Primary standards is of high purity, less impurity, good stability, chemical composition constant. Capacity analysis, the reference reagent in determination of pH in determination of calorific value, and so on. Have the first reference and classification standard of each classification. Where the first reference must be made by the National Institute of metrology verification. The production units used as the first reference standard benchmark products. At present, reference reagent business mainly refers to the capacity analysis in capacity analysis of benchmark [content range 99.95%~100.05% (gravimetric titration). Generally used to calibrate the titrant.
Analysis of organic reagent is determined for inorganic elements in the separation and analysis of precipitant for enrichment, extraction agent, chelating agent and indicator for organic compounds, and not to refer to the general solvent, organic acid and organic alkali. These organic reagents must have good sensitivity and selectivity. With the development of analytical chemistry and the chemical industry, will be developed this kind of reagent sensitivity and better selectivity, such as since 1967 for some metal (such as alkali metal, alkaline earth metal) crown ether compounds and ammonium ion complexing is such.
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