calibrated.
Reagents with a purity much higher than that of superior purity are called high-purity reagents (≥ 99.99%). High purity reagent is developed on the basis of general reagents, and it is the reagent with the highest purity produced by special methods for special use purposes. Its impurity content is 2, 3, 4 or more orders of magnitude lower than the superior grade reagent. Therefore, high-purity reagents are particularly suitable for some trace analysis, and the usual high-grade pure reagents do not meet the requirements of such precision analysis. At present, in addition to the development of national standards for a few products (such as high-purity boric acid, high-purity ice acetic acid, high-purity hydrofluoric acid, etc.), the quality standards of most high-purity reagents are still very inconsistent, and there are different names in the name of high-purity, Extra Pure, ultra-pure, spectral pure, etc. According to the different scope of high-purity reagent industry, it can be divided into the following types:
(1) High purity chemicals for optics and electronics, that is, electronic grade reagents (EIectronicgrade) reagents.
(2) Metal-Oxide-Semiconductor (metal-oxide-Semiconductor) high-purity chemicals for the electronics industry, that is, UP-S grade or MOS reagent (read: Morse reagent). Generally used in semiconductors, electronic tubes, etc., the highest content of impurities is 0.01-10ppm, some can be reduced to the order of ppb, the metal impurity content is less than 1ppb, the dust level reaches 0-2ppb, suitable for 0.35-0.8 micron integrated circuit processing technology.
(3) High-purity chemicals for single crystal production.
(4) High-purity chemicals for optical fibers.
In addition, there are instrument separation reagents, ultra-pure reagents (impurity content less than 1/1000000 ~ 1/1000000000), special high-purity organic materials.
(5) Plasma Mass spectrometry Pure Grade reagent (ICP-MASS Pure Grade) : most impurity elements content is less than 0.1ppb, suitable for plasma Mass spectrometer (ICP MASS) daily analysis work.
(6) Plasma emission spectrum Pure Grade reagent (ICP Pure Grade) : most impurity elements content is less than 1ppb, suitable for plasma emission spectrometer (ICP) daily analysis work.
(7) Atomic absorption spectroscopy Pure Grade reagent (AA Pure Grade): the vast majority of impurity elements content is less than 10 ppb, suitable for atomic absorption spectrometer (AA) daily analysis work.
At present, the specifications of chemical reagents produced by foreign reagent factories tend to be divided by use, and the common ones are as follows:
Biochemical reagent (BC: Biochemical)
Biological reagent (BR: Biological reagent)
Biological Stain (BS: Biological Stain)
For Complexometry (FCM)
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Fluorescence Analysis (FIA)
Microbial (FMB)
FMP (For microscopic purpose)
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High Pressure Liquid chromatography (HPLC)
indicator _9t Analytical Chemistry, Forum, Chemical Analysis, Instrumental Analysis, Analytical Testing, Chromatography, electrophoresis, spectroscopy (Ind: Indicator)
Infrared absorption (IR)
Liquid chromatography (LC)
Nuclear magnetic resonance (NMR)
Organic analytical standard 6a1Z2m:d*A7K+x Analytical Chemistry Forum (OSA: Organic analytical standard)
For analysis (PA: Pro analysis)
Pract (Practical use)
(\(T&e-Y5G-N%MPur (Pure purum)
Puriss (Purissmum)
Synthesis (SYN)
Industrial Tech: Techincal grade)
Thin Layer chromatography (TLC)
UV: Ultra violet pure $v7)(UV: Ultra violet pure)
For example, the nitric acid produced by the German company Imerk has 13 specifications: The minimum concentration of the ultra-pure reagent is 65% (density about 1.40). The minimum concentration passed by the test is 65% (density about 1.40). The maximum concentration of Hg is 0.0000005%) of the guaranteed reagent (GR) nitric acid, the minimum concentration of the dithizone test is 65% (density about 1.40) of the guaranteed reagent (GR) nitric acid, the minimum concentration of 65% (density about 1.40) of the optical and electronics special pure (Selectipur) nitric acid, 100% (density about 1. 52) guaranteed reagent (GR) nitric acid, 100% (density about, 1.42) optical and electronics special pure (Seletipur) fuming nitric acid, dehydrogen degree less than 99% of the dehydrogen reagent nitric acid -di(in D2O, Not less than 65%DNO3), 0.1mo1/L nitric acid solution for titration and 1mo1/L nitric acid solution for titration. Imerk also produces reagents of various specifications according to the needs of users, such as biochemical reagents, Merck diagnostic reagents, medical research, agricultural and environmental monitoring reagents, and so on.
The advantages of reagent specifications divided by use are simple and clear, and the use of this reagent can be known from the specifications, and the user does not have to consider repeatedly which purity grade and reagent to use.
Appendix: Foreign reagent purity level description
Ultra Pure: Ultra pure, similar to the GR level.
High Purity: High purity, similar to AR grade.
Biotech: Biotechnology grade, similar to BR grade.
Reagent: Reagent grade, similar to CP grade.
ACS: American Chemical Society standard, similar to AR class.
USP: Pharmaceutical grade