Detailed description of chemical reagent specifications Reagent specifications are also called reagent levels or categories. At present, except for the development of national standards for a few products, the quality standards of most high-purity reagent ELISA kits are still not uniform. There are high-purity and ultra-pure in the name , Ultra-pure, spectrally pure, etc. High-purity reagents are developed on the basis of general-purpose reagents. It is the reagent with the highest purity produced by a special method for special use purposes. For example, the nitric acid produced by the German Imerk company has 13 specifications: the minimum concentration of 65% (density about 1.40) of the ultra-pure reagent dithizone nitrate test passed the minimum concentration of 65% (density of about 1.40 Hg maximum concentration 0.0000005% ) Guaranteed reagent (GR) nitric acid, dithizone test passed the minimum concentration of 65% (density of about 1.40) Guaranteed reagent (GR) nitric acid, the minimum concentration of 65% (density of about 1.40) for optical and electronic special Pure (Selectipur) nitric acid, 100% (density about 1.52) guarantee reagent (GR) nitric acid, 100% (density about, 1.42) optical and electronic special pure (Seletipur) fuming nitric acid, heavy hydrogen degree less than 99% The heavy hydrogen 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.
Excellent grade pure is also called first grade product. This reagent has the highest purity and the lowest impurity content. It is suitable for important precision analysis work and scientific research work with green bottle label. Metal-oxide-semiconductor (Metal-Oxide-Semiconductor) special high-purity chemicals for the electronics industry, namely MOS reagent (pronounced: Morse reagent). The specifications of China's reagent ELISA kits are basically divided by purity. There are 7 types of high purity, spectral purity, benchmark, spectroscopic purity, superior purity, analytical and chemical purity. Analytical purity is also called second-grade product, and its purity is very high, slightly lower than that of superior-grade purity. It is suitable for important analysis and general research work. It uses red bottle labels. Its impurity content is 2, 3, 4 or more orders of magnitude lower than the superior reagent. Chemical purity is also called third grade product. The purity and analytical purity are quite different. It is suitable for general analysis in industry, mines and schools.
Generally used in semiconductors, electron tubes, etc., the maximum content of impurities is 0.01-10ppm, and some can be reduced to the order of ppb. Therefore, high-purity reagents are particularly suitable for some trace analysis, and the high-grade pure reagents usually found in ELISA kits can not meet the requirements of such precise analysis. The advantages of reagent specifications divided by use are simple and clear. From the specifications, the purpose of this reagent can be known, and the user does not have to repeatedly consider which purity level and reagent to use. In addition, there are instrumentation reagents, ultra-pure reagents (impurity content less than 1/1000000 to 1/1000000000), special high-purity organic materials, etc. Generally, the specifications are divided according to the actual use or purity and impurity content. The state and the competent authority have promulgated three main types of quality indicators: superior grade, graded grade, and chemical grade. At present, the specifications of chemical reagents produced by foreign ELISA kit factories tend to be divided by use.
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